摘要:
A liquid dispersion of metal nanoparticles for solder paste comprises metal nanoparticles made of an alloy and a reducing dispersion medium, wherein the metal nanoparticles have an average particle diameter of 1.0 to 200 nm, the metal nanoparticles have a sintering initiation temperature of less than 50° C., and the liquid dispersion comprises substantially no surfactant or surface modifier.
摘要:
The present invention relates to a technique for recovering and recycling a platinum paste. The present invention provides a method for recovering a metal powder from a platinum paste formed by mixing a solid component composed of a metal powder including at least a platinum powder or a platinum alloy powder and an organic component including at least an organic solvent, the method including removing the organic component by heating the platinum paste at a recovery temperature set in a temperature range of 300° C. or higher and 500° C. or lower. The recovered metal powder can be recycled into a platinum paste equivalent to a new product by mixing the metal powder with a solvent etc.
摘要:
The present invention relates to novel gold nanocrystals and nanocrystal shape distributions that have surfaces that are substantially free from organic impurities or films. Specifically, the surfaces are “clean” relative to the surfaces of gold nanoparticles made using chemical reduction processes that require organic reductants and/or surfactants to grow gold nanoparticles from gold ions in solution. The invention includes novel electrochemical manufacturing apparatuses and techniques for making the gold-based nanocrystals. The invention further includes pharmaceutical compositions thereof and the use of the gold nanocrystals or suspensions or colloids thereof for the treatment or prevention of diseases or conditions for which gold therapy is already known and more generally for conditions resulting from pathological cellular activation, such as inflammatory (including chronic inflammatory) conditions, autoimmune conditions, hypersensitivity reactions and/or cancerous diseases or conditions In one embodiment, the condition is mediated by MIF (macrophage migration inhibiting factor).
摘要:
A method for producing a metal nanoparticle composition including: (a) providing an alloy that includes silver and aluminum; (b) subjecting the alloy to a first thermal treatment to form a thermally treated alloy; (c) cold working the thermally treated alloy to form strips or pellets comprising the alloy; (d) subjecting the strips or pellets to a second thermal treatment at a temperature less than 440° C. to form thermally treated strips or pellets; (e) subjecting the thermally treated strips or pellets to a leaching agent effective to leach out a portion of the aluminum and form a metal nanoparticle composition comprising metal nanoparticles; and (f) washing, filtering, and then drying the metal nanoparticle composition.
摘要:
In one aspect, hollow nanoparticles are described herein. In some embodiments, a hollow nanoparticle comprises a metal shell and a cavity substantially defined by the shell, wherein the shell has a thickness greater than or equal to about 5 nm and the cavity has a curved surface. In another aspect, methods of making hollow nanoparticles are described herein. In some embodiments, a method of making hollow nanoparticles comprises forming a plurality of gas bubbles and forming a shell on the surface of at least one of the plurality of gas bubbles, wherein at least one of the gas bubbles is electrochemically generated. In another aspect, composite particles are described herein. In some embodiments, a composite particle comprises at least one nanoparticle and a polycrystalline metal shell substantially encapsulating at least one nanoparticle, wherein at least one surface of at least one nanoparticle is not in contact with the shell.
摘要:
Methods of producing metal nanowires, compositions, and articles are disclosed. Such methods allow production of metal nanowires with reproducibly uniform diameter and length, even in the presence of catalyst concentration variation. Such metal nanowires are useful for electronics applications.
摘要:
Described are thin plane-parallel aluminum flakes illustrated in FIG. 1 having a thickness of up to 200 nm and comprising an inner layer of oxidized aluminium having a thickness of 0.5-30 nm, a process for the manufacture thereof and the use thereof, e.g. in formulations, like paints, electrostatic coatings, printing inks, plastics materials, and cosmetics. Surprisingly, due to the inner layer of oxidized aluminum the aluminum flakes have an improved shear stability as evidenced e.g. by the difference in lightness before and after shear stress.
摘要:
In one aspect, hollow nanoparticles are described herein. In some embodiments, a hollow nanoparticle comprises a metal shell and a cavity substantially defined by the shell, wherein the shell has a thickness greater than or equal to about 5 nm and the cavity has a curved surface. In another aspect, methods of making hollow nanoparticles are described herein. In some embodiments, a method of making hollow nanoparticles comprises forming a plurality of gas bubbles and forming a shell on the surface of at least one of the plurality of gas bubbles, wherein at least one of the gas bubbles is electrochemically generated. In another aspect, composite particles are described herein. In some embodiments, a composite particle comprises at least one nanoparticle and a polycrystalline metal shell substantially encapsulating at least one nanoparticle, wherein at least one surface of at least one nanoparticle is not in contact with the shell.
摘要:
A protective passivation layer is formed on the surface of an aluminum mass, such as bare aluminum particles, creating a protected aluminum mass. Formation of the protective layer onto the aluminum mass may occur from an in-situ process.
摘要:
In a system and method for producing ultrafine particles and ultrafine fibers of a given source material by evaporating and condensing the material in a gas atmosphere that includes inert gas. A smaller, more narrow size distribution is accomplished by producing the particles and fibers in a microgravity environment in order to reduce particle coalescence caused by convection currents. Particle coalescence also is reduced in an Earth gravity environment by controlling the convection currents. Condensed particles are collected either by providing an electrostatic field or a spatially varying magnetic field or by causing the gas to move through a filter which collects the particles. Nonferromagnetic material fibers are produced and collected by electrodes which produce an electro- static field. Ferromagnetic particles are collected by spatially varying magnetic fields.