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Peptization of Colloidal Sols

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Introduction to Sol-Gel Processing

Abstract

This chapter is devoted to the physical chemistry involved in the phenomenon of peptization of a sol, which can be defined as a sable dispersion of colloidal particles in a liquid medium. Two main theories are summarized, the classical electrostatic or so-called DLVO theory, from the initials of its main inventors, and the steric stabilization theory. They describe the conditions when destabilization of a sol occurs, which induces an aggregation of colloidal particles known as coagulation or flocculation, followed by precipitation of these aggregates when their mass becomes sufficient. More recent advances regarding the hydrophobic and hydrophilic interaction, as well as the main results of statistical thermodynamic computations, are summarized. Other phenomena occurring in sols, such as their ordering while still dispersed in liquid medium, are also very briefly addressed.

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Pierre, A.C. (2020). Peptization of Colloidal Sols. In: Introduction to Sol-Gel Processing. Springer, Cham. https://doi.org/10.1007/978-3-030-38144-8_6

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