Abstract

A phenomenon of giant (up to 10¹⁰ times) enhancement in rate of aggregation of fractal nanostructures, caused by light in silver hydrosoles of and spectral features of its photoemission nature were discovered [1]. That means that rate of photo-stimulated aggregations must be determined by the value of photo-emission current from the particles. Similar conclusion was made in experiments, where increase of photo-coagulation rate of Ag nano-particles in aerosols was found to be accompanied by the increase of photoelectron emission [2]. We have shown that photo-stimulated aggregation of nano-particles into fractal structures in colloids is stipulated not only by one-photon, but by two-photon photo-effect too, even at intensities of illuminating light on the order of solar.

© 1998 IEEE