Property of ultrafine and nano-silver powder:
Particle morphology for ultrafine gold powder is spherical to dendritic and flake-like. The silver nitrate has been mixed with ammonia and water. It can be obtained by adding dispersant to it, as well as adding hydrazine. Average particle size is 0.25 mm. Specific surface area of the silver nitrate is 0.15 m2/g. The silver oxide reduction process can be used with formaldehyde. Convert silver nitrate in silver carbonate and add triethanolamine for molecular reduction.
Ultrafine silver is essential in electrical and electronic industries. This is the most widely-used type of precious metal powder in electronics. Because of their unique structure, are able to produce small effects, quantum-size effects, surface effects, and macro-quantum Tunnelling effects. They also have chemical and physical properties that other materials lack. These nanosilver particle are essential for fundamental theoretical research and play a prominent role in fields such as surface enhancement of Raman spectroscopy and surface-enhanced reflection scattering.
High surface activity, high catalytic and wide use of nanosilver in catalysts is a common reason for using it. Because of its unique chemical, physical, and biological properties, nanosilver powder has been widely used in immunoassays as well as sensor development and molecular electronic research. Addition of nanosilver to chemical fiber can enhance the properties of certain products as well as make them more sterilizable. The ultrafine-silver powder can be classified into spherical or flake-like forms based on its shape. Ultrafine silver powder has an average particle diameter of 10-40 m. Fine silver powder is 0.5-10m. Nano silver powder has a particle dimension of 0.01 m.
The preparation method for superfine silver powder or nano silver powder.
There are several preparation options for fine silver powder. These include liquid phase method, gas phase method, and reliable phase. Low yield, large energy costs and large investments are all associated with the gas-phase method. However, ultrafine powder obtained by the reliable method has an extremely large particle size. Liquid phase chemical reduction is a popular method of low cost and small batch preparations.
To prepare ultrafine silver powder, you will need a liquid phase chemical reduce method. This involves using a reducing agents to remove silver from salt or complex organic solutions or systems. The most common reducing agents are formaldehyde (or ascorbic acid), glycerin or organic amines, unsaturated alks, sodium citrate and hydrazine. Hydrazine is generally used. An additive nitrate (or silver ammonia aqueous) is also added. To obtain silver powder of different sizes, an additive nitrate is added to the solution. You can use one or more nitrate additions. It is up to you how much. This process produces silver powder that is small in size with good reproducibility and wide distribution.
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