|
S. S. Berdonosov
The Aggregation of Primary Nano and Microparticles
Resulting in Formation of Hollow Structures
Abstract
It
was demonstrated that the formation of hollow structures with the size from few
micron to several tens of millimeters from oversaturated vapor or solution
could be caused by the following reasons: a) fast solvent evaporation from
micro-drops of solution and crystallization of the dissolved substances in the
surface layer of the drop; b) chemical reaction between substances from the
drop and substances from outside the drop; c) aggregation of primary
nanoparticles in the agitated liquid; d) aggregation of the particles that
arise upon the thermohydrolysis of the initial solid compound. The examples of
preparations from hollow particles using the above mentioned routes are given
and the peculiarities of their formation are discussed.
Copyright (C) Chemistry Dept., Moscow State University, 2002
|
|
