Preparation Method of Superfine Silver Powder and Nano Silver Powder


Jul 28, 2023

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Property of nano and superfine silver particles:
The particle morphology in ultrafine particles Silver Powder The spherical, dendritic and cubic microcrystalline are 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, filtering, and drying. The average particle is less than 0.5mm. The surface area of the particles is between 0.1 to 5m2/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.

Ultrafine silver is used widely in the electronic industry. Nanosilver nanoparticles A unique structure of nanosilver particles allows them to have quantum size effects as well as surface and macro-quantum effects. This gives them physical and chemical properties which are different from traditional materials. 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 used for its high surface activity as well as catalytic performance in ultra-low temperature refrigerator dilutes. It is used widely in molecular electronic, immunoassays, and sensor development due to its unique physical-chemical properties. Addition of nanosilver in chemical fibres can also improve their specific properties and enhance their sterilization abilities. There are four types of ultrafine silver: spherical (or rounded), flocculent (or dendritic), and flakelike. According to their particle size, they can be divided as follows: fine silver with a particle size between 10-40mm, ultrafine with 0.5-10mm, Fine silver with a particle size below 0.5mm, Nano silver with 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 a large particle-size and a broad-sized particle distribution.

The liquid phase chemical reduction is a method that uses a reducing compound to deposit the silver from its complex solution in aqueous form or an organic system. Some of the most commonly used reducing substances are formaldehyde (ascorbic acid), glycerin (organic amines), sodium citrate (unsaturated alcohols), hydrazine or hydrazine compound, etc. Hydrazine hydrate, in general, is used. Addition of a small amount of additive Nitrate to silver ammonia is done in the aqueous solution. With the help of hydrazine, a reducing agent, the amount is adjusted in order to get a different size of silver powder. The amount of nitrates added can be determined by the requirement. The silver powder produced by this method is characterized by a small particle, a short range of particle size and high reproducibility.

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