8 results about "Metal colloids" patented technology

The present invention relates to a metal powder containing a metal of Au, Ag, Cu, or an alloy thereof, having an average particle size of 0.1 μm or more and 0.4 μm or less, and purity of 99.9% by mass or more. In this metal powder, a presence ratio, in terms of the number of particles, of non-spherical particles in the metal powder having a ratio (b / a) of a minor axis “a” and a major axis “b” of 3 or more is 1% or less. As a method for producing such a metal powder, in a wet reduction method including a metal colloid synthesis step and a metal powder granulation step of granulating metal colloidal particles into a metal powder, surfactants having alkyl groups having carbon numbers falling within specified ranges are preferably used as first and second dispersants in the metal colloid synthesis step and the metal powder granulation step.

The invention relates to the technical field of glass cover plates, and provides a glass cover plate, a preparation method of the glass cover plate and electronic equipment, the glass cover plate is prepared from photosensitive glass, photosensitive metal ions in the glass cover plate can be reduced into photosensitive metal atoms, and the photosensitive metal atoms can be reduced into photosensitive metal atoms. The photosensitive metal atoms gather in the photosensitive glass to form the photosensitive metal colloid particles with different concentrations, the photosensitive metal colloid particles have certain sizes, and the photosensitive metal colloid particles with certain sizes and different concentrations present different colors, so that the glass cover plate can present colorful colors, and the service life of the glass cover plate is prolonged. And the photosensitive metal colloid particles are formed in the glass cover plate, so that the influence of the external environment can be isolated, and the color on the glass cover plate is more stable and durable.

The present invention relates to a method for preparing a metal (copper, molybdenum, zinc, magnesium, silver) colloidal solution using resonant vibration particle separation and cryogenic freezing technology, which is suitable for multiple fields such as engineering, biology and medicine. The present invention proposes a method for preparing a colloidal solution of any one of copper, molybdenum, zinc, magnesium or silver. According to the present invention, the cleaned metal blank is placed in distilled water or deionized water, and a resonant acoustic treatment is performed using an ultrasonic generator, thereby forming metal nanoparticles. Subsequently, the particles are subjected to cryogenic freezing treatment, followed by controlled cryogenic thawing, to obtain a stable metal colloidal solution with a particle size of 1-10 nm. The proposed method can generate nanoparticles of 5 to 50 nanometers in the resonant fragmentation stage, and can be further reduced to 1-10 nanometers during the cryogenic freezing process. This method can achieve a high-stability colloidal solution without the use of chemical stabilizers, avoid the production of toxic byproducts, and extend the storage period of the colloidal solution to 1 year.

[Problem] To provide: an MIM-type SPR measurement substrate that does not require a complicated pattern forming technique, that is easily manufactured, and that has high detection sensitivity; and a method for manufacturing the same. [Solution] A substrate on which a metal oxide layer having 4 or more and less than 8 isoelectric points is formed on a metal film is prepared (substrate preparation step S1). A three-dimensional charged colloidal crystal dispersion, in which charged colloidal crystals composed of metal particles are dispersed in a dispersion medium, and the sign of the surface charge of the charged colloidal crystals is the same as that of the surface charge of the metal oxide layer, is prepared (colloidal crystal dispersion preparation step S2). After the charged colloidal crystal dispersion is brought into contact with the metal oxide layer, the surface charge of the metal oxide layer is adjusted so that the sign thereof is different from that of the surface charge of the three-dimensional charged colloidal crystals, and two-dimensional charged metal colloidal crystals are transferred onto the metal oxide layer (transfer step S3).

The invention relates to hollow-structure micro-nano silver powder and a preparation method and application thereof. The preparation method comprises the following steps that (1) gas is introduced into a nano-metal colloidal solution for gas adsorption; (2) mixing the nano-metal colloidal solution obtained in the step (1), silver salt and a surface dispersing agent, and continuously introducing gas to obtain a micro-nano silver powder precursor; and (3) the micro-nano silver powder precursor and a reducing agent are mixed for a reduction reaction, and the hollow-structure micro-nano silver powder is obtained. The hollow structure is ingeniously formed in the silver powder material in the silver nitrate liquid-phase reduction process through the gas adsorption-desorption process of the nano metal colloidal solution, and the preparation method has the advantages of being simple in process, low in manufacturing cost, low in energy consumption, stable in product structure and environmentally friendly. The micro-nano silver powder with the hollow structure is narrow in particle size distribution, high in activity and low in sintering temperature, and has great application value in the fields of solar photovoltaics, 5G electronics and the like.

This metal-containing colloidal silica has a mixture layer obtained by dispersing a metal M in silica. The mixture layer is positioned between silica particles serving as a core and a silica layer located on the surface of the metal-containing colloidal silica. The metal M is at least one type of element selected from Au, Ag, Cu, Zn, Ti, Pt, Mg, Zr, Fe, Sr, Ca, V, Mo, Bi, Nb, Ga, Ge, Sn, Ba, W, Co, Ni, and Mn. The molar ratio (Si / M) of silicon to the metal M in a coating layer obtained by combining the mixture layer and the silica layer is 10-10,000. The metal M is uniformly and finely dispersed in the mixture layer.

The invention provides welding equipment and method, and the welding equipment comprises a film pressing mechanism which comprises a bottom plate, a top plate and a connecting table; the polymer heating mechanism comprises a mounting plate, a heating cavity and two hot air supply assemblies, the heating cavity is formed in the mounting plate, and the two hot air supply assemblies are arranged on the two opposite sides in the thickness direction of the heating cavity correspondingly and communicate with the heating cavity; and the metal activation mechanism comprises a supporting table and a metal activation assembly, the metal activation assembly comprises a graphene heating module, and the metal to be connected is arranged in the graphene heating module in a penetrating mode. Compared with a conventional connection technology, local hot melting of the polymer, directional activation of the metal colloid and flexible press-fit solidification are integrated, the problems of overheat deformation of the polymer and metal heat loss are avoided, a filling gap between an interface and the colloid is reinforced and connected, the processing quality and strength of a product are remarkably improved, and the service life of the product is prolonged. And a new thought is provided for connection processing of different base material structures.