The particle morphology in ultrafine particles Silver Powder The spherical, flake and cubic microcrystalline, dendritic, flakes, and cubical forms are all included. Silver nitrate obtained after complexing with ammonia is obtained using dispersant and hydrazine. The average particle is less than 0.5mm. The surface area of the particles 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.
Ultrafine silver is used widely in the electronic industry. Nanosilver nanoparticles A unique structure of nanosilver particles allows them to have a variety of effects including surface effects, macro-quantum effects, and quantum size effects. They also have unique chemical and physical properties not found in 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 diluteent due to its high surface activity. 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.
Preparation methods for Silver powder ultrafine 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 ultrafine silver powder from its salt, complex aqueous solutions or organic systems. Other reducing substances include ascorbic acid and glycerin. Hydrazine hydrate, in general, is used. Addition of 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 according to the requirement. This method yields silver powder that has a very small particle size. The particle size range is short and the reproducibility is good.
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