WO2004049358A2

WO2004049358A2 - Multifunctional particulate material, fluid, and composition

Info

Publication number: WO2004049358A2
Application number: PCT/US2003/016230
Authority: WO
Inventors: Tirumalai S. Sudarshan; Sanjay Kotha; Ramachandran Radhakrishnan
Original assignee: Materials Modification, Inc.
Priority date: 2002-11-25
Filing date: 2003-06-25
Publication date: 2004-06-10
Also published as: US20040105980A1; WO2004049358A3; CA2473450C; AU2003259026B9; AU2003259026A1; US7560160B2; AU2003259026B2; AU2003259026B8; CA2473450A1

Abstract

A multifunctional particulate material, fluid, or composition includes a predetermined amount of core particles with a plurality of coatings. The core particles have an average particle size of about 1 nm to 500 µm. The particulate material, fluid, or composition is capable of exhibiting one or more properties, such as magnetic, thermal, optical, electrical, biological, chemical, lubrication, and rheological.

Description

MULTIFUNCTIONAL PARTICULATE MATERIAL, FLUID, AND COMPOSITION

TIRUMALAI S. SUDARSHAN, PH.D.

SANJAY KOTHA

RAMACHANDRAN RADHAKRISHNAN, PH.D.

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] The present application is related to pending U.S. Application S.N. 10/157,921 , filed May 31 , 2002, and which is incorporated herein in its entirety by reference.

BACKGROUND OF THE INVENTION

[0002] The present invention is generally directed to a particulate material, and more particularly to a multifunctional particulate material, composition, and fluid capable of exhibiting one or more properties, such as magnetic, thermal, optical, electrical, biological, lubrication and Theological. [0003] Dispersions of particles in fluids, termed as functional fluids, exhibit controllable property changes with an application of either one or a combination of electrical, thermal, optical or magnetic impulses. The prominent examples from the art, include thermal heat transfer fluids, magnetorheological (MR) fluids and electrorheological (ER) fluids. ER and MR fluids are known to exhibit changes in rheological behavior in the presence of an electrical and magnetic field, respectively, making them useful in a wide spectrum of applications, such as brakes, clutches, dampers and many others. However, if these fluids could exhibit more than one functionality, their performance and life would increase many-folds. For example, if MR fluids, in addition to rheological control, have a thermal tunablity, the life of the device, which is adversely affected by the dissipated heat, can be significantly increased. Such multifunctional fluids are not known to exist presently.

[0004] Various examples of prior art in this area include U.S

Patents 3,047,507; 3,937,839; 4,064,409; 4,106,488; 4,107,288; 4,183,156

4,219,945 4,267,234; 4,268,413; 4,303,636; 4,323,056; 4,340,626 4,342,157 4,443,430; 4,452,773; 4,454,234; 4,472,890; 4,501 ,726 4,545,368 4,554,088; 4,574,782; 4,613,304; 4,628,037; 4,637,394 4,662,359 4,672,040; 4,695,392; 4,695,393; 4,721 ,618; 4,992,190 4,999,188 5,067,952; 5,108,359; 5,161 ,776; 5,180,583; 5,202,352 5,207,675 5,236,410; 5,354,488; 5,358,659; 5,374,246; 5,427,767 5,466,609 5,493,792; 5,507,744; 5,525,249; 5,565,215; 5,582,425 5,595,735 5,597,531 ; 5,624,685; 5,635,162; 5,635,215; 5,645,849 5,646,185; 5,667,715; 5,670,078; 5,695,480; 5,702,630; 5,707,078 5,714,829; 5,782,954; 5,800,372; 5,900,184; 5,927,753; 5,947,514 6,027,664; 6,036,226; 6,036,955; 6,039,347; 6,044,866; 6,051 ,607 6,076,852; 6,096,021 ; 6,149,576; 6,149,832; 6,167,313; 6,186,176 B1 6,189,538 B1 ; 6,266,897 B1 ; 6,274,121 B1 ; 6,299,619 B1 ; 6,315,709 B1 6,335,384 B1 ; 6,355,275 B1 ; 6,399,317 B1 6,409,851 B1 ; US 2001/0016210 A1 ; US 2001/0033384 and US 2002/0045045 A1 ; and.

OBJECTS AND SUMMARY OF THE INVENTION

[0005] The principal object of the present invention is to provide a particulate material that is capable of exhibiting multifunctional properties.

[0006] An object of the present invention is to provide a particulate composition that is capable of exhibiting multifunctional properties.

[0007] Another object of the present invention is to provide a fluid that is capable of exhibiting multifunctional properties. In particular, a fluid in accordance with the present invention is capable of exhibiting one or more properties, such as magnetic, thermal, optical, electrical, biological, chemical, lubrication, rheological, etc.

[0008] An additional object of the present invention is to provide a fluid that is sensitive to one or more stimuli or fields, such as magnetic, thermal, optical, electrical, etc. [0009] Yet an additional object of the present invention is to provide a particulate material, a composition, a fluid, and/or an article including one or more of the same, which is capable of exhibiting substantially simultaneous variations in one or more of its properties when subjected to one or more stimuli, such as magnetic, thermal, optical, electrical, etc.

[0010] Still yet an additional object of the present invention is to provide a particulate material, a composition, a fluid, and/or an article including one or more of the same, wherein multifunctional properties are preferably derived from the core particles, one or more coatings, and the carrier medium.

[0011] In summary, the main object of the present invention is to provide a fluid which includes single or multilayered coated particles of one or more compositions in a suitable carrier medium. The particles, coatings and the carrier medium, preferably include non-interacting compositions. The fluid exhibits a novel multifunctional behavior. A fluid possesses multifunctionality when it exhibits two or more properties. A wide variety of processes are adopted to (1) synthesize the particles in various sizes (about 1nm to 500 μm), shapes (spherical, needle-like, etc.), and composition (iron and its oxides, cobalt, nickel, etc.), (2) apply a coating of a variable thickness (about

1 nm to 10 μm) and/or in multilayers (1 to 10 or more layers), and (3) dispersing the coated particles in a medium (aqueous, oils, and the like). The main properties attained by the present invention include magnetic, optical, thermal, electrical, rheological, lubrication, and biological, in various combinations. The properties of the fluid can be easily tuned by either altering the material properties, or the proportion of applied stimuli. Table 1 (below) lists various tunable parameters for the fluid of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The above and other objects, novel features and advantages of the present invention will become apparent from the following detailed description of the invention, as illustrated in the drawings, in which:

[0013] Figure 1 is a schematic illustration of various shapes for the core particles in accordance with the present invention;

[0014] Figure 2 is an enlarged cross-sectional view of an embodiment of a multifunctional particle in accordance with the present invention;

[0015] Figure 3 is an enlarged cross-sectional view of a multifunctional particle with two layers of generally the same thickness;

[0016] Figure 4 is a view similar to Figure 3, showing a multifunctional particle with two layers of different thicknesses;

[0017] Figure 5 is a schematic view showing a multifunctional fluid; [0018] Figure 6 is a schematic illustration of magneto-responsive functional particles showing a change in viscosity upon application of a magnetic field;

[0019] Figure 7 is a schematic illustration of a magneto-optic functional fluid showing a change in turbidity upon application of a magnetic field;

[0020] Figure 8 is a schematic illustration of magneto-responsive functional particles showing an increase in electrical pathway;

[0021] Figure 9 is a schematic illustration of a magneto- responsive functional fluid showing controlling or arresting internal hemorrhage;

[0022] Figure 10 is a schematic illustration of a magneto- responsive functional fluid showing inhibiting angiogenesis;

[0023] Figure 11 is a schematic illustration of an optical fluid showing a change in transparency upon application of light intensity;

[0024] Figure 12 is a schematic illustration of an electro-optical functional fluid showing a change in transparency with increasing electric field;

[0025] Figure 13 is a schematic illustration of a thermo-optical functional fluid showing a change in color due to a change in temperature; [0026] Figure 14 is a schematic illustration of an optical fluid showing a change in color with the application of a chemical or biological stimulus;

[0027] Figure 15 is a schematic illustration of an electro- responsive functional fluid showing a change in viscosity upon application of an electric field; and

[0028] Figure 16 is a schematic illustration of a functional fluid wherein a pre-ceramic polymer coating on a core particle becomes ceramic when heat is applied.

DETAILED DESCRIPTION OF THE INVENTION

[0029] A multifunctional fluid, in accordance with the present invention, is capable of exhibiting substantially simultaneous variations in one or more of its properties, when subjected to one or more specific stimuli. The multifunctional fluid includes one or more core particles with one or more coatings, dispersed in a suitable carrier medium. While the overall properties of the fluid are generally dictated by all three components, the core particles contribute the main desirable property, while the coatings and the carrier medium adds various other variable functionalities. [0030] The core particles that are the subject of the present invention can be synthesized by various methods, such as chemical synthesis, sol-gel, chemical co-precipitation and rapid solidification. The microwave plasma technique, described in U.S. Patent No. 6,409,851 , issued June 25, 2002 (incorporated herein in its entirety by reference) is the preferred technique as it can make a wide spectrum of particles with high purity. The properties of the particle, including electrical, thermal, magnetic or optical, vary significantly with the size of the particle. Tailoring the size of the particle can be used as a tool to effect required changes in the system.

[0031] The functional fluid of the present invention, includes core particles, preferably having an average particle size of about 1 nm to 500 μm. Other parameters, as listed below in Table 1 , influence the desired functionality of the final fluid, and can be controlled by optimizing the synthesis process. For example, as the shape of the particle changes, so does the active surface area and the filled-up volume.

Table 1 : List of Tunable Material Properties

[0032] The particles can be made of metal, polymer, ceramic material, intermetallic material, alloy, or a combination thereof. Preferable examples of the metal include iron, cobalt, nickel, copper, gold, silver, chromium, tungsten, silicon, aluminum, zinc, magnesium, titanium, molybdenum, tin, vanadium, germanium, zirconium, niobium, rhenium, iridium, cadmium, indium, hafnium, tantalum, platinum, neodymium, gallium, zinc, and a combination thereof. Preferable examples of the polymer include polystyrene, polymethyl methacrylate, polyvinyl alcohol, polyphenylene vinylene, and a combination thereof. Preferable examples of the ceramic material include iron oxide, zinc ferrite, manganese ferrite, zinc oxide, aluminum oxide, silicon dioxide, silicon carbide, boron carbide, carbon and its types, indium oxide, titania, aluminum nitride, zirconia, tin oxide, chromium oxide, yttrium oxide, niobium oxide, hafnium oxide, tantalum oxide, tungsten oxide, magnesium oxide, boron nitride, silicon nitride, hafnium nitride, tantalum nitride, tungsten nitride, iron nitride, vanadium nitride, titanium, silicon carbide, chromium carbide, vanadium carbide, titanium carbide, iron carbide, zirconium carbide, niobium carbide, hafnium carbide, tungsten carbide, tantalum carbide, titanium diboride, vanadium boride, iron boride, zirconium diboride, hafnium diboride, tantalum diboride, nickel boride, cobalt boride, chromium boride, and a combination thereof. Preferable examples of the intermetallic material include titanium aluminide, niobium aluminide, iron aluminide, nickel aluminide, ruthenium aluminide, iridium aluminide, chromium aluminide, titanium suicide, niobium suicide, zirconium suicide, molybdenum suicide, hafnium suicide, tantalum suicide, tungsten suicide, iron suicide, cobalt suicide, nickel suicide, magnesium suicide, yttrium suicide, cadmium suicide, berryllium oxide, nickel berryllide, niobium berryllide, tantalum berryllide, yttrium berryllide, tantalum berryllide, zirconium berryllide, and a combination thereof. Preferable examples of the alloy include indium tin oxide, cadmium selenide, iron-cobalt, ferro-nickel, ferro-silicon, ferro-manganese, ferro- magnesium, brass, bronze, steel, a combination of two or more of the aforementioned metals, and a combination thereof.

[0033] Preferable examples of the shape of the particles, utilized in the present invention, include spherical, needle-shaped, cubic, oval, irregular, cylindrical, diamond-shaped, lamellar, polyhedral, and a combination thereof (Figure 1).

[0034] The present invention involves uniformly coating particles

(noted above) with adherent layers of one or more materials, either in the gas or the liquid phase using techniques, such as sol-gel, chemical precipitation, chemical vapor deposition, plasma vapor deposition, gas phase condensation, evaporation and sublimation. During the gas phase process, the precursors or starting materials for synthesizing particles, as well as the coating material (in liquid or molten form) are subjected to high thermal energy. The uniformity and extent of coating(s) are controlled by varying operating parameters, such as temperature, feeding rate and proportions (of the starting materials or precursors), and the pressure of the process. The

π number of coated layers will depend simply on the feed composition and their concentration. One of the important advantages of the gas phase coating process is that it does not allow any gases or static charges to get adsorbed on the particle surface, thereby maintaining phase purity.

[0035] The liquid phase process is typically a chemical synthesis route in which the coating is established by reduction of the precursor (or starting material) while the favorable reaction site is the surface of the particles. In contrast to the gas phase reaction, this technique proves useful only in materials, which readily undergo reduction in a solution phase. Inert species, such as gold or silver, and gel forming polymers, such as polyethylene glycol and dextran, are a few examples. One of the primary advantages of this technique is that coating is established in stages, which gives precise control over the coating thickness and uniformity of layers in a multilayered system.

[0036] In the case of polymer coating, the solution route may be similar to a core-shell polymerization while the gas phase would relate to a thermally assisted free radical polymerization reaction. The type of polymer (hydrophilic, i.e., water-loving, or hydrophobic, i.e., insoluble in water) would decide the nature of carrier fluid, such as water, oil, or the like, in which these coated particles can be effectively dispersed.

[0037] Preferably, one to ten coatings are provided, and each has a thickness range of about 1 nm to 500 μm, and preferably 1 nm to 10 μm. The coatings can have generally the same or varying thicknesses. It is noted that it is within the scope of the present invention to provide more than ten coatings of a different range of thickness.

[0038] The coating can be made of metal, polymer, ceramic material, intermetallic material, alloy, or a combination thereof. Preferable examples of the metal include iron, cobalt, nickel, copper, gold, silver, chromium, tungsten, silicon, aluminum, zinc, magnesium, titanium, molybdenum, tin, indium, bismuth, vanadium, magnesium, germanium, zirconium, niobium, rhenium, iridium, cadmium, indium, hafnium, tantalum, platinum, neodymium, gallium, zinc, and a combination thereof. Preferable examples of the polymer include polyethylene glycol, sorbitol, manitol, starch, dextran, polymethyl methacrylate, polyaniline, polystyrene, poly pyrolle, N- isopropyl acrylamide, acrylamide, lecithin, and a combination thereof. Preferable examples of the ceramic material include iron oxide, zinc ferrite, manganese ferrite, zinc oxide, aluminum oxide, silicon dioxide, silicon carbide, boron carbide, carbon and its types, indium oxide, titania, aluminum nitride, zirconia, tin oxide, chromium oxide, yttrium oxide, niobium oxide, hafnium oxide, tantalum oxide, tungsten oxide, magnesium oxide, boron nitride, silicon nitride, hafnium nitride, tantalum nitride, tungsten nitride, iron nitride, vanadium nitride, titanium, silicon carbide, chromium carbide, vanadium carbide, titanium carbide, iron carbide, zirconium carbide, niobium carbide, hafnium carbide, tungsten carbide, tantalum carbide, titanium diboride, vanadium boride, iron boride, zirconium diboride, hafnium diboride, tantalum diboride, nickel boride, cobalt boride, chromium boride, and a combination thereof. Preferable examples of the intermetallic material include titanium aluminide, niobium aluminide, iron aluminide, nickel aluminide, ruthenium aluminide, iridium aluminide, chromium aluminide, titanium silicide, niobium silicide, zirconium silicide, molybdenum silicide, hafnium silicide, tantalum silicide, tungsten silicide, iron silicide, cobalt silicide, nickel silicide, magnesium silicide, yttrium silicide, cadmium silicide, berryllium oxide, nickel berryllide, niobium berryllide, tantalum berryllide, yttrium berryllide, tantalum berryllide, zirconium berryllide, and a combination thereof. Preferable examples of the alloy include indium tin oxide, cadmium selenide, iron-cobalt, ferro-nickel, ferro-silicon, ferro-manganese, ferro-magnesium, brass, bronze, steel, a combination of two or more of the aforementioned metals, and a combination thereof.

[0039] The final property of the fluid will preferably depend upon the nature and type of carrier medium. In one embodiment, water alone can be used. However, water miscible organic solvents, such as ethanol, glycerol, ethylene glycol, propanol, dimethyl formamide, and the like can be used. Water-based carrier fluids may also be used in various biological applications, such as imaging or drug targeting. In another embodiment, wherein the application requires higher viscosity, oil may be used. The coated particle, when dispersed in a high viscosity fluid, would reduce their natural Brownian motion, thereby rendering a higher level of stability to the system. [0040] A non-limiting example of the carrier fluid that may be used in the present invention, includes water, mineral oil, hydraulic oil, silicone oil, vegetable oil (corn oil, peanut oil and the like), ethanol, glycerol, ethylene glycol, propanol, dimethyl formamide, paraffin wax, and a combination thereof.

[0041] The particles and their respective coatings essentially define the properties for the entire fluid. However, properties, such as optical, thermal or magnetic, are all dependent upon the force distribution between the particles, which is closely related to the interparticle distance. In general, microscopic properties are strongly affected by the force fields and the interracial contact area. In order to get superior functionality, it is preferred that the particles do not agglomerate. The present invention therefore utilizes a dispersant (or surfactant) stabilized system, wherein the agent assists the particles in remaining dispersed and reduces their tendency to get settled. Preferable examples of surfactants include: dextran, starch, lecithin, glycol, glycerol, sorbitol, manitol, oleic acid, polyethylene glycol, and a combination thereof.

[0042] Figures 2-4 illustrate an embodiment of a multifunctional particle MFP made in accordance with the present invention. As shown in Figure 2, a core particle 10, made of a magnetic material (iron), is provided with three layers 12, 14 and 16 of optically-sensitive (gold), heat-absorbing (copper), and electrically-conductive (silica) materials, respectively. Figure 3 illustrates a multifunctional particle MFP, which includes a core particle 18 provided with two layers 20 and 22 of the same thickness, and Figure 4 illustrates a multifunctional particle MFP, which includes a core particle 24 provided with two layers 26 and 28 of different thicknesses.

[0043] Figure 5 illustrates a fluid wherein multifunctional particles

MFP, each including a core particle 30 with two layers 32 and 34, are dispersed in a suitable carrier medium 36 to form a multifunctional fluid or composition.

[0044] The present invention provides fluids which can exhibit multifunctional characteristics. These include optical, magnetic, thermal, electrical, rheological and biological properties that can be controlled (or altered) by one or more external stimuli. The core particle represents the main properties, while the coatings and the carrier medium contribute to other accompanying functionalities. The fluid according to the present invention, preferably contains all the components, which are non-interactive and the properties do not interact with each other.

[0045] The following embodiments illustrate non-limiting examples of various types of fluids prepared in accordance of the present invention. Magneto-Responsive Functional Fluids

[0046] Magnetic particles, preferably of Fe, Co, Ni, Fe₂O₃ or ferrites (about 2% to 90 vol% concentrations, i.e., about 2 to 90 vol% of the fluid is comprised of the magnetic particles, dispersed in various media, such as water, mineral oil, glycerol, elastomers, polymeric liquids, organic solvents and the like, exhibit a change in viscosity upon interaction with a magnetic field (Figure 6). The change in rheology can be controlled by intrinsically altering the magnetic properties of the particles or by variation in the magnitude of the external magnetic field. The magnetic properties, such as magnetic saturation and coercivity, of the particles are dependent upon the shape and size of the particle, which can be precisely controlled and varied in the present invention (see Tables 2 and 3 below). In some applications that demand variable rheological behavior or gradient, the use of a mixture of particles, such as a mixture of iron and cobalt, mixture of iron and samarium- cobalt alloy, with different magnetic moments is preferred over a single component fluid.

[0047] One example is coating of magnetic particles with thermally conducting metal, such as copper, aluminum, silica, aluminum oxide, and tungsten. This can be introduced via a conventionally known reverse miceller procedure, wherein the coating is established in a solution phase. The thermal coating would absorb any heat, which may have been generated due to the motion of particles in the medium. These fluids are useful in all mechanical applications of magnetic fluid technology, such as dampers, clutches and shock absorbers.

Table 2: Change in Coercivity with Particle Size

Table 3: Change in Magnetic Saturation with Particle Size

[0048] In another embodiment, magnetic particles are dispersed in an optically clear matrix, such a polymethyl methacrylate (PMMA), polycarbonate, indium oxide, or the like polymer. Optically clear materials in general are transparent to white light and have very low coefficient of absorption. The turbidity (or transparency) would be a function of the loading level of the particles. However, at constant solid's content, the application of magnetic field would align the particles, thereby forming a layered structure (Figure 7). When the distance between the layers is about one-half the order of magnitude of visible light, 400-800 nm, classical Bragg diffraction will result in forbidden bands at typical frequencies. These forbidden states will disappear as soon as the magnetic field is removed and allow light of all wavelengths to pass, thus forming an on-off magnetically controlled optical switch. The size of the particles and their concentration (vol% in the fluid) will determine the maximum dip in intensity, while the distance between the chains of magnetic particles will determine the frequency of the photonic bandgap. Thus, color agile switches can be made. An example is a 500 nm colloidal silica suspension at about 70 % concentration in a titanium oxide matrix.

[0049] In yet another embodiment, coated polymer magnetic particles exhibited sharp magnetic switching effects. This is believed to be due to the dipolar contribution of the polymer that directly influences the inter- particle interactions. Magnetic bistability and switching at low fields obtained in polymer-coated particles would be desirable in systems where the impedance in response to electrical or magnetic stimuli needs to be monitored with high precision. These compositions would therefore be of interest in, for example, RF switching and EMI shielding applications.

[0050] The above-noted fluids can be slightly modified to obtain magnetically controlled conductive composites, wherein magnetic particles, such as ferrites, are doped in conductive polymers, such as polyaniline, or polyphenylene vinylenes (PPV). As the particles are aligned in chains, an increase in electrical pathway is seen (Figure 8). Hence, a magnetically tunable composite fluid can be produced in accordance with the present invention.

[0051] Using the magnetic fluid technology, a biological fluid is produced. This fluid includes biocompatible magnetic particles. The biocompatibility is due of the coating of polymers, such as dextran, starch, polyethylene glycol, sorbitol, or the like. The fluid can be injected inside the body to arrest internal hemorrhage or seal off blood vessels in order to inhibit angiogenesis. The sealing action is a result of a reversible viscosity increase in the presence of an externally positioned magnet.

[0052] As shown in Figure 9, magnetic particles 38, coated with a biocompatible surfactant and/or surface attached with desirable reagent/medicine/drug, are dispersed in a blood vessel 40. The particles 38 are aligned to form a blockage 42 upon application of a magnetic field by magnets 44, thereby arresting hemorrhage 46. [0053] Figure 10 illustrates the use of magnetic particles 38 in inhibiting angiogenesis. As shown, particles 38 are carried through the blood vessel 48 that feeds the target organ 50. The application of a magnetic field by magnets 52 causes agglomeration 54 of the particles carrying the desired drug.

Optical Fluids

[0054] A fluid which exhibits optical multifunctionality is disclosed. This fluid is capable of transmitting visible light at a broad range of temperature range. The optical properties of fluids seem to drastically change as a function of increasing temperature, typically increasing their attenuation. In accordance with the present invention, optically clear ceramic particles, such as ZnO or InO, are coated with a thin layer of copper having a thickness of about 10 nm to 100 nm. The coating thickness is limited by the optical clarity of the fluid. When the fluid is subjected to a temperature increase, all or part of the heat is absorbed by the surrounding copper layer, thereby averting any turbidity that may have been caused due to the input of heat.

[0055] In another embodiment, semiconductor nanocrystals, such as gallium arsenide, silicon carbide, silicon, germanium, cadmium selenide, and a combination thereof, are dispersed in an index matching liquid, such as water, oil, mixture of water and oil, polyethylene glycol, polymethylmethacrylate, polyacrylamide, polystyrene, and a combination thereof. The fluid is subjected to a laser impulse of fixed wavelength. As the intensity of the input laser is increased, the refractive index mismatch increases, thereby lowering the transparency of the medium (Figure 11 ). Hence, the transparency of the medium is a function of the intensity of the incident light source. Changing the size and loading levels of the nanocrystals can be used to tune the optical limiting frequency.

[0056] In yet another embodiment, Cu-coated ceramic particles are dispersed in a conducting matrix. The transparency of this fluid changes from clear (about 100% transmittance) to opaque (0% transmittance), as a function of the varying electric field (OA to 1000A) (Figure 12). These fluids would be desirable in applications such as optical limiters.

[0057] The present invention further discloses luminescent particles of gold and silver, which have a characteristic size on the order of the wavelength of visible light. These particles are embedded in a thermally switchable polymer matrix, such as N-isoproplylacrylamide, polyvinyl alcohol, polyethylene glycol, polyalkelene glycol, and a combination thereof. These polymeric gels possess a lower critical solution temperature of about room temperature. Above and below this temperature, there are significant differences between the excluded free volumes, which change the configuration of the encapsulated particles resulting in change in color (Figure 13). This property could be used in the fabrication of, for example, a temperature sensor. [0058] The embodiment of Figure 13, could be slightly modified to fabricate an optical sensing fluid. Colloidal particles of gold or silver, coated with molecular recognition species, are dispersed in an aqueous or clear organic carrier medium. The interaction of molecules with a chemical or biological stimuli would alter the local configuration of the particles, thereby changing their reflecting color (Figure 14).

Electro-responsive Functional Fluids [0059] An electrically tunable fluid is disclosed. This includes silica particles coated with Cu (about 10 nm to 10 μm thickness) in a dielectric solvent, such as water, mineral oil, polypyrole, polyaniline, ethylene glycol, and a combination thereof. As the electric potential increases, 0-10KV/mm, the rheology (change in viscosity ranging from 1.0 cP to 200,000 cP) of the medium changes. In addition, the electric current increases the thermal energy of the entire system (Figure 15). However, in the fluid of the present invention, the copper coating absorbs all the excess thermal energy produced. Thus, simultaneous rheology and thermal control can be affected. This fluid would be found to be highly useful in applications demanding instantaneous change in viscosity under severe temperature conditions, such as in aircraft seals, automobile clutches and brakes, and vibration isolation in structures. Multifunctional Biological Fluid

[0060] A fluid capable of delivering drugs to a targeted body site is disclosed. The selected drug is attached to a magnetic core of iron or ferrites, cobalt or nickel coated with an optical layer of fluorescent Au or Ag molecules. The fluid particles are then magnetically driven to the target site where the drug is desorbed. Optical capturing, which is a consequence of the fluorescent molecules, assists in the magnetic localization.

[0061] The fluid of the previous embodiment can be extended to magnetic bioseparation and detection. For example, magnetic particles can be functionalized with a bioligand, which specifically binds to a target molecule, cell, toxin, pathogen, DNA, RNA, proteins, and other biochemicals. This would isolate the required biomolecule from a mixture and the number of separated magnetic particles can be detected with the help of highly sensitive magnetic field sensors, such as HGMS (high gradient magnetic separators), or SQUID (Superconducting Quantum Interface Design).

[0062] All of these modules can be miniaturized and placed on a microchip where micropumps would inject the sample fluid into various microchambers/ microreactors. The microreactors will contain a multifunctional biological fluid with different anylate specificity. Embedded in the reactors would be highly sensitive magnetic particle sensors, which will transduce the signal in to a user-friendly output. [0063] Based on the above, gas sensors for CO, CO₂, O₂, and the like, chemical sensors for water and other liquids, and biological sensors for glucose, DNA, and the like can be easily made.

Frequency Agile Functional Fluids

[0064] A functional fluid capable of switching from a RF

(radiofrequency) transparent to RF opaque state is disclosed. The core can be either magnetic, such as Fe, Co, Ni, etc., or conducting, such as Cu, Ag, Au, polymers, such as polyaniline, polypyrolle, etc., and the encapsulating polymer matrix can be polystyrene or PMMA. Variations in electric or magnetic field will cause local permeability variations to effect RF limiting features.

[0065] In another embodiment, indium tin oxide in a silica, alumina or titanium oxide matrix are subjected to varying electric fields. The electric field changes the oxidation state of the metal oxide particles, thereby exhibiting an electrochromic effect.

[0066] In yet another embodiment, semiconductor nanocrystals, such as CdSe are dispersed in a polymer matrix containing a dye. As the intensity of the light changes, a photochromic effect is observed. This is due to optical nonlinearity possessed by semiconductor species. These photochromic fluids may be made to form a flexible polymer sheet, which would be useful in making, for example, automatic automobile sunshades, etc.

Other Functional fluids

[0067] Multifunctionality in fluids is highly desirable. In general, upon interaction of one energy form with the other, there is a creation of a third energy component to meet the law of conservation of energy. For example, SiC-based particles used as abrasives generate a lot of heat, which may severely damage the surface they are acting on. The present invention addresses this by coating SiC particles with a coating of Au, Ag, Cu, Ni, or the like. An abrasive fluid, including SiC coated particles, can be used in sensitive applications, such as in microelectronics where heat is a big deterrent and causes damage to microelectronic circuitry. Other abrasive particles that can likewise be coated with a heat-absorbing material, include those made of boron carbide, iron carbide, aluminum oxide, zirconium oxide, titanium diboride, silica, yttrium-aluminum-garnet, or a combination thereof.

[0068] In another embodiment, SiC particles are coated with a pre-ceramic polymer, such as polysilsesquioxane or polycarbosilane. These are structural materials useful in flame-resistance and high temperature applications, where the pre-ceramic polymer turns into a ceramic with applied heat (Figure 16). The use of a polymer in structures generally gives the benefits of adhesion and aesthetics, while ceramics are used for high temperature stability. [0069] In yet another embodiment, a self-lubricating high temperature functional fluid is disclosed. The core particle can be made of Cu, while the coatings can be of graphite, bismuth, indium or Teflon^®. The coated copper particles are dispersed in oils, such as hydraulic oil or mineral oil. These fluids can be used in various engineering structures, such as engines and transmission housing.

[0070] In yet another embodiment, a quenching fluid used in heat-treating operation of metals, such as quenching, tempering, austempering and martempering is disclosed. The fluid removes heat from the heated metal. The cooling rate determines the microstructure, such as grain size, grain shape and phase (alpha, gamma, beta, delta, austenite, matensite, bainite, pearlite, cementite) composition of the part being made. The cooling rate can be adjusted by adjusting the thermal conductivity of the fluid. By incorporating polymer-coated particles with desired thermal conductivities in the quenching fluid, the cooling rate can be adjusted or controlled. The coating thickness preferably varies from 1nm to 100 μm with the number of layers ranging preferably from one to ten. The polymer coating is preferably based on polyalkylene glycol, polyvinyl alcohol, or a combination thereof. The particles can be metals (aluminum, titanium, copper, silicon, zinc, iron, cobalt, nickel, chromium, bismuth, silver, tungsten, molybdenum, or a combination thereof), ceramics (graphite, aluminum oxide, silicon oxide, beryllium oxide, titanium boride, molybdenum boride, silicon carbide, boron carbide, zirconium boride, hafnium boride, aluminium nitride, iron oxide, or a combination thereof) intermetallics (molybdenum silicide, titanium aluminides, nickel aluminides, berrylides, or a combination thereof), or a combination thereof. The coated particles can be dispersed in water, oil (mineral oil, silicone oil, hydraulic oil, synthetic oil, or a combination thereof) or an emulsion (sodium dodecyl sulfate in water, polyethylene glycol in water, polyvinyl alcohol in water, oil in water, polystyrene in water, polyacrylamide in water, or a combination thereof). The composition of the particles can be tailored to obtain different thermal conductivities (0 - 400 W/m.°K) in the fluid. Similarly, by adjusting the quantity of the particles (1- 90 volume %) in the fluid, thermal conductivities can be adjusted.

Example 1 [0071] Powder particles of iron with particle size of about 20 nm were synthesized from iron pentacarbonyl using microwave plasma synthesis technique. Argon was used as the plasma gas. The iron powders were subsequently coated with a layer of copper measuring with variable thickness (about 1 nm to 1000 nm) using a chemical synthesis technique. These powders were coated with sodium hexametaphosphate for dispersion in hydraulic oil for use as magneto-rheological fluids with a thermal control. The viscosity of the fluid could be changed by the application of a magnetic field to effect damping in shock absorbers used in automobiles and machinery. The copper coating will dissipate the heat generated from the motion of the moving parts in the damper. [0072] Table 4 below shows the effect of the applied magnetic field on the yield stress. The magnetic field is varied by varying the current that is applied. The change in yield stress is effected as a result in the change of viscosity. In other words, an increase in yield stress signifies a higher viscosity.

Table 4: Change in Yield Stress with Applied Current

Example 2 [0073] Ultrafine particles of aluminum oxide with a particle size of about 1 nm to 200 nm were prepared using microwave plasma synthesis of aluminum hydroxide using oxygen as the plasma gas. The nanoparticles were coated with a layer of cetyl trimethyl ammonium bromide with a coating thickness from about 1 nm to 20 nm. The coated particles were dispersed in a polyetherimide (PEI) polymer. The particles increased the inherent flame retardancy of the polymer while the fillers increased the mechanical properties and resistance to wear.

Example 3 [0074] Powder particles of iron with particle size ranging from about 1nm to 40 μm were synthesized by microwave plasma synthesis using iron pentacarbonyl as the source and argon as the plasma gas. The powder particles were coated with a layer of polystyrene. The polystyrene coating was carried out in the gas phase in the microwave plasma synthesis. The thickness of the polystyrene ranges from about 1nm to 100nm. The coated particles are dispersed in a carrier fluid such as saline solution, water or blood for injection into a human body. These particles may be surface modified with various procoagulants such as thrombin, factor 7A and like for arresting internal hemorrhage. Also, the particles may be attached with various antibodies/drugs/antigens for toxin, purification, isolation of biomolecules, water and chemical pollution and like.

Example 4 [0075] Aluminum nitride powders with a particle size of about 1 nm to 10 μm were coated with an about 1nm to 100 nm layer of ethyl cyano acrylate using microwave plasma technique. The aluminum nitride powders were prepared using microwave plasma synthesis of trimethyl aluminum and ammonia. The coated aluminum nitride particles are then dispersed in an adhesive resin for mounting heat sinks to electronic substrates. The aluminum nitride provides effective heat dissipation due to its high thermal conductivity as well as provide good mechanical strength to the adhesive.

Example 5 [0076] Copper powders with a particle size of about 1nm to 50 μm were mixed in a solution of ethylene glycol and water. The concentration of the copper powders in the ethylene glycol solution varied from about 10 vol% to 60 vol%. This fluid is used for heat transfer in furnaces, pumps and engines. The ethylene glycol acts as a rust inhibitor while the copper powders help in the removal of heat.

[0077] While this invention has been described as having preferred sequences, ranges, steps, materials, or designs, it is understood that it includes further modifications, variations, uses and/or adaptations thereof following in general the principle of the invention, and including such departures from the present disclosure as those come within the known or customary practice in the art to which the invention pertains, and as may be applied to the central features hereinbeforesetforth, and fall within the scope of the invention and of the limits of the appended claims.

[0078] The following references, to the extent that they provide exemplary procedural or other details supplementary to those set forth herein, are specifically incorporated herein by reference.

1. Azuma, Y. et al. "Coating of ferric oxide particles with silica by hydrolysis of TEOS", Journal of the Ceramic Society of Japan, 100(5), 646-51 (May 1992).

2. Atarashi, T. et al. "Synthesis of ethylene-glycol-based magnetic fluid using silica-coated iron particle", Journal of Magnetism and

Magnetic Materials, 201 , 7-10 (1999).

3. Homola, A. M. et al., "Novel Magnetic Dispersions Using Silica Stabilized Particles", IEEE Transactions on Magnetics, 22 (5), 716-719 (September 1986). 4. Giri, A. et al. "AC Magnetic Properties of Compacted FeCo

Nanocomposites", Mater. Phys. and Mechanics, 1 , 1 -10 (2000).

Claims

WHAT IS CLAIMED IS:

1. A particulate material, comprising: a) a predetermined amount of core particles with a plurality of coatings; and b) said core particles having an average particle size of . 5 about 1nm to 500μm.

2. The particulate material of Claim 1, wherein: a) said core particles comprise a member selected from the group consisting of a metal, a polymer, a ceramic material, an intermetallic material, an alloy, and a • 5 combination thereof.

3. The particulate material of Claim 2, wherein: a) the metal is selected from the group consisting of copper, cobalt, nickel, aluminum, iron, tin, gold, silver, chromium, molybdenum, tungsten, zinc, silicon, magnesium,

₅ titanium, vanadium, magnesium, germanium, zirconium, niobium, rhenium, iridium, cadmium, indium, hafnium, tantalum, platinum, neodymium, gallium, zinc, an alloy, an oxide, and a combination thereof.

4. The particulate material of Claim 2, wherein: a) the polymer is selected from the group consisting of polystyrene, polymethyl methacrylate, polyvinyl alcohol, polyphenylene vinylene, and a combination thereof.

5. The particulate material of Claim 2, wherein: a) the ceramic material is selected from the group consisting of iron oxide, zinc ferrite, manganese ferrite, zinc oxide, aluminum oxide, silicon dioxide, silicon carbide, boron

^• 5 carbide, carbon, indium oxide, titania, aluminum nitride, zirconia, tin oxide, chromium oxide, yttrium oxide, niobium oxide, hafnium oxide, tantalum oxide, tungsten oxide, magnesium oxide, boron nitride, silicon nitride, hafnium nitride, tantalum nitride, tungsten nitride, iron 10 nitride, vanadium nitride, titanium, silicon carbide, chromium carbide, vanadium carbide, titanium carbide, iron carbide, zirconium carbide, niobium carbide, hafnium carbide, tungsten carbide, tantalum carbide, titanium diboride, vanadium boride, iron boride, zirconium

• 15 diboride, hafnium diboride, tantalum diboride, nickel boride, cobalt boride, chromium boride and a combination thereof.

6. The particulate material of Claim 2, wherein: a) the intermetallic material is selected from the group consisting of titanium aluminide, niobium aluminide, iron aluminide, nickel aluminide, ruthenium aluminide, iridium

, 5 aluminide, chromium aluminide, titanium silicide, niobium silicide, zirconium silicide, molybdenum silicide, hafnium silicide, tantalum silicide, tungsten silicide, iron silicide, cobalt silicide, nickel silicide, magnesium silicide, yttrium silicide, cadmium silicide, berryllium oxide, nickel

• 10 berryllide, niobium berryllide, tantalum berryllide, yttrium berryllide, tantalum berryllide, zirconium berryllide, and a combination thereof.

7. The particulate material of Claim 2, wherein: a) the alloy is selected from the group consisting of indium tin oxide, cadmium selenide, iron-cobalt, ferro-nickel, ferro-silicon, ferro-manganese, ferro-magnesium, brass, .5 bronze, steel, and a combination thereof.

8. The particulate material of Claim 1, wherein: a) one of said coatings has a thickness of about 1nm to 10μm.

9. The particulate material of Claim 8, wherein: a) a portion of said core particles includes up to ten of said coatings.

10. The particulate material of Claim 8, wherein: a) said coatings have varying thickness.

11. The particulate material of Claim 8, wherein: a) said coatings have generally the same thickness.

12. The particulate material of Claim 1 , wherein: a) one of said coatings comprises a member selected from the group consisting of a metal, a polymer, a ceramic material, an intermetallic material, and an alloy or a ' 5 combination thereof.

13. The particulate material of Claim 1 , wherein: a) said core particles comprise a general shape selected from the group consisting of a sphere, a needle, a cube, an oval, irregular, a cylinder, a diamond, a lamella, a • 5 polyhedron, and a combination thereof.

14. The particulate material of Claim 12, wherein: a) the metal is selected from the group consisting of iron, cobalt, nickel, copper, gold, silver, tungsten, silicon, aluminum, zinc, molybdenum, indium, bismuth,

.5 vanadium, magnesium, germanium, zirconium, niobium, rhenium, iridium, cadmium, indium, hafnium, tantalum, platinum, neodymium, gallium, zinc, and a combination thereof.

15. The particulate material of Claim 12, wherein: a) the polymer is selected from the group consisting of polyethylene glycol, sorbitol, manitol, starch, dextran, poly methyl methacrylate, polyaniline, polystyrene, poly

• 5 pyrolle, N-isopropyl acrylamide, acrylamide, lecithin, and a combination thereof.

16. The particulate material of Claim 12, wherein: a) the ceramic material is selected from the group consisting of iron oxide, zinc ferrite, manganese ferrite, zinc oxide, aluminum oxide, silicon dioxide, silicon carbide, boron 5 carbide, carbon, indium oxide, titania, aluminum nitride, zirconia, tin oxide, chromium oxide, yttrium oxide, niobium oxide, hafnium oxide, tantalum oxide, tungsten oxide, magnesium oxide, boron nitride, silicon nitride, hafnium nitride, tantalum nitride, tungsten nitride, iron

10 nitride, vanadium nitride, titanium, silicon carbide, chromium carbide, vanadium carbide, titanium carbide, iron carbide, zirconium carbide, niobium carbide, hafnium carbide, tungsten carbide, tantalum carbide, titanium diboride, vanadium boride, iron boride, zirconium

^• 15 diboride, hafnium diboride, tantalum diboride, nickel boride, cobalt boride, chromium boride and a combination thereof.

17. The particulate material of Claim 12, wherein: a) the intermetallic material is selected from the group consisting of titanium aluminide, niobium aluminide, iron aluminide, nickel aluminide, ruthenium aluminide, iridium

5 aluminide, chromium aluminide, titanium silicide, niobium silicide, zirconium silicide, molybdenum silicide, hafnium silicide, tantalum silicide, tungsten silicide, iron silicide, cobalt silicide, nickel silicide, magnesium silicide, yttrium silicide, cadmium silicide, berryllium oxide, nickel

^{• 1 0} berryllide, niobium berryllide, tantalum berryllide, yttrium berryllide, tantalum berryllide, zirconium berryllide, and a combination thereof.

18. The particulate material of Claim 12, wherein: a) the alloy is selected from the group consisting of ferro- nickel, ferro-silicon, ferro-manganese, ferro-magnesium, brass, bronze, steel, and a combination thereof.

19. The particulate material of Claim 1 , wherein: a) said core particles with said plurality of coatings selectively interact with one or more of an external stimulus selected from the group consisting of an electric

5 field, a magnetic field, a thermal field, an optical field, and a combination thereof.

20. The particulate material of Claim 19, wherein: a) said core particles interact with one or more of said external stimulus individually or simultaneously.

21. A particulate composition, comprising: a) a carrier medium; b) a predetermined amount of a particulate material in said medium;

• ⁵ c) said particulate material comprising core particles with a plurality of coatings; and d) said core particles having an average particle size of about 1nm to 500μm.

22. The particulate composition of Claim 21 , wherein: a) said carrier medium comprises a fluid.

23. The particulate composition of Claim 22, wherein: a) said core particles comprise a member selected from the group consisting of a metal, a polymer, a ceramic material, an intermetallic material, an alloy, and a •⁵ combination thereof.

24. The particulate composition of Claim 23, wherein: a) the metal is selected from the group consisting of copper, cobalt, nickel, aluminum, iron, tin, gold, silver, chromium, copper, tungsten, zinc, silicon, molybdenum, magnesium,

•⁵ titanium, vanadium, magnesium, germanium, zirconium, niobium, rhenium, iridium, cadmium, indium, hafnium, tantalum, platinum, neodymium, gallium, zinc, an alloy, an oxide, and a combination thereof.

25. The particulate composition of Claim 23, wherein: a) the polymer is selected from the group consisting of polystyrene, polymethyl methacrylate, polyvinyl alcohol, polyphenylene vinylene, and a combination thereof.

26. The particulate composition of Claim 23, wherein: a) the ceramic material is selected from the group consisting of iron oxide, zinc ferrite, manganese ferrite, zinc oxide, aluminum oxide, silicon dioxide, silicon carbide, boron

■5 carbide, carbon, indium oxide, titania, aluminum nitride, zirconia, tin oxide, chromium oxide, yttrium oxide, niobium oxide, hafnium oxide, tantalum oxide, tungsten oxide, magnesium oxide, boron nitride, silicon nitride, hafnium nitride, tantalum nitride, tungsten nitride, iron

> ¹0 nitride, vanadium nitride, titanium, silicon carbide, chromium carbide, vanadium carbide, titanium carbide, iron carbide, zirconium carbide, niobium carbide, hafnium carbide, tungsten carbide, tantalum carbide, titanium diboride, vanadium boride, iron boride, zirconium

^•15 diboride, hafnium diboride, tantalum diboride, nickel boride, cobalt boride, chromium boride, and a combination thereof.

27. The particulate composition of Claim 23, wherein: a) the intermetallic material is selected from the group consisting of titanium aluminide, niobium aluminide, iron aluminide, nickel aluminide, ruthenium aluminide, iridium

.5 aluminide, chromium aluminide, titanium silicide, niobium silicide, zirconium silicide, molybdenum silicide, hafnium silicide, tantalum silicide, tungsten silicide, iron silicide, cobalt silicide, nickel silicide, magnesium silicide, yttrium silicide, cadmium silicide, berryllium oxide, nickel

•10 berryllide, niobium berryllide, tantalum berryllide, yttrium berryllide, tantalum berryllide, zirconium berryllide, and a combination thereof.

28. The particulate composition of Claim 23, wherein: a) the alloy is selected from the group consisting of indium tin oxide, cadmium selenide, iron-cobalt, ferro-nickel, ferro-silicon, ferro-manganese, ferro-magnesium, brass, •5 bronze, steel, and a combination thereof.

29. The particulate composition of Claim 22, wherein: a) one of said coatings has a thickness of about 1nm to 10μm.

30. The particulate composition of Claim 29, wherein: a) a portion of said core particles includes up to ten of said coatings.

31. The particulate composition of Claim 29, wherein: a) said coatings have varying thicknesses.

32. The particulate composition of Claim 29, wherein: a) said coatings have generally the same thickness.

33. The particulate composition of Claim 22, wherein: a) one of said coatings comprises a member selected from the group consisting of a metal, a polymer, a ceramic material, an intermetallic material, an alloy, and a • 5 combination thereof.

34. The particulate composition of Claim 22, wherein: a) said core particles comprise a general shape selected from the group consisting of a sphere, a needle, a cube, an oval, irregular, a cylinder, a diamond, a lamella, a 5 polyhedron, and a combination thereof.

35. The particulate composition of Claim 33, wherein: a) the metal is selected from the group consisting of iron, cobalt, nickel, copper, gold, silver, tungsten, silicon, aluminum, zinc, molybdenum, indium, bismuth,

5 vanadium, magnesium, germanium, zirconium, niobium, rhenium, iridium, cadmium, indium, hafnium, tantalum, platinum, neodymium, gallium, zinc, and a combination thereof.

36. The particulate composition of Claim 33, wherein: a) the polymer is selected from the group consisting of polyethylene glycol, sorbitol, manitol, starch, dextran, poly methyl methacrylate, polyaniline, polystyrene, poly

•5 pyrolle, N-isopropyl acrylamide, acrylamide, lecithin, and a combination thereof.

37. The particulate composition of Claim 33, wherein: a) the ceramic material is selected from the group consisting of iron oxide, zinc ferrite, manganese ferrite, zinc oxide, aluminum oxide, silicon dioxide, silicon carbide, boron

■ 5 carbide, carbon, indium oxide, titania, aluminum nitride, zirconia, tin oxide, chromium oxide, yttrium oxide, niobium oxide, hafnium oxide, tantalum oxide, tungsten oxide, magnesium oxide, boron nitride, silicon nitride, hafnium nitride, tantalum nitride, tungsten nitride, iron

•10 nitride, vanadium nitride, titanium, silicon carbide, chromium carbide, vanadium carbide, titanium carbide, iron carbide, zirconium carbide, niobium carbide, hafnium carbide, tungsten carbide, tantalum carbide, titanium diboride, vanadium boride, iron boride, zirconium

• 15 diboride, hafnium diboride, tantalum diboride, nickel boride, cobalt boride, chromium boride, and a combination thereof.

38. The particulate composition of Claim 33, wherein: a) the intermetallic material is selected from the group consisting of titanium aluminide, niobium aluminide, iron aluminide, nickel aluminide, ruthenium aluminide, iridium

-5 aluminide, chromium aluminide, titanium silicide, niobium silicide, zirconium silicide, molybdenum silicide, hafnium silicide, tantalum silicide, tungsten silicide, iron silicide, cobalt silicide, nickel silicide, magnesium silicide, yttrium silicide, cadmium silicide, berryllium oxide, nickel

_' 10 berryllide, niobium berryllide, tantalum berryllide, yttrium berryllide, tantalum berryllide, zirconium berryllide, and a combination thereof.

39. The particulate composition of Claim 33, wherein: a) the alloy is selected from the group consisting of ferro- nickel, ferro-silicon, ferro-manganese, ferro-magnesium, brass, bronze, steel, and a combination thereof.

40. The particulate composition of Claim 22, wherein: a) said core particles with said plurality of coatings selectively interact with one or more of an external stimulus selected from the group consisting of an electric

^•5 field, a magnetic field, a thermal field, an optical field, and a combination thereof.

41. The particulate composition of Claim 40, wherein: a) said core particles interact with one or more of said external stimulus individually or simultaneously.

42. The composition of Claim 22, wherein: a) said fluid is selected from the group consisting of water, a water and oil mixture, oil, wax, a lubricant, a metallic fluid, a polymer, an organic solvent, and a combination thereof.

43. The particulate composition of Claim 22, further comprising: a) a dispersant or surfactant.

44. The particulate composition of Claim 43, wherein: a) said surfactant is selected from the group consisting of polyethylene glycol, glycerol, sorbitol, manitol, dextran, starch, lecithin, and a combination thereof.

45. A magneto-responsive fluid, comprising: a) a carrier fluid; b) a predetermined amount of a magnetic particulate material in said carrier fluid; and

₍5 c) said particulate material comprising core particles with a coating of a heat absorbing material.

46. The magneto-responsive fluid of Claim 45, wherein: a) said heat absorbing material is selected from the group consisting of copper, aluminum, silica, aluminum oxide, tungsten, and a combination thereof.

47. The magneto-responsive fluid of Claim 46, wherein: a) said core particles comprise a member selected from the group consisting of iron, iron oxide, cobalt, nickel, a ferrite, and a combination thereof.

48. The magneto-responsive fluid of Claim 47, wherein: a) said carrier fluid is selected from the group consisting of water, oil, glycerol, an elastomer, a polymer, an organic solvent, and a combination thereof.

49. The magneto-responsive fluid of Claim 48, wherein: a) the concentration of said particulate material is about 2 to 90% by volume of said carrier fluid.

50. The magneto-responsive fluid of Claim 49, wherein: a) said core particles have an average particle size of about 25nm to 150nm.

51. The magneto-responsive fluid of Claim 49, further comprising: a) a surfactant selected from the group consisting of oleic acid, lecithin, polyethylene glycol, starch, glycerol, sorbitol, manitol, polyethylene glycol, and a combination ^* 5 thereof.

52. The magneto-responsive fluid of Claim 45, wherein: a) said core particles comprise a general shape selected from the group consisting of a sphere, a needle, a cube, an oval, irregular, a cylinder, a diamond, a lamella, a polyhedron, and a combination thereof.

53. The magneto-responsive fluid of Claim 45, wherein: a) said core particles comprise super-paramagnetic particles.

54. A magneto-responsive fluid, comprising: a) a generally optically clear carrier fluid; and b) a predetermined amount of a magnetic particulate material in said carrier fluid.

55. The magneto-responsive fluid of Claim 54, wherein: a) said carrier fluid is selected from the group consisting of polymethyl methacrylate, titanium dioxide, a polycarbonate, and indium oxide.

56. A method of varying turbidity of a fluid, comprising the steps of: a) providing a fluid including a generally optically clear carrier fluid and a predetermined amount of a magnetic particulate material dispersed in the carrier fluid; and b) applying a magnetic field to the fluid thereby varying the turbidity of the fluid.

57. The method of Claim 56, wherein: the fluid becomes less turbid when the magnetic field is applied and returns to its initial general turbidity level when the magnetic field is removed.

58. A magneto-responsive fluid, comprising: a) a predetermined amount of a magnetic particulate material in a polymer matrix; and b) said matrix is selected from the group consisting of polystyrene, polymethyl methacrylate, polyphenylene vinylene, polyaniline, and a combination thereof.

59. The magneto-responsive fluid of Claim 58, wherein: a) said particulate material comprises particles selected from the group consisting of iron, iron oxide, nickel, cobalt, a ferrite, and a combination thereof.

0. A method of varying conductivity of a fluid, comprising the steps of: a) providing a fluid including a predetermined amount of a magnetic particulate material in a polymer matrix, the matrix having been selected from the group consisting of polystyrene, polymethyl methacrylate, poly phenylene vinylene, polyaniline, and a combination thereof; and b) applying a magnetic field to the fluid thereby varying the conductivity of the fluid.

61. The method of Claim 60, wherein: the magnetic particulate material gets aligned along a generally linear path when the magnetic field is applied.

62. The method of Claim 60, wherein: the fluid becomes more conductive when the magnetic field is applied and returns to its initial general conductivity level when the magnetic field is removed.

63. An optical fluid, comprising: a) a carrier fluid; b) a predetermined amount of a particulate material in said carrier fluid; and c) said particulate material comprising core particles with a coating of a heat absorbing material.

64. The optical fluid of Claim 63, wherein: a) said core particles have an average particle size of about 1 nm to 500 μm.

65. The optical fluid of Claim 64, wherein: a) said core particles comprise a general shape selected from the group consisting of a sphere, a needle, a cube, an oval, irregular, a cylinder, a diamond, a lamella, a polyhedron, and a combination thereof.

66. The optical fluid of Claim 65, wherein: a) the coating has a thickness of about 10nm to 100nm.

67. The optical fluid of Claim 64, wherein: a) the heat absorbing material is selected from the group consisting of copper, aluminum, silica, aluminum oxide, tungsten, and a combination thereof.

68. The optical fluid of Claim 64, wherein: a) said particulate material comprises ceramic particles selected from the group consisting of zinc oxide, indium oxide, silica, and a combination thereof.

69. A method of varying optical clarity of a fluid, comprising the steps of: a) providing a fluid including a predetermined amount of a particulate material, the particulate material including core

5 particles with a coating of a heat absorbing material; and b) raising the temperature of the fluid thereby varying the optical clarity of the fluid.

70. The method of Claim 69, wherein: the fluid becomes more clear as the temperature is raised.

71. An optical fluid, comprising: a) a predetermined amount of a semiconductor particulate material in an index matching fluid; and b) said semiconductor material comprising core particles • 5 selected from the group consisting of gallium arsenide, silicon carbide, silicon, germanium, cadmium selenide, and a combination thereof.

72. The optical fluid of Claim 71 , wherein: a) the index matching fluid is selected from the group consisting of water, oil, mixture of water and oil, poly ethylene glycol, polymethylmethacrylate, polyacrylamide, ■5 polystyrene, and a combination thereof.

73. The optical fluid of Claim 72, wherein: a) said core particles have an average particle size of about 1 nm to 500 μm.

74. The optical fluid of Claim 73, wherein: a) said core particles comprise a general shape selected from the group consisting of a sphere, a needle, a cube, an oval, irregular, a cylinder, a diamond, a lamella, a 5 polyhedron, and a combination thereof.

75. The optical fluid of Claim 74, further comprising: a) a surfactant selected from the group consisting of oleic acid, lecithin, polyethylene glycol, starch, glycerol, sorbitol, manitol, and a combination thereof.

76. The optical fluid of Claim 73, wherein: a) said core particles comprise semiconductor nanodots.

77. The optical fluid of Claim 73, wherein: a) said core particles comprise nanocrystalline particles.

78. A method of varying transparency of a fluid, comprising the steps of: a) providing a fluid including a predetermined amount of a semiconductor particulate material in an index matching

5 fluid; and b) subjecting the fluid to an electromagnetic radiation thereby varying the transparency of the fluid.

79. The method of Claim 78, wherein: the fluid becomes less transparent as the intensity of the electromagnetic radiation is increased and becomes more transparent as the intensity of the electromagnetic radiation is •5 decreased.

80. An electro-optical fluid, comprising: a) a predetermined amount of a semiconductor particulate material in a conducting fluid; b) said particulate material comprising core particles with a -5 coating of a heat absorbing material; and c) said core particles selected from the group consisting of indium oxide, zinc oxide, and a combination thereof.

81. The electro-optical fluid of Claim 80, wherein: a) said coating has a thickness of about 10 nm-10μm.

82. The electro-optical fluid of Claim 80, wherein: a) the conducting fluid is selected from the group consisting of water, mineral oil, polypyrole, polyaniline, and a combination thereof.

83. The electro-optical fluid of Claim 82, wherein: a) said core particles have an average particle size of about 1 nm to 500 μm.

84. The electro-optical fluid of Claim 83, wherein: a) said core particles comprise a general shape selected from the group consisting of a sphere, a needle, a cube, an oval, irregular, a cylinder, a diamond, a lamella, a 5 polyhedron, and a combination thereof.

85. The electro-optical fluid of Claim 84, further comprising: a) a surfactant selected from the group consisting of oleic acid, lecithin, polyethylene glycol, starch, glycerol, sorbitol, manitol, and a combination thereof.

86. The electro-optical fluid of Claim 85, wherein: a) said heat absorbing material is selected from the group consisting of copper, aluminum, silica, aluminum oxide, tungsten, and a combination thereof.

87. A method of varying transparency of a fluid, comprising the steps of: a) providing a fluid including a predetermined amount of a semiconductor particulate material in a conducting fluid, the particulate material including core particles with a coating of a heat absorbing material; and b) subjecting the fluid to an electric field thereby varying the transparency of the fluid.

88. The method of Claim 87, wherein: the fluid becomes less transparent as the intensity of the electric field is increased and becomes more transparent as the intensity of the electric field is decreased.

89. A thermo-optical fluid, comprising: a) a predetermined amount of a luminescent particulate material in a thermally switchable polymer; and b) the particulate material comprising core particles having •5 an average particle size of about 1 nm to 500 μm.

90. The thermo-optical fluid of Claim 89, further comprising: a) a carrier medium selected from the group consisting of water, oil, and a combination thereof.

91. The thermo-optical fluid of Claim 90, wherein: a) said core particles comprise a general shape selected from the group consisting of a sphere, a needle, a cube, an oval, irregular, a cylinder, a diamond, a lamella, a -5 polyhedron, and a combination thereof.

92. The thermo-optical fluid of Claim 91 , further comprising: a) a surfactant selected from the group consisting of oleic acid, lecithin, polyethylene glycol, starch, glycerol, sorbitol, manitol, and a combination thereof.

93. The thermo-optical fluid of Claim 89, wherein: a) said core particles are selected from the group consisting of gold, silver, indium oxide, zinc oxide, and a combination thereof.

94. The thermo-optical fluid of Claim 93, wherein: a) the polymer is selected from the group consisting of N- isopropylacrylamide, polyvinyl alcohol, polyethylene glycol, polyalkelene glycol, and a combination thereof.

95. A method of varying the chromicity of a fluid, comprising the steps of : a) providing a fluid including a predetermined amount of a luminescent particulate material in a thermally sensitive polymer; and b) raising the temperature of the fluid thereby varying the chromicity of the fluid.

96. The method of Claim 95, wherein: the luminescent particulate material comprises core particles having an average particle size of about 10 nm to 10 μm.

97. The method of Claim 96, wherein: the core particles comprise particles selected from the group consisting of gold, silver, and a combination thereof.

98. An electro-responsive fluid, comprising: a) a dieelectric fluid: b) a predetermined amount of a particulate material in said fluid; and c) said particulate material comprising core particles with a coating of a heat absorbing material.

99. The electro-responsive fluid of Claim 98, wherein: a) the dieelectric fluid is selected from the group consisting of water and ethylene glycol.

100. The electro-responsive fluid of Claim 99, wherein: a) said coating has a thickness of about 10nm to 100μm.

101. The electro-responsive fluid of Claim 100, wherein: a) said core particles are selected from the group consisting of copper, silica, and a combination thereof.

102. The electro-responsive fluid of Claim 98, wherein: a) said core particles have an average particle size of about 1 nm to 500 μm.

103. The electro-responsive fluid of Claim 102, wherein: a) said core particles comprise a general shape selected from the group consisting of a sphere, a needle, a cube, an oval, irregular, a cylinder, a diamond, a lamella, a • 5 polyhedron, and a combination thereof.

104. The electro-responsive fluid of Claim 103, further comprising: a) a surfactant selected from the group consisting of oleic acid, lecithin, polyethylene glycol, starch, glycerol, sorbitol, manitol, and a combination thereof.

105. A method of varying viscosity of a fluid, comprising the steps of: a) providing a dieelectric fluid including a predetermined amount of a particulate material, the particulate material including core particles with a coating of a heat absorbing

. ⁵ material; and b) subjecting the fluid to an electric field thereby varying the viscosity of the fluid.

106. The method of Claim 105, wherein: the fluid becomes more viscous as the intensity of the electric field is increased and becomes less viscous as the intensity of the electric field is decreased.

107. The method of Claim 105, wherein: the coating of a heat absorbing material absorbs heat generated due to the electric field.

108. A particle for delivery of an agent to a desired location in a system, comprising: a) a magneto-responsive core for assisting in transport of the particle to a desired location in a system; b) said core including a coating of a fluorescent material for tracking the movement of the particle in the system; and c) said fluorescent material comprising gold, silver, or a combination thereof.

109. The particle of Claim 108, wherein: a) said core has a size of about 1 nm to 500 μm.

110. The particle of Claim 109, wherein: a) said core comprises a general shape selected from the group consisting of a sphere, a needle, a cube, an oval, irregular, a cylinder, a diamond, a lamella, a polyhedron, and a combination thereof.

111. The particle of Claim 110, further comprising: a) a surfactant selected from the group consisting of oleic acid, lecithin, polyethylene glycol, starch, glycerol, sorbitol, manitol, and a combination thereof.

112. The particle of Claim 108, wherein: a) said core comprises a member selected from the group consisting of iron, iron oxide, a ferrite, cobalt, nickel, and a combination thereof.

113. The particle of Claim 112, wherein: a) the agent comprises a biological, a pharmaceutical, or a chemical agent, or a combination thereof.

114. A method for delivery of an agent to a desired location in a system, comprising the steps of: a) providing a magneto-responsive core including a coating of a fluorescent material selected from the group

. 5 consisting of gold, silver, and a combination thereof, the coating including an agent to be delivered to a desired location in a system; b) introducing the core in the system; c) tracking the movement of the particle in the system by . 10 sensing the fluorescent material; d) applying a magnetic field to move the particle to the desired location; and e) releasing the agent from the particle.

115. The method of Claim 1 14, wherein: the agent comprises a biological, a pharmaceutical, or a chemical agent, or a combination thereof.

116. An abrasive thermal fluid, comprising: a) a carrier fluid; b) a predetermined amount of a particulate material in said carrier fluid; and

• 5 c) said particulate material comprising core particles of an abrasive material with a coating of a heat conducting material.

117. The abrasive thermal fluid of Claim 116, wherein: a) said core particles have an average particle size of about 1 nm to 500 μm.

118. The abrasive thermal fluid of Claim 117, wherein: a) said core particles comprise a general shape selected from the group consisting of a sphere, a needle, a cube, an oval, irregular, a cylinder, a diamond, a lamella, a .5 polyhedron, and a combination thereof.

119. The abrasive thermal fluid of Claim 118, wherein: a) said abrasive material is selected from the group consisting of silicon carbide, boron carbide, titanium carbide, iron carbide, aluminum oxide, zirconium oxide,

•5 titanium diboride, silica, yittrium-aluminum-garnet, and a combination thereof.

120. The abrasive thermal fluid of Claim 119, wherein: a) said heat conducting material is selected from the group consisting of gold, silver, copper, nickel, and a combination thereof.

121. The abrasive thermal fluid of Claim 120, further comprising: a) a surfactant selected from the group consisting of oleic acid, lecithin, polyethylene glycol, starch, glycerol, sorbitol, manitol, and a combination thereof.

122. The abrasive thermal fluid of Claim 121 , wherein: a) said carrier fluid is selected from the group consisting of oil, water, wax, a lubricant, and a combination thereof.

123. A magneto-responsive particulate material, comprising: a) a predetermined amount of a magnetic particulate material; and b) said particulate material comprising core particles with a chemical or biological antagonist material.

124. The particulate material of Claim 123, wherein: a) said biological material is antagonist to a molecule selected from the group consisting of a toxin, pathogen, DNA, RNA, protein, a biochemical, and a combination thereof.

125. The particulate material of Claim 123, wherein: a) said core particles are selected from the group consisting of iron, iron oxide, and a combination thereof.

126. The particulate material of Claim 123, wherein: a) said core particles comprise super-paramagnetic particles.

127. The particulate material of Claim 125, wherein: a) said core particles have an average particle size of about 1 nm to 500 μm.

128. The particulate material of Claim 127, wherein: a) said core particles comprise a general shape selected from the group consisting of a sphere, a needle, a cube, an oval, irregular, a cylinder, a diamond, a lamella, a • 5 polyhedron, and a combination thereof.

129. The particulate material of Claim 128, further comprising: a) a surfactant selected from the group consisting of polyethylene glycol, starch, dextran, and a combination thereof.

130. A method of separating a target molecule from a sample, comprising the steps of: a) provided a predetermined amount of a magnetic particulate material comprising core particles with a coating of a material antagonist to the target molecule; b) subjecting the sample to the magnetic particulate material thereby allowing the antagonist to bind with the target molecule; and c) applying a magnetic field thereby separating the target molecule bound to the core particles.

131. A radiofrequency-sensitive fluid, comprising: a) a predetermined amount of a particulate material in a matrix; b) said particulate material comprising core particles selected from the group consisting of a magnetic, conducting, semi-conductor, and a polymer material.

132. The radiofrequency-sensitive fluid of Claim 131, wherein: a) said core particles comprise a member selected from the group consisting of iron, cobalt, nickel, copper, silver, gold, polyaniline, polypyrolle, polystyrene, polymethyl metha crylate, a metal oxide, cadmium selenide, and a combination thereof.

133. The radiofrequency-sensitive fluid of Claim 132, wherein: a) said matrix is selected from the group consisting of polystyrene, polymethyl methacrylate, polyaniline, polypyrolle, silica, alumina, titanium oxide, a dye, and a combination thereof.

134. The radiofrequency-sensitive fluid of Claim 133, wherein: a) said core particles have an average particle size of about 1 nm to 500 μm.

135. The radiofrequency-sensitive fluid of Claim 134, wherein: a) said core particles comprise a general shape selected from the group consisting of a sphere, a needle, a cube, an oval, irregular, a cylinder, a diamond, a lamella, a polyhedron, and a combination thereof.

136. An article comprising the fluid of Claim 131.

137. A preceramic fluid, comprising: a) a predetermined amount of a particulate material in a matrix; and b) said particulate material comprising core particles of an abrasive material with a coating of a preceramic polymer.

138. The preceramic fluid of Claim 137, wherein: a) said core particles have an average particle size of about 1 nm to 500 μm.

139. The preceramic fluid of Claim 138, wherein: a) said core particles comprise a general shape selected from the group consisting of a sphere, a needle, a cube, an oval, irregular, a cylinder, a diamond, a lamella, a polyhedron, and a combination thereof.

140. The preceramic fluid of Claim 139, wherein: a) said polymer is selected from the group consisting of polysilsesquioxane, polycarbosilane, and a combination thereof.

141. The preceramic fluid of Claim 140, wherein: a) said abrasive material comprises silicon carbide.

142. The preceramic fluid of Claim 141 , wherein: a) said matrix is selected from the group consisting of silica, titania, alumina, and a combination thereof.

143. An article comprising the fluid of Claim 137.

144. The article of Claim 143, comprising: a) a substrate selected from the group consisting of steel, wood, cement, and a combination thereof.

145. A self-lubricating, high-temperature fluid, comprising: a) a carrier fluid; b) a predetermined amount of a particulate material in said fluid; c) said particulate material comprising core particles of a metal material; and d) a surfactant.

146. The self-lubricating, high-temperature fluid of Claim 145, wherein: a) said core particles comprise a coating of indium or polytetrafluroethene.

147. The self-lubricating, high-temperature fluid of Claim 146, wherein: a) said metal material is selected from the group consisting of copper, silver, gold, nickel, and a combination thereof.

148. The self-lubricating, high-temperature fluid of Claim 147, wherein: a) said surfactant is selected from the group consisting of oleic acid, lecithin, polyethylene glycol, starch, glycerol, •⁵ sorbitol, manitol, and a combination thereof.

149. The self-lubricating, high-temperature fluid of Claim 147, wherein: a) said core particles have an average particle size of about 1 nm to 500 μm.

150. The self-lubricating, high-temperature fluid of Claim 149, wherein: a) said core particles comprise a general shape selected from the group consisting of a sphere, a needle, a cube, δ an oval, irregular, a cylinder, a diamond, a lamella, a polyhedron, and a combination thereof.

151. The self-lubricating, high-temperature fluid of Claim 150, wherein: a) said carrier fluid is selected from the group consisting of oil, water, wax, lubricant, and a combination thereof.

152. An electrochromic fluid, comprising: a) a predetermined amount of a particulate material comprising core particles of a metal oxide in a matrix material; b) said core particles including a coating of a chromic material; and c) a surfactant.

153. The electrochromic fluid of Claim 152, wherein: a) said core particles have an average particle size of about 1 nm to 500 μm.

154. The electrochromic fluid of Claim 153, wherein: a) said metal oxide comprises tin oxide.

155. The electrochromic fluid of Claim 154, wherein: a) said coating comprises antimony.

156. The electrochromic fluid of Claim 155, wherein: a) said matrix is selected from the group consisting of titania, alumina, silica, and a combination thereof.

157. The fluid of Claim 156, wherein: a) said core particles comprise a general shape selected from the group consisting of a sphere, a needle, a cube, an oval, irregular, a cylinder, a diamond, a lamella, a polyhedron, and a combination thereof.

158. The electrochromic fluid of Claim 157, wherein: a) said surfactant is selected from the group consisting of oleic acid, lecithin, polyethylene glycol, starch, glycerol, sorbitol, manitol, and a combination thereof.

159. The electrochromic fluid of Claim 158, wherein: a) the fluid changes color when an electric filed is applied thereto.

160. A photochromic fluid, comprising: a) a predetermined amount of a semiconductor particulate material in a matrix; and b) said particulate material comprising core particles having an average particle size of about 1 nm to 500 μm.

161. The photochromic fluid of Claim 160, wherein: a) said core particles comprise a general shape selected from the group consisting of a sphere, a needle, a cube, an oval, irregular, a cylinder, a diamond, a lamella, a polyhedron, and a combination thereof.

162. The photochromic fluid of Claim 161 , further comprising: a) a surfactant selected from the group consisting of oleic acid, lecithin, polyethylene glycol, starch, glycerol, sorbitol, manitol, and a combination thereof.

163. The photochromic fluid of Claim 162, wherein: a) the semiconductor material comprises cadmium selenide.

164. The photochromic fluid of Claim 163, wherein: a) said matrix is selected from the group consisting of polystyrene, polymethyl methacrylate, polyethylene, and a combination thereof.

165. The photochromic fluid of Claim 164, wherein: a) the photochromic fluid changes color when subjected to an optical field.

166. The photochromic fluid of Claim 164, wherein: a) the photochromic fluid changes color when subjected to a different light intensity.

167. A method of varying radiofrequency absorption property of a fluid, comprising the steps of: a) providing a fluid with a predetermined amount of a magnetic particulate material in a polymer matrix; and .5 b) subjecting the fluid to a magnetic field thereby varying the radiofrequency absorption property thereof.

168. A method of varying radiofrequency absorption property of a fluid, comprising the steps of: a) providing a fluid with a predetermined amount of a conducting particulate material in a polymer matrix; and ^•5 b) subjecting the fluid to an electric field thereby varying the radiofrequency absorption property thereof.

169. A fluid sensor, comprising: a) a predetermined amount of a magnetic particulate material; and b) said particulate material comprising core particles with a coating of a material sensitive to a chemical or biological stimulus.

170. The fluid sensor of Claim 169, wherein: a) the chemical stimulus is selected from the group consisting of a solid, a liquid, a gas, and a combination thereof.

171. A quenching fluid, comprising: a) a carrier fluid; b) a predetermined amount of a particulate material in said carrier fluid; and c) said particulate material comprising core particles with a coating of a polymer material.

172. The quenching fluid of Claim 171 , wherein: a) said core particles have an average particle size of about 1 nm to 500 μm.

173. The quenching fluid of Claim 172, wherein: a) said core particles comprise a member selected from the group consisting of a metal, a ceramic material, an intermetallic material, and a combination thereof.

174. The quenching fluid of Claim 173, wherein: a) the coating has a thickness of about 1 nm to 10Oμm.

175. The quenching fluid of Claim 174, wherein: a) the polymer material is selected from the group consisting of polyalkylene, polyvinyl alcohol, and a combination thereof.

176. The quenching fluid of Claim 175, wherein: a) said carrier fluid is selected from the group consisting of water, oil, an emulsion, and a combination thereof.

177. The quenching fluid of Claim 175, wherein: a) a portion of said core particles includes up to ten of said coatings.

178. The quenching fluid of Claim 177, wherein: a) said coatings have varying thickness.

179. The quenching fluid of Claim 178, wherein: a) said coatings have generally the same thickness.

180. The quenching fluid of Claim 173, wherein: a) the metal is selected from the group consisting of copper, cobalt, nickel, aluminum, iron, bismuth, silver, chromium, molybdenum, tungsten, zinc, silicon, titanium, an alloy, an oxide, and a combination thereof.

181. The quenching fluid of Claim 173, wherein: a) the ceramic material is selected from the group consisting of graphite, aluminium oxide, silicon oxide, beryllium oxide, titanium boride, molybdenum boride, silicon carbide, boron carbide, zirconium boride, hafnium boride, aluminium nitride, iron oxide, and a combination thereof.

182. The quenching fluid of Claim 173, wherein: a) the intermetallic material is selected from the group consisting of molybdenum silicide, titanium aluminides, nickel aluminides, berrylides, and a combination thereof.

183. The quenching fluid of Claim 175, wherein: a) said carrier fluid is selected from the group consisting of water, mineral oil, silicone oil, hydraulic oil, synthetic oil, sodium dodecyl sulfate in water, polyethylene glycol in

_' 5 water, polyvinyl alcohol in water, oil in water, polystyrene in water, polyacrylamide in water, and a combination thereof.

184. The quenching fluid of Claim 171 , wherein: a) the quenching fluid comprises a thermal conductivity of about 0 to 400 W/m°K.

185. The quenching fluid of Claim 171 , wherein: a) the particulate material comprises about 1 to 90% by volume of said carrier fluid.

186. A method of cooling a material, comprising the steps of: a) providing a fluid, comprising: i) a carrier fluid; ii) a predetermined amount of a particulate material ^• 5 in the carrier fluid; and iii) the particulate material comprising core particles with a coating of a polymer material; b) subjecting the material to the fluid for cooling thereof.

187. The method of Claim 86, wherein: the fluid comprises a thermal conductivity of about 0 to 400 W/m°K.

188. The method of Claim 186, wherein: the particulate material comprises about 1 to 90% by volume of the carrier fluid.

189. The method of Claim 186, wherein: the coating has a thickness of about 1nm to 100μm.

190. The method of Claim 189, wherein: the polymer material is selected from the group consisting of polyalkylene, polyvinyl alcohol, and a combination thereof.

191. The method of Claim 186, wherein: the material comprises a metal.

192. The particulate material of Claim 2, wherein: a) the alloy comprises one or more metals selected from the group consisting of copper, cobalt, nickel, aluminum, iron, tin, gold, silver, chromium, molybdenum, tungsten, zinc, 5 silicon, magnesium, titanium, vanadium, magnesium, germanium, zirconium, niobium, rhenium, iridium, cadmium, indium, hafnium, tantalum, platinum, neodymium, gallium, zinc, an alloy, an oxide, and a combination thereof.

193. The particulate material of Clam 12, wherein: a) the alloy comprises one or more metals selected from the group consisting of copper, cobalt, nickel, aluminum, iron, tin, gold, silver, chromium, molybdenum, tungsten, zinc,

•5 silicon, magnesium, titanium, vanadium, magnesium, germanium, zirconium, niobium, rhenium, iridium, cadmium, indium, hafnium, tantalum, platinum, neodymium, gallium, zinc, an alloy, an oxide, and a combination thereof.

194. The particulate composition of Claim 23, wherein: a) the alloy comprises one or more metals selected from the group consisting of copper, cobalt, nickel, aluminum, iron, tin, gold, silver, chromium, molybdenum, tungsten, zinc,

• 5 silicon, magnesium, titanium, vanadium, magnesium, germanium, zirconium, niobium, rhenium, iridium, cadmium, indium, hafnium, tantalum, platinum, neodymium, gallium, zinc, an alloy, an oxide, and a combination thereof.

The particulate composition of Claim 33, wherein: a) the alloy comprises one or more metals selected from the group consisting of copper, cobalt, nickel, aluminum, iron, tin, gold, silver, chromium, molybdenum, tungsten, zinc, silicon, magnesium, titanium, vanadium, magnesium, germanium, zirconium, niobium, rhenium, iridium, cadmium, indium, hafnium, tantalum, platinum, neodymium, gallium, zinc, an alloy, an oxide, and a combination thereof.