Abstract: A process for synthesizing carbon-metal nanocomposites. In one embodiment, the process includes the steps of preparing a metal derivative or a metal chelated derivative of a carbon-containing precursor in solid form, and subjecting the metal derivative or metal chelated derivative of a carbon-containing precursor in solid form to microwave radiation at a frequency in the range of 900 MHz to 5.8 GHz, for a period of time effective to generate a heat flow from inside of the metal derivative or metal chelated derivative of a carbon-containing precursor in solid form to the outside such that the temperature of the metal derivative or metal chelated derivative of a carbon-containing precursor in solid form reaches 1,000° C. in less than 6 minutes with a temperature (T) derivative over time (t), ?T/?t, no less than 2.5° C./second to form carbon-metal nanocomposites.

Abstract: The alloy fine particles of the present invention are fine particles of a solid solution alloy, in which a plurality of metal elements are mixed at the atomic level. The production method of the present invention is a method for producing alloy fine particles composed of a plurality of metal elements. This production method includes the steps of: (i) preparing a solution containing ions of the plurality of metal elements and a liquid containing a reducing agent; and (ii) mixing the solution with the liquid that has been heated.

Abstract: A magnetic metal powder having fluidity is provided which is composed of FePt nanoparticles synthesized by the polyol synthesis method that possess fct (face-centered tetragonal) structure and exhibit crystal magnetic anisotropy from immediately after synthesis. Specifically, there is provided a magnetic metal powder having fluidity which is composed of magnetic metal particles whose main components and the contents thereof are represented by the following general formula (1): [TXM1?X]YZ1?Y??(1), where T is one or both of Fe and Co, M is one or both of Pt and Pd, Z is at least one member selected from the group composed of Ag, Cu, Bi, Sb, Pb and Sn, X represents 0.3˜0.7, and Y represents 0.7˜1.

Abstract: The present invention relates to methods of making and using and compositions of metal nanoparticles formed by green chemistry synthetic techniques. For example, the present invention relates to metal nanoparticles formed with solutions of plant extracts and use of these metal nanoparticles in removing contaminants from soil and groundwater and other contaminated sites. In some embodiments, the invention comprises methods of making and using compositions of metal nanoparticles formed using green chemistry techniques.

Abstract: A polymetallic nanoparticle alloy having enhanced catalytic properties including at least one noble metal and at least one base metal, where the noble metal is preferentially dispersed near the surface of the nanoparticle and the base metal modifies the electronic properties of the surface disposed noble metal. The polymetallic nanoparticles having application as a catalyst when dispersed on a carbon substrate and in particular applications in a fuel cell. In various embodiments a bimetallic noble metal-base metal nanoparticle alloy may be used as an electrocatalyst offering enhanced ORR activity compared to the monometallic electrocatalyst of noble metal.

Abstract: Synthesis of nanoparticles with particle size control is provided by the method of using two different metal-containing precursors, a capping component, an optional reducing agent, and then contacting the two precursors with the capping component to form a reaction solution, which is heated to produce first and second metals-containing nanoparticles. By controlling the ratio of the concentration of the capping component to the total concentration of the two metal-containing precursors, the nanoparticles can have diameters ranging between about 1 nm to about 15 nm. A decrease in the concentration of the capping component typically increases the size of the nanoparticles. Preferred compositions include Pt and Co-containing alloy nanoparticles. Controlled synthesis of larger, about 6 nm to about 12 nm, sized nanoparticles can be achieved in a solvent-free reaction process.

Abstract: Metal nanoparticles containing two or more metals are formed by heating or refluxing a mixture of two or more metal salts, such as a metal acetates, and a passivating solvent, such as a glycol ether, at a temperature above the melting point of the metal salts for an effective amount of time.

Abstract: The invention provides an aqueous solution-based method for producing nanosized silver platelets, which employs the controlled mixing of a silver ion solution, a reducing solution, and an acidic solution in the presence of palladium ions.

Abstract: The present invention provides high quality monodisperse or substantially monodisperse InAs nanocrystals in the as-prepared state. In some embodiments, the as-prepared substantially monodisperse InAs nanocrystals demonstrate a photoluminescence of between about 700 nm and 1400 nm.

Abstract: A metal powder manufacturing device for manufacturing a metal powder includes a feed for supplying a molten metal, a fluid spout unit, and a course modification unit. The fluid spout unit further includes a channel and an orifice. The channel is provided below the feed, allowing passing of the molten metal supplied from the feed. The orifice is opened at a bottom end of the channel, spouting a fluid into the channel. The above course modification unit is provided below the fluid spout unit, and forcibly changes the traveling direction of a dispersion liquid. This dispersion liquid is composed of multiple fine droplets dispersed into the fluid. The above droplets are a resultant of a breakup caused by a contact between the molten metal and the fluid ejected from the orifice. Here, the dispersion liquid is transported so that the droplets is cooled and solidified in the dispersion liquid in order to manufacture the metal powder.

Abstract: A one-step process for synthesizing gold-copper bimetallic nanocubes. The process comprises the step of simultaneously reducing a copper II salt and a gold halide by 1,2-hexadecanediol in diphenyl ether, and 1-dodecanethiol as well as surfactants 1-adamantanecarboxylic acid and 1-hexadecylamine. The copper II salt may be copper (II) acetylacetonate, copper chloride, copper sulfate, or copper phosphate. The gold halide may be chloroauric acid, gold chloride, gold bromide, or tetrabromoauric acid. The reduction may occur at a temperature between about 160 and 180 degrees Celsius. The copper II salt may be copper (II) acetylacetonate and the gold halide may be chloroauric acid.

Abstract: A method is provided for producing a diffusion alloyed powder consisting of an iron or iron-based core powder having particles of an alloying powder containing Cu and Ni bonded to the surface of the core particles, comprising providing a unitary alloying powder capable of forming particles of a Cu and Ni containing alloy, mixing the unitary alloying powder with the core powder, and heating the mixed powders in a non-oxidizing or reducing atmosphere to a temperature of 500-1000° C. during a period of 10-120 minutes to convert the alloying powder into a Cu and Ni containing alloy, so as to diffusion bond particles of the Cu and Ni alloy to the surface of the iron or iron-based core powder. The alloying powder may be a Cu and Ni alloy, oxide, carbonate or other suitable compound that on heating will form a Cu and Ni alloy.

Abstract: This invention relates to thermal spray coatings, powders useful in deposition of the thermal spray coatings, methods of producing the powders, and uses of the thermal spray coatings, for example, coating of piston rings and cylinder liners of internal combustion engines. The coatings of this invention are applied by thermal spray deposition of a powder. The powder contains bimetallic carbides of chromium and molybdenum dispersed in a matrix metal. The matrix metal contains nickel/chromium/molybdenum.

Abstract: The Ultrafine alloy particles of an alloy includes a primary metal and one or more subsidiary metals solid-soluble in said primary metal, a content of the one or more subsidiary metals is in a range of 1 wt % to 25 wt % and the one or more subsidiary metals solid-solved in the primary metal inhibit coalescence or oxidation of the ultrafine alloy particles including the primary metal, or both. The process introduces powder materials including the primary metal and the one or more subsidiary metals for producing the ultrafine alloy particles into a thermal plasma flame under reduced pressure to form a vapor-phase mixture and introduces a cooling gas toward an end portion of the thermal plasma flame in a supply amount sufficient for quenching the vapor-phase mixture so as to generate the ultrafine alloy particles.

Abstract: Au—Pt heteroaggregate dendritic nanostructures and AuPt alloy nanoparticles, and their use as anodic catalysts in fuel cells.

Abstract: This invention is related to a powder of a tungsten alloy with a transition metal dissolved therein as a solid solution that is suitable as material for a cemented carbide represented by formula [1] and a material for a catalyst. The powder of tungsten alloy is characterized in that at least one transition metal element selected from the group consisting of cobalt, iron, manganese and nickel is dissolved as a solid solution in a tungsten grating and a peak derived from a bcc tungsten phase appears in an X-ray diffraction diagram. Formula [1]: M?W wherein M represents one or more elements selected from Co, Fe, Mn and Ni. The use of tungsten alloy powder can provide a tungsten carbide with a transition metal dissolved therein as a solid solution in which a solid solution phase comprising at least one transition metal element selected from the group consisting of cobalt, iron, manganese and nickel, tungsten and carbon is included in a tungsten carbide skeleton, and a tungsten carbide diffused cemented carbide.

Abstract: A target consisting essentially of a CoCrPt-based metal or a CoCrPtRu-based metal, and one or more metal oxides selected from the group consisting of SiO2, Cr2O3, CoO, TiO2 and Ta2O5, is heated in an upper crucible of a two-level crucible that includes the upper crucible with a through hole formed in a bottom surface, and a lower crucible disposed below the through hole. The target is heated at a temperature of from 1400 to 1790° C. if the target does not contain both TiO2 and Ta2O5. The target is heated at a temperature of from 1400 to 1630° C. if the target contains TiO2 but does not contain Ta2O5. The target is heated at a temperature of from 1400 to 1460° C. if the target contains Ta2O5. The metal thereby melted is caused to flow into the lower crucible, so that the metal is separated from the metal oxide.

Abstract: Provided are an ancillary material, used for shape processing, which is capable of shortening a processing time, avoiding a reduction in quality of a shape provided to a workpiece material, and allowing a relatively low manufacturing cost; a processing method using the ancillary material; and a method of manufacturing the ancillary material. The tungsten alloy grains (1) comprise: tungsten of greater than or equal to 80% by mass and less than or equal to 98% by mass; nickel; at least one kind of metal selected from the group consisting of iron, copper, and cobalt; and an inevitable impurity, a maximum diameter thereof is greater than or equal to 0.1 mm and less than or equal to 5.00 mm, and a specific surface area thereof is less than or equal to 0.02 m2/g. The tungsten alloy grains (1, 10), the workpiece material (30), an abrasive (20) are blended in a container (100) and the container is rotated, thereby processing the shape of the workpiece material (30).

Abstract: A metallic article is produced by furnishing one or more nonmetallic precursor compound comprising the metallic constituent element(s), and chemically reducing the nonmetallic precursor compound(s) to produce an initial metallic particle, preferably having a size of no greater than about 0.070 inch, without melting the initial metallic particle. The initial metallic particle is thereafter melted and solidified to produce the metallic article. By this approach, the incidence of chemical defects in the metal article is minimized. The melted-and-solidified metal may be used in the as-cast form, or it may be converted to billet and further worked to the final form.

Abstract: The invention relates to a method for preparation of a material adapted to reversible storage of hydrogen, including steps consisting of providing a first powder of a magnesium-based material, hydrogenating the first powder to convert at least part of the first powder into metal hydrides, mixing the first hydrogenating powder with a second powder additive, the proportion by mass of the second powder in the mix obtained being between 1% and 20% by mass, wherein the additive is formed from an alloy with a centred cubic structure based on titatnium, vanadium and at least one other metal chosen from chromium or manganese, and grinding the mix of first and second powders.

Abstract: A method of making metal nanostructures having a nanometer size in at least one dimension includes preparing an aqueous solution comprising a cation of a first metal and an anion, and mixing commercial elemental powder particles of an elemental second metal having a greater reduction potential than the first metal with the aqueous solution in an amount that reacts and dissolves all of the second metal and precipitates the first metal as metal nanostructures. The temperature and concentration of the aqueous solution and the selection of the anions and the second metal are chosen to produce metal nanostructures of a desired shape, for example ribbons, wires, flowers, rods, spheres, hollow spheres, scrolls, tubes, sheets, hexagonal sheets, rice, cones, dendrites, or particles.

Abstract: A method of manufacturing a hydrogen-absorption alloy electrode which comprises particles of a hydrogen-absorption alloy that comprises a rare earth element, Ni, Co and Al. The method comprises subjecting the hydrogen-absorption alloy particles to an alkaline treatment in a 10 to 50 weight % NaOH solution at 60 to 140° C. for 0.5 to 5 hours such that on the surface of the particles (amount of Al on surface/amount of Al in alloy)<(amount of Co on surface/amount of Co in alloy).

Abstract: The subject of the invention is the (50) continuous flow system for the synthesis of nanoparticles which consist of the (1a) feeding unit connected to the flow path, at least one (2) first reactor unit possessing the (13) heatable reactor-zone, the (3) second reactor unit which follows (2) in the same cascade; the (5) mixing unit and the (1b) second feeding unit between (2) and (3) reactor units, the (9) and (10) feeding pumps connected to the raw material source and/or (22) control unit which is capable of controlling at least one (18) pressure controller and/or controlling the temperature of at least one (13) heatable reactor-zone; each (13) heatable reactor-zone is followed by (14) cooling unit in the cascade. In addition, the subject of this invention is a process for the synthesis of nanoparticles, preferably metal-containing nanoparticles, and nanoparticles of biologically active organic molecules wherein the process is accomplished in the device according to FIG. 1.

Abstract: A process is described for the synthesis of metallic nanoparticles by chemical reduction of metal salts in the presence of organic ligands capable of binding to the metal particle surfaces and stabilizing them against agglomeration. The resultant nanoparticles or dispersions of the particles can be sintered into highly conductive films or traces at temperatures as low as 80° C. in 10 minutes or less.

Abstract: Bimetallic hybrid nanostructures exhibit enhanced properties beyond a single composition nanoparticle, but present technical challenges for synthesis that includes the ability to process two or more materials while offering control over structural arrangement. Unlike conventional synthetic strategies, biological systems are excellent manufacturers of complex inorganic materials which possess maximal functionality, quality, and structures. Using a bio-mediated approach, Applicants have developed a synthetic method for the controlled synthesis of bimetallic nanostructures using multifunctional peptides.

Abstract: The invention relates to a method of manufacturing metal nanoparticles by using metal seed and metal nanoparticles including such metal seed. It is to provide the Au nanoparticles prepared by a method comprising: preparing a solution by adding a monosurfactant into a non-aqueous solvent; heating the solution; preparing a platinum seed solution by adding platinum salt chosen form platinum, palladium, iridium into the heated solution; and adding gold salt in the platinum seed solution.

Abstract: An apparatus (10) and a method (200) for the manufacture of nanoparticles. The apparatus and the method allows for the nucleation and growth of nanoparticles at independent temperatures. The independent temperatures allow for the growth of nanoparticles in a controlled environment avoiding spontaneous nucleation and allowing particle sizes to be controlled and facilitating the manufacture of particles of a substantially uniform size. Furthermore the apparatus (10) allows for the manufacture of core-shell nanoparticles and core-shell-shell nanoparticles.

Abstract: Methods for functionalizing the surface of nanomaterials to improve processing and product manufacturing. These methods are useful for oxides, nitrides, carbides, borides, metals, alloys, chalcogenides, and other compositions.

Abstract: A process for encapsulating metal microparticles in a pH sensitive polymer matrix using a suspension containing the polymer. The process first disperses the metal particles in a polymeric solution consisting of a pH sensitive polymer. The particles are then encapsulated in the form of micro-spheres of about 5-10 microns in diameter comprising the pH sensitive polymer and the metal ions (Ni2+, Cu2+) to be coated. The encapsulated matrix includes first metal particles homogeneously dispersed in a pH sensitive matrix, comprising the second metal ions. A high shear homogenization process ensures homogenization of the aqueous mixture resulting in uniform particle encapsulation. The encapsulated powder may be formed using spray drying. The powder may be then coated in a controlled aqueous media using an electroless deposition process. The polymer is removed when the encapsulated micro-spheres encounter a pH change in the aqueous solution.

Abstract: The present invention relates to a method for manufacturing metal nanoparticles including: preparing a first solution including a metal precursor and a non-polar solvent; preparing a second solution with adding a capping molecule presented by the following Formula 1 into the first solution; and stirring the second solution with applying heat, wherein R1 and R2 are independently —COOH, —NH2 or —CH3 but R1 and R2 cannot be —COOH at the same time, and x and y is independently an integer from 3 to 20 respectively and x+y is 20 to 40.

Abstract: A method for the manufacture of a III-V compound in the form of nanoparticles, such as those used in semi-conductors. The reaction proceeds at atmospheric pressure in a reaction solution by the reaction of a III compound source and a V compound source. The reaction proceeds in solvent of high boiling point. The solvent contains a stabiliser and a base. The manufactured III-V compound is precipitated from the reaction solution, isolated, purified and analysed.

Abstract: A method for manufacturing alloy powders based on titanium, zirconium and hafnium alloyed with the elements Ni, Cu, Ta, W, Re, Os, and Ir is described in which an oxide of Ti and Zr and Hf is mixed with a metal powder of the elements named and with a reducing agent, and wherein this mixture is heated in a furnace, optionally under a argonate atmosphere or, optionally under hydrogen atmosphere until the reducing reaction begins, the reaction product is leached and then washed and dried, wherein the oxide used has an average grain size of 0.5 to 20 ?m, a specific surface area according to BET of 0.5 20 m2/g and a minimum content of 94 wet.-%. An easy to produce powder, in particular in relation to the ignition point and burning time, is produced.

Abstract: The present invention provides an alloy powder that is a material for producing inorganic functional materials such as phosphors, a phosphor with high brightness, and a method for producing the phosphor. An alloy powder for an inorganic functional material precursor contains at least one metal element and at least one activating element M1 and has a weight-average median diameter D50 of 5 ?m to 40 ?m. A method for producing a phosphor includes a step of heating an alloy, containing two or more metal elements for forming the phosphor, in a nitrogen-containing atmosphere.

Abstract: A method and a device are described for the production of metal powder or alloy powder of a moderate grain sizes less than 10 ?m, comprising or containing at least one of the reactive metals zirconium, titanium, or hafnium, by metallothermic reduction of oxides or halogenides of the cited reactive metals with the aid of a reducing metal, wherein said metal powder or alloy powder is phlegmatized by adding a passivating gas or gas mixture during and/or after the reduction of the oxides or halogenides and/or is phlegmatized by adding a passivating solid before the reduction of the oxides or halogenides, wherein both said reduction and also said phlegmatization are performed in a single gas-tight reaction vessel which can be evacuated.

Abstract: The present invention relates to a method for manufacturing metal nanoparticles, more particularly to a method for manufacturing metal nanoparticles, which includes: preparing a mixed solution including capping molecules, a metal catalyst, a reducing agent, and an organic solvent; adding a metal precursor to the mixed solution and raising to a predetermined temperature and stirring; and lowering the temperature of the mixed solution and producing nanoparticles. Embodiments of the invention allow the synthesis of nanoparticles, such as of single metals, metal alloys, or metal oxides, to a high concentration in a water base using a metal catalyst.

Abstract: A metallic article is produced by furnishing one or more nonmetallic precursor compound comprising the metallic constituent element(s), and chemically reducing the nonmetallic precursor compound(s) to produce an initial metallic particle, preferably having a size of no greater than about 0.070 inch, without melting the initial metallic particle. The initial metallic particle is thereafter melted and solidified to produce the metallic article. By this approach, the incidence of chemical defects in the metal article is minimized. The melted-and-solidified metal may be used in the as-cast form, or it may be converted to billet and further worked to the final form.

Abstract: A method of producing passivated Ti or Ti alloy particles with oxygen concentrations of less than about 900 parts per million (ppm), which includes introducing a halide vapor of Ti or the metal constituents of the alloy at sonic velocity or greater into a stream of liquid alkali or liquid alkaline earth metal or mixtures thereof forming a reaction zone in which the halide is reduced by the liquid metal present in sufficient excess of stoichiometric such that Ti or Ti alloy powder from the reduction of the halide by the liquid metal is friable. After filtration and distillation excess liquid metal is removed from the Ti or Ti alloy powder that is then maintained at elevated temperature for a time sufficient to grow the particles to average diameters calculated from BET surface area measurement greater than about one micron. After cooling the Ti or Ti alloy powder to temperature of about 80° C.

Abstract: A process for producing refractory metal alloy powders includes the steps of blending at least one powder with at least one solvent and at least one binder to form a slurry; forming a plurality of agglomerates from the slurry; screening the plurality of agglomerates; sintering the plurality of agglomerates; and melting said plurality of agglomerates to form a plurality of homogenous, densified powder particles.

Abstract: A powder batch is described comprising single crystal metal-containing particles having a crystal size of less than 50 nm as measured by X-ray diffraction and having a weight average particle size of from about 10 nanometers to less than 100 nanometers as measured by transmission electron microscopy and including a continuous or non-continuous coating of a ceramic material. The powder batch is preferably produced by flame spraying.

Abstract: The present invention provides a method for preparing nanoparticles of group IV elements, particularly nanoparticles of Si, Ge and Sn, and binary and ternary alloys of these elements. The method comprises the solution-phase decomposition of one or more group IV metal precursors at elevated temperature and under an inert atmosphere at atmospheric pressure, using a decomposition-promoting reagent. A surface-bonding agent is added to the reaction mixture to form an organic layer surrounding the nanoparticles and prevent aggregation.

Abstract: An article made of a metallic material having its constituent elements is made by furnishing at least one nonmetallic precursor compound, wherein all of the nonmetallic precursor compounds collectively include the constituent elements of the metallic material in their respective constituent-element proportions. The precursor compounds are chemically reduced to produce particles comprising the metallic material, without melting the precursor compounds and without melting the metallic material. The particles may be consolidated into a rod, which may be used as a welding rod in a welding operation. Alternatively, the nonmetallic precursor compounds may be consolidated prior to the chemical reduction.

Abstract: The producing unit for continuously producing metal microparticles formed of a multicomponent alloy accompanied by the generation of a byproduct gas through an early reaction of the formation of the metal particles comprises a first mixing unit for continuously supplying and mixing a plurality of solutions for conducting the early reaction, a second mixing unit for continuously supplying another solution to the reaction liquid containing the metal microparticles formed in the early reaction and for mixing the two solutions, to introduce dissimilar metal atoms into the crystal lattices of the metal microparticles, and a gas-liquid separation unit that is installed in a midway of the pipe which is made so as to have enough length to finish the early reaction, and which continuously passes the reaction liquid to the second mixing unit from the first mixing unit, and that continuously removes the byproduct gas generated with the proceeding of the early reaction.

Abstract: Compositions are disclosed comprising mercury, titanium, copper and one or more of tin, chromium and silicon, useful for the release of mercury in applications requiring the same, in particular in fluorescent lamps. A process for the preparation of these compositions is also disclosed.

Abstract: The present invention aims to provide a method for producing a dispersion of metal nanoparticles which enables to control the shape and the particle diameter over a wide range, a dispersion of metal nanoparticles having superior dispersion stability, and a method for producing the same. In addition, the present invention further aims to provide a dispersion of metal nanoparticles which has a volume resistivity of 2×10?6 to 6×10?6 ?·cm and is suitable for use as an electrically conductive material, and a method for producing the same. Moreover, the present invention further aims to provide a method for synthesizing metal nanoparticles which can produce metal nanoparticles suitable for use as electrically conductive materials by synthesizing the metal nanoparticles from a insoluble metal salt which is free of corrosive materials.

Abstract: A melt of nickel nitrate hydrate is introduced as droplets or liquid flow into a heated reaction vessel and thermally decomposed in a gas phase at a temperature of 1200° C. or more and at an oxygen partial pressure equal to or below the equilibrium oxygen pressure of nickel-nickel oxide at that temperature to manufacture a highly crystalline fine nickel powder with an extremely narrow particle size distribution. The oxygen partial pressure during the thermal decomposition is preferably 10?2 Pa or less, and a metal other than nickel, a semimetal and/or a compound of these may be added to the nickel nitrate hydrate melt to manufacture a highly crystalline nickel alloy powder or highly crystalline nickel composite powder. The resultant powder is suited in particular to thick film pastes such as conductor pastes for manufacturing ceramic multilayer electronic components.

Abstract: The present invention provides high quality monodisperse or substantially monodisperse InAs nanocrystals in the as-prepared state. In some embodiments, the as-prepared substantially monodisperse InAs nanocrystals demonstrate a photoluminescence of between about 700 nm and 1400 nm.

Abstract: A vaporised flow quenching reactor for producing a fine-powder from one or more reactant materials. The reactor comprises a first heat source selected from one of a DC plasma torch and RF plasma torch, a first reaction chamber within which energized reactant materials react and a first convergent-divergent nozzle for quenching the heated reactant materials from the first reaction chamber. The reactor also comprises a second reaction chamber provided for congregation of nano particles formed therefrom and a second convergent-divergent nozzle to deliver the nano particles to a collection chamber.

Abstract: The invention relates to novel pre-alloyed metal powders a method for production and use thereof.

Abstract: A diffusion alloyed iron powder is provided wherein tungsten W is bonded to the surfaces of the particles of an iron or iron-based powder, and wherein the diffusion alloyed iron powder comprises by weight-%: 30-60 W, with the balance being essentially only iron and unavoidable impurities.

Abstract: Synthesis of nanoparticles with particle size control is provided by the method of using two different metal-containing precursors, a capping component, an optional reducing agent, and then contacting the two precursors with the capping component to form a reaction solution, which is heated to produce first and second metals-containing nanoparticles. By controlling the ratio of the concentration of the capping component to the total concentration of the two metal-containing precursors, the nanoparticles can have diameters ranging between about 1 nm to about 15 nm. A decrease in the concentration of the capping component typically increases the size of the nanoparticles. Preferred compositions include Pt and Co-containing alloy nanoparticles. Controlled synthesis of larger, about 6 nm to about 12 nm, sized nanoparticles can be achieved in a solvent-free reaction process.