Property of nano and superfine silver particles:
The particle morphology in ultrafine particles
Silver Powder
The spherical, dendritic and cubic microcrystalline are included. Silver nitrate obtained after complexing with ammonia is obtained using dispersant and hydrazine. 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.
Ultrafine silver is used widely in the electronic industry.
Nanosilver nanoparticles
A unique structure of nanosilver particles allows them to have effects such as small size, quantum size, surface and macro-quantum effects. This gives them physical and chemical properties which are absent in other materials. Nanosilver particle occupy an important position in surface-enhanced Raman and resonance scattering spectroscopy as well as molecular biological systems and supramolecular structures. They are also essential for theoretical research.
Nanosilver powder is widely used as a catalyst and diluent for ultra-low temperature 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 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 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, liquid phases and reliable phases. The gas phase process is expensive, has high energy consumption, and produces a low yield. The ultrafine silver prepared by reliable phase method has large particles and a wide distribution of particle sizes.
The liquid phase chemical reduction is a method that uses a reducing compound to deposit ultrafine silver from its complex solution, aqueous system or organic form. Formaldehyde is a common reducing agent. Other reducing agents are ascorbic, glycerin and organic amines. 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 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 vary between one and two. 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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