Patent application number | Description | Published |
20080213592 | Method of Manufacturing Silver Platelets - 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. | 09-04-2008 |
20080305353 | Aqueous-Based Method For Producing Ultra-Fine Metal Powders - The present invention provides a method for forming compositions having a plurality of ultra-fine metallic particles, and the metallic composition produced therewith. Also provided is a substrate coated with the plurality of ultra-fine metallic particles obtained in accordance with the method of the present invention. | 12-11-2008 |
20100086832 | CORE / SHELL-TYPE CATALYST PARTICLES AND METHODS FOR THEIR PREPARATION - The invention discloses core/shell type catalyst particles comprising a M | 04-08-2010 |
20100092841 | CORE / SHELL-TYPE CATALYST PARTICLES COMPRISING METAL OR CERAMIC CORE MATERIALS AND METHODS FOR THEIR PREPARATION - The invention is directed to core/shell type catalyst particles comprising a M | 04-15-2010 |
20100167051 | Process for Manufacture of Silver-Based Particles and Electrical Contact Materials - The invention is directed to a process for manufacture of fine precious metal containing particles, specifically silver-based particles and silver-based contact materials via an intermediate silver(+1)-oxide species. The process comprises in a first step the formation of a thermally instable silver (+1)-oxide species by adding a base to an aqueous silver salt solution comprising an organic dispersing agent. Due to the presence of the organic dispersing agent, the resulting silver (+1)-oxide species is thermally instable, thus the species is decomposing to metallic silver at temperature lower than 1000° C. The process optionally may comprise the addition of a powdered compound selected from the group of inorganic oxides, metals, and carbon-based compounds. Furthermore the process may contain additional separating and drying steps. The process is versatile, cost efficient and environmentally friendly and is used for the manufacture of silver-based particles and electrical contact materials. Silver nanoparticles made according to the process are characterized by a narrow particle size distribution. Electrical contact materials manufactured according to the process reveal improved contact welding properties. | 07-01-2010 |
20100190641 | Method for manufacture of noble metal alloy catalysts and catalysts prepared therewith - The present invention provides a method for manufacture of supported noble metal based alloy catalysts with a high degree of alloying and a small crystallite size. The method is based on the use of polyol solvents as reaction medium and comprises of a two-step reduction process in the presence of a support material. In the first step, the first metal (M1 =transition metal; e.g. Co, Cr, Ru) is activated by increasing the reaction temperature to 80 to 160° C. In the second step, the second metal (M2=noble metal; e.g. Pt, Pd, Au and mixtures thereof) is added and the slurry is heated to the boiling point of the polyol solvent in a range of 160 to 300° C. Due to this two-step method, an uniform reduction occurs, resulting in noble metal based catalysts with a high degree of alloying and a small crystallite size of less than 3 nm. Due to the high degree of alloying, the lattice constants are lowered. The catalysts manufactured according to the method are used as electrocatalysts for polymer electrolyte membrane fuel cells (PEMFC), direct-methanol fuel cells (DMFC) or as gas phase catalysts for CO oxidation or exhaust gas purification. | 07-29-2010 |
20110064825 | Method for preparing dispersions of precious metal nanoparticles and for isolating such nanoparticles from said dispersions - The present invention is directed to a method for preparing colloidal dispersions of precious metal nanoparticles selected from the group consisting of Pt, Au, Pd, Ag, Rh, Ru and mixtures or alloys thereof, and to a method for isolating such precious metal nanoparticles from these colloidal dispersions. The colloidal dispersions are prepared by reducing suitable precious metal precursor compounds in aqueous alkaline solutions at reaction temperatures between 40 and 70° C. and a pH≧12.0 in the presence of polysaccharides with average molecular weights (M | 03-17-2011 |
20110086295 | CORE / SHELL-TYPE CATALYST PARTICLES AND METHODS FOR THEIR PREPARATION - The invention discloses core/shell type catalyst particles comprising a M | 04-14-2011 |
20120058888 | Method for manufacture of noble metal alloy catalysts and catalysts prepared therewith - The invention provides a method for manufacturing supported noble metal based alloy catalysts with a high degree of alloying and a small crystallite size. The method involves using polyol solvents as reaction medium and comprises a two-step reduction process in the presence of a support material. In the first step, the first metal (transition metal; e.g. Co, Cr, Ru) is activated by increasing the reaction temperature to 80 to 160° C. In the second step, the second metal (noble metal; e.g. Pt, Pd, Au) is added and the slurry is heated to the boiling point of the polyol solvent in a range of 160 to 300° C. The catalysts manufactured according to the method are used as electrocatalysts for polymer electrolyte membrane fuel cells (PEMFC), direct-methanol fuel cells (DMFC) or as gas phase catalysts for CO oxidation or exhaust gas purification. | 03-08-2012 |
20120238443 | MANUFACTURE OF BASE METAL NANOPARTICLES USING A SEED PARTICLE METHOD - The present invention is directed to a process for manufacture of base metal nano-particles using precious metal seed particles. | 09-20-2012 |
20120316054 | CORE / SHELL-TYPE CATALYST PARTICLES AND METHODS FOR THEIR PREPARATION - The invention discloses core/shell, type catalyst particles comprising a M | 12-13-2012 |
20130277623 | PROCESS FOR THE SURFACE MODIFICATION OF A POLYMER PARTICLE - A process for the preparation of an activated polymer particle comprising contacting a polymer particle with at least one polyamine, wherein said polyamine has three or more amino groups, to form a surface treated polymer particle; and applying a catalyst to the surface treated polymer particle to form an activated polymer particle. | 10-24-2013 |
20130323115 | METHOD OF MANUFACTURING SILVER PLATELETS - The present invention provides an aqueous solution-based method for producing nano-sized silver platelets, which employs the controlled mixing of a silver ion solution, a reducing solution, and an acidic solution, under suitable conditions. Also provided are the silver platelets produced thereby, and compositions containing the silver platelets. | 12-05-2013 |
20140171290 | Catalyst particles comprising a layered core-shell-shell structure and method of their manufacture - The present invention is directed to catalyst particles comprising a layered core-shell-shell structure and to a method of their manufacture. The catalyst particles have the general formula BM/IL/PM in which BM is a base metal core (selected from Co, Ni or Cu), PM is a precious metal outer shell (selected from Pt, Ir or Pd) and IL is an intermediate layer comprising a base metal/precious metal alloy with a concentration gradient of base metal to the outside PM layer. The particles of the present invention comprise a core-shell-shell structure and a substantially continuous precious metal shell layer. They find use in various catalytic applications, for example in gas-phase catalysis, in electrocatalysts for fuel cells, in catalytic converters for automobiles and in electronic or medical applications. | 06-19-2014 |
20140171297 | Catalyst particles comprising hollow multilayered base metal-precious metal core/shell particles and method of their manufacture - The present invention is directed to hollow catalyst particles comprising a layered shell structure and to a method of their manufacture. The catalyst particles have the general formula H | 06-19-2014 |
20140234220 | METHOD AND COMPOSITION FOR DISPERSIONS OF GOLD NANOPARTICLES - The present disclosure relates to a method for making a gold nanoparticle dispersion. The method includes providing a first solution that has gold ions in a liquid medium, adding NTA molecules to the first solution to form a gold nanoparticle dispersion. When the NTA molecules are added to the first solution, the NTA molecules act as a reducing agent to reduce the gold ions to gold atoms, after which the gold atoms nucleate to form gold nanoparticles. The excess NTA molecules then attach to the surface of the gold nanoparticles to stabilize the dispersion. The present disclosure also relates to a dispersion composition that includes a liquid medium, gold nanoparticles dispersed throughout the liquid medium, and NTA molecules directly coating the gold nanoparticles. | 08-21-2014 |
20140315086 | Positively Charged Silicon for Lithium-Ion Batteries - This invention relates to a negative electrode material for lithium-ion batteries comprising silicon and having a chemically treated or coated surface influencing the zeta potential of the surface. The active material consists of particles or particles and wires comprising a core ( | 10-23-2014 |