Nanotechnology Research and Practice

140-150

Authors: Ignat Ignatov, Oleg Mosin

In this review article are studied the methods for preparation of micro dispersed colloid silver nanoparticles and the electron microscopy, as well as the scopes of their practical application in nano-industry, bionanotechnology and water processing and water purification techniques. The mechanisms of bactericidal action of colloid silver on a microbial cell are discussed from the point of view of absorptive, electrostatic, enzyme and mutagen theories. Silver exerts both bactericidal and bacteriostatic effect against more than 500 species of microorganisms. The bactericidal effect of silver is 1.500 times more than the same concentration of phenol and 3.5 times more than the action of mercuric chloride. It is shown that the effects of colloid silver are defined by the concentration, the sizes of micro dispersed nanoparticles and their stability in water solutions. The micro dispersed silver nanoparticles may be prepared by using various physical-chemical, biochemical and biotechnological methods.