Ultrafine particles of silver star-shaped.
Ultrafine particles of silver star-shaped properties of the non-wetting and superhydrophobicity in relation to any liquid, including chemically aggressive. This will allow you to use these particles in films and polymers for all surfaces, increasing their resistance to corrosion, increasing their service life.
Traditionally, the silver particles have a spherical shape. Recently by hydrochemical sedimentation method obtained modified ultrafine silver particles of other shapes – star, multi-beam, resembling star-shaped polyhedra. They have from 32 to 56 of the pyramidal and wedge-shaped beams with a length of 40-50 microns with an average core size of 5-6 microns. The density of the powder of such particles is equal to 0.4-0.8 g/cm3, which is less than the density of water. The specific surface area of particles of silver star-shaped ranges from 0.3 m2/g or more.
A method of producing ultrafine silver powder comprises treating an aqueous solution of nitrate of silver by the reducing agent. As the reducing agent is an aqueous solution of diamide Topolino acid (thiourea) and ammonium hydroxide. Thus, the obtaining of ultrafine silver powder is fairly simple.
Modified ultrafine silver particles have a wetting angle of up to 150-180°. Cavity surface textures of the particles is filled with gas, and then nesmeshivaemost any fluids and properties of superhydrophobicity.
The main peculiarity of such particles is their nesmeshivaemost, superhydrophobicity in relation to any liquid, including chemically aggressive, and the possibility of applying for protection of surfaces from chemically aggressive liquids, oil and products of its processing, etc., of liquids. This will allow you to use these particles in films and polymers to protect any surfaces, increasing their resistance to corrosion, increasing their service life.
The actual value of these properties are star-shaped ultrafine particles of silver in the composition of the polymers and films are for the protection of pipelines, e.g. in the chemical, fuel, oil, fuel and chemical industries, which increases the time of trouble-free service piping, greatly enhance the environmental safety of the pipeline system operation, reduce maintenance costs and replacement of pipelines.
In addition to the above properties of ultrafine silver particles have a star-shaped traditional silver particles properties: bactericidal action, catalytic properties in chemical processes, etc.
– particle density less than the density of water,
– simple, versatile and environmentally friendly method for the preparation of ultrafine particles of silver star-shaped,
nesmeshivaemost and superhydrophobicity star-shaped forms ultrafine particles of silver in relation to any liquid, including chemically aggressive.