Basic Principles of Dispersions by Tadros Tharwat F

Author:Tadros, Tharwat F. [Неизв.]
Language: eng
Format: epub
Publisher: De Gruyter
Published: 2018-06-30T21:00:00+00:00

where P(h) is the pressure of a film with thickness b and P0 is the pressure of a sufficiently thick film such that the net interaction free energy is zero.

π(h) may be equated to the net force (or energy) per unit area acting across the film,

where GT is the total interaction energy in the film.

π(h) is made up of three contributions due to electrostatic repulsion (πE), steric repulsion (πs) and van der Waals attraction (πA),

To produce a stable film πE + πs > πA and this is the driving force for prevention of coalescence which can be achieved by two mechanisms and their combination:

(i)increased repulsion, both electrostatic and steric;

(ii)dampening the fluctuation by enhancing the Gibbs elasticity.

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