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The Mechanism of Stabilization of Hydrophobic Sols by Non-ionic Surface Active Agents

Yu. Glazman ; Tufts and Northeastern Universities in Boston, USA

Puni tekst: engleski pdf 5.613 Kb

str. 115-123

preuzimanja: 712



Stabilization of hydrophobic sols by nonionic surface-active
agents (NSAA) is of great theoretical and practical significance. The
effect of NSAA on the stability of hydrophobic sols is discussed not
as an isolated problem but it is considered as a constituent of the
whole problem of the disperse systems stability. Particular attention
is paid to the lyophilic colloidal dispersions. The stability of lyophilic
sols is interpreted basing on the idea of the disjoining pressure
of thin liquid layers and especially on its structural component. The
analysis of the experimental data obtained shows that hydrophilization
of the dispersed phase surface occurs as a result of
oriented adsorption of the NSAA molecules by colloidal particles,
and that lyophilic colloidal dispersions are formed. Another alternative
interpretation of the same experimental data, based on the idea
of steric stabilization mechanism, is also discussed. A certain contribution
of the steric factor to the total effect of stabilization by
NSAA is not excluded in some cases.

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