Property of ultrafine and nano-silver powders
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 the electronics sector. 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 physical-chemical properties, nanosilver powder has been widely used in immunoassays as well as sensor development and molecular electronic research. In addition, nanosilver can enhance the properties of certain products made from chemical fiber and increase their sterilization capability. 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 mm. Ultrafine silver powder has an average particle width of 0.5-10m. Fine and ultrafine are the two main types.
The preparation method for superfine silver powder or nano silver powder.
The three most common methods for ultrafine powder preparation are the gas phase method (or liquid phase) and the reliable phase method (or both). Low yield, large energy costs and large investments are all associated with the gas-phase method. However, ultrafines silver 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 batches preparation of ultrafines silver powder.
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, complex aqueous solutions or organic 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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