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Method for producing compositions of nanoparticles on solid surfacesRelated Patent Categories: Specialized Metallurgical Processes, Compositions For Use Therein, Consolidated Metal Powder Compositions, And Loose Metal Particulate Mixtures, Processes, Producing Or Purifying Free Metal Powder Or Producing Or Purifying Alloys In Powder Form (i.e., Named Or Of Size Up To 1,000 Microns In Its Largest Dimension), Utilizing Electrothermic, Magnetic, Or Wave EnergyMethod for producing compositions of nanoparticles on solid surfaces description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070101824, Method for producing compositions of nanoparticles on solid surfaces. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application claims priority to U.S. Provisional Application Ser. No. 60/689,658, filed Jun. 10, 2005. STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT [0002] Not Applicable STATEMENT REGARDING GOVERNMENT RIGHTS [0003] Not Applicable BACKGROUND OF THE INVENTION [0004] (1) Field of the Invention [0005] The present invention relates to a method for producing metal nanoparticles on a solid surface of a substrate. In particular, the present invention relates to nanoparticles of a metal deposited on nanoparticles comprising a carbon or graphite in various forms such as carbon black, fibers and nanotubes, for instance. [0006] (2) Description of the Related Art [0007] U.S. Pat. No. 6,596,130 to Westman generally describes a process for microwave associated chemical transformation of organic compounds using ionic liquids (IL). This reference is incorporated herein in its entirety, particularly in reference to the ionic liquids. Microwave reactors are well known to those skilled in the art. OBJECTS [0008] It is therefore an object of the present invention to provide a novel method for producing metallic nanoparticles on solid surfaces. In particular, it is an object of the present invention to provide a process and resulting composite which is economical and relatively easy to prepare. It is also an object of the present invention to provide a simple way of controlling metal nanoparticle formation on any substrate which is of the utmost importance for the performance of any industrial catalyst or electrocatalyst based on supported metals. These and other objects will become increasingly apparent by reference to the following description. SUMMARY OF THE INVENTION [0009] The present invention relates to a method for producing nanoparticles of metal deposited on a surface of a substrate which comprises: (a) providing solution of an ionic liquid in a reducing solvent, such as ethylene glycol, containing a precursor of the metal on the substrate; and (b) exposing the metal precursor in the ionic liquid to microwaves so as to reduce the metal precursor to nanoparticles of the metal which are deposited on the substrate. Preferably the substrate has a surface which comprises carbon on which the nanoparticles of the metal are deposited. Preferably the carbon is a graphite, a carbon black particle, a nanotube, or a carbon fiber. Also, preferably the carbon is a buckyball. Preferably the carbon has at least one dimension which is a nanodimension. Preferably the substrate is a nanoparticle which is less than 100 nanometers in at least one dimension. Preferably at least two of the metal precursors are provided in admixture in step (a). [0010] The present invention also relates to a composite composition which comprises a substrate having nanoparticles of a metal deposited thereon. Preferably the nanoparticles of the metal are comprised of a noble metal alone or in combination with a transition metal. Preferably the nanoparticles of the metal are comprised of any metal alone or in combination with any other metal. Preferably the substrate is a nanoparticle having at least one dimension less than 100 nanometers. Preferably the substrate comprises a carbon. Preferably the substrate has a surface which comprises any solid on which the nanoparticles of the metal are deposited. [0011] The substance and advantages of the present invention will become increasingly apparent by reference to the following drawings and the description. DESCRIPTION OF DRAWINGS [0012] FIGS. 1A-1F are TEM micrographs and Pt graphs of particle size distributions of (1A, 1B) Pt/CB--N, (1C, 1D) Pt/CB--IM, and (1E, 1F) Pt/CB-M catalyst, where CB is carbon black, and where IM and M are specific ionic liquids. N is no ionic liquid. [0013] FIG. 2 is a graph showing the effect of the presence of ILs on the reduction of Pt size in CB-supported Pt catalysts. [0014] FIGS. 3A to 3F show TEM micrographs and graphs of Pt particle size distributions of (3A, 3B) Pt/GNF--N, (3C, 3D) Pt/GNF--IM and (3E, 3F) Pt/GNF-M nanocomposites, where GNF is graphite nanofibers. [0015] FIG. 4 is a graph which shows the mean size of Pt particles in N--Pt/sp-GNF, IM-Pt/sp-GNF and M-Pt/sp-GNF catalyst. [0016] FIG. 5 shows a TEM micrograph of Pt/a-SWNT-IM nanocomposite, where SWNT is single wall carbon nanotube. [0017] FIGS. 6A to 6F show TEM micrographs and graphs of Pt size distribution of (6A, 6B) Pt/MWNT-N, (6C, 6D) Pt/MWNT-IM, and (6E, 6F) Pt/MWNT-M nanocomposites, where MWNT is multi-walled carbon nanotube. Continue reading about Method for producing compositions of nanoparticles on solid surfaces... Full patent description for Method for producing compositions of nanoparticles on solid surfaces Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Method for producing compositions of nanoparticles on solid surfaces patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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