Izlaganje sa skupa

75 Years of Study in the Precipitation, Crystallization, Coagulation, and Flocculation in Ionic Solution - A Partisan Review

Božo Težak ; University of Zagreb, and Institute »Rudjer Boskovic«, Zagreb, Croatia, Yugoslavia

Sažetak

Assuming that the precipitation of slightly soluble substances
from aqueous solution represents the possibility to establish the
general and special characteristics of precipitation, crystallization,
coagulation, and flocculation processes, the rresearches of G. A.
Hulett, P. P . von Weimarn, S. Oden, A. Smekal, V. Kohlschiltter,
Wo. Ostwald, V. K. LaMer and others are •reviewed by 'Pointing
to the accord and differences in the experimental results and their
interpretations.
Essentially the same mechanism of the stability/tlrutability
states , is applied for all component subsystems (embryonation,
nucleation, coagulation or flocculation of primary .particles) of
precipitation processes.
Special attention was paid to the role of concentrational and
spatial-temporal factors i!n the appearence of intermediates a:nd
various entities controlling the formation of the usually non-
equilibrated structures. The findimgs are examined from a more
unified point of view by taking into account the short-orange and
long-ra:nge forces in discontinuities of spatial-temporal functions.
An attempt was made to use kinetic and thermodynamic data
to give a statistical picture of the systems in which the mechanism
of ·interactions representing molecular and ionic forces in the bulk
solution and in the methorical layer of the solid is expressed.
In trying to fliind a rational basis for the interpretation of a
large spectrum of critical interactions involved in the transition
from homogeneous to heterogeneous systems, the so-called ».precipitationbodies«, PB, and their relationships to other diagrammaticalpresentations of di:stl'tbution functions are presented.

Ključne riječi

Hrčak ID:

196434

URI

https://hrcak.srce.hr/196434

Datum izdavanja:

22.12.1976.

Posjeta: 673 *