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DLVO surface forces in liquid films and statistical mechanics of colloidal oscillatory structural forces in dispersion stability by Alex Nikolov; Jongju Lee; Darsh Wasan is a Materials Science article available to read on EtoBox.

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This paper focuses on the theory of the dispersion stability considering two models. In the classical DLVO model of surface forces, the interactions between two particles consist of two terms: the London-van der Waals attractive interaction and the electrostatic repulsive interaction in the frame of the Debye-Hückel theory. The solvent, the aqueous solution of the electrolyte, was considered the continuous phase. The film stability criteria are P γ > Π and dP γ /dh > 0. Henderson and Lozada-Cassou (HC) applied the statistical mechanics approach to calculate the film free energy to predict the dispersion stability by considering two large hard spheres as colloidal particles immersed in a fluid of dispersed small particles (the solvent). HC applied the radial distribution function g(r) to calculate the free oscillatory structural energy using W(r) = − kT ln g(r). HC's theoretical approach was also applied to the particle collective interactions in the film and explains the stability of film formed from complex fluids (e.g., micellar and colloidal dispersions). The differences between the solvation oscillatory layering forces and colloidal oscillatory structural forces are discussed.

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Author

Alex Nikolov; Jongju Lee; Darsh Wasan

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Materials Science (Physical Sciences)