Preparation Method of Superfine Silver Powder and Nano Silver Powder

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Property of nano and superfine silver particles:
The particle morphology in ultrafine particles Silver Powder The spherical, flake and cubic microcrystalline, as well the dendritic flakes, is included. After silver nitrate has been complexed with the ammonia-water, it can be obtained by adding dispersant and hydrazine to reduce, then washing with water, filtration, and drying. The average particle is less than 0.5mm. Surface area is 0.15m2/g. The silver oxide reduction method can also be used with formaldehyde. Then convert silver nitrate in silver carbonate and add triethanolamine for the reduction method.

It is used widely in the electronics and electrical industries. Nanosilver nanoparticles A unique structure of nanosilver particles allows them to have many different effects. These include surface effects, macro-quantum tunnelling, quantum size effects and small size effects. Nanosilver particle occupy an important position in surface-enhanced Raman and resonance scattering spectroscopy as well as molecular biology. They are also essential for basic theoretical research.

Nanosilver powder is widely used as a catalyst and as diluents for ultra-low temperatures refrigerators. It is used widely in molecular electronic, immunoassays, sensor research, and other applications due to its unique physical-chemical properties. Addition of nanosilver in chemical fibre can also improve its sterilization properties. There are four types of ultrafine silver: spherical (or rounded), flocculent (or dendritic) and flake-like. According to their shape, they can be classified into fine silver with an average size of 10-40mm, ultrafine with an average size of 0.5-10mm, Fine silver with an average size of 0.5mm, Nano silver with a particle size less than 0.1mm.
Superfine silver powder preparation method and nano silver powder preparation:

Preparation methods for Ultrafine silver powder The main methods include the gas phase method, the liquid phase method, and the reliable phase method. The gas phase process is expensive, has high energy consumption, and produces a low yield. The ultrafine silver prepared using the reliable phase method also has large particles and a broad distribution of particle sizes.

The liquid phase chemical reduction is a method that uses a reducing compound to deposit the silver from a complex aqueous system or an organic system. Commonly used reducing agent include formaldehyde ascorbic, glycerin organic amines unsaturated alcohols sodium citrate, hydrazine or hydrazine compound. Hydrazine hydrate, in general, is used. Addition of additive nitrate to silver ammonia is done in the aqueous solution. With the help of the reducing agent, hydrazine hydrochloride, the amount is adjusted in order to get a different size of silver powder. The amount of nitrates added can be determined according to the requirement. The silver powder produced by this method is characterized by a small particle, a narrow particle size range and high reproducibility.

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