FOAMS AND EMULSIONS STABILIZED BY SOLID PARTICLES: MECHANISMS OF STABILITY 

Nushtaeva Alla Vladimirovna, Candidate of chemical sciences, associate professor, sub-department of physics and chemistry, Penza State University of Architecture and Construction (28 G. Titova street, Penza, Russia), nushtaeva.alla@yandex.ru
Vilkova Natal'ya Georgievna, Doctor of chemical sciences, professor, sub-department of physics and chemistry, Penza State University of Architecture and Construction (28 G. Titova street, Penza, Russia), ngvilkova@mail.ru

544.77

10.21685/2307-9150-2017-4-6

Background. The article presents a review and an analysis of the main factors that determine the stability of foams and emulsions stabilized by solid particles (Pickering emulsion).
Results. The high energy of particle attachment at the interphase leads to formation of a dense interfacial layer of particles on the surface of bubbles (or droplets) and to reduction of interfacial tension. Capillary pressure (a specific factor of stabilization by solid stabilizers; an analog of disjoining pressure) arises in a tinning emulsion film with solid particles. Steric disjoining pressure arises in an emulsion film when layers of interfacial particles contact and deform. In the case of structuring in the continuous phase containing colloids the foam (or emulsion) stability depends on elastic-mechanical properties of the net-structure that consists of the interfacial layers. The structuring is one more solid-stabilization specific factor.
Conclusions. A complex of these factors provides extremely high stability of Pickering emulsions and solid-stabilized-foams in comparison with systems stabilized with surfactants. The solid-stabilized-systems are capable to hold the structure even when dried.

foams, Pickering emulsions, solid particles, stabilization

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