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 0.15m2/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 macro-quantum effects as well as surface and small size 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 widely used as a catalyst and ultra-low temperature refrigerator diluteents. 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 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 a large particle and wide particle distribution.

The liquid phase chemical reduction is a method that uses a reducing compound to deposit the silver from a salt, complex aqueous system or organic system into powder form. Ascorbic Acid, Glycerin and Organic Amines, Unsaturated Alcohols, Sodium Citrate, Hydrazine or hydrazine compound are some of the common reducing agent used. Hydrazine hydrate, in general, is used. Addition of nitrate to silver ammonia is done in the aqueous silver solution. With the help of the hydrazine hydrohydrate, the additive amount is adjusted in order to get a different size 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 narrow particle size range and high reproducibility.

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