Article 7114

Title of the article

INVESTIGATION OF THINNING OF EMULSION FILMS STABILIZED
BY SOLID PARTICLES VIA PRESSURE DROP TECHNIQUE

Authors

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

Index UDK

 544.77.051.12

Abstract

Background. The article describes the results of investigation of the water-in-oil films by the pressure drop technique (PDT). The method allows to overcome the capillary pressure arising in a solid-stabilized-film and to obtain a thin film.
Materials and methods. The solid particles of aluminum hydroxide, modified with stearic acid, were used as a solid emulsifier. An applied pressure drop ΔР was measured using a U-shaped water manometer. The film thickness was determined by the conductometric method.
Results. In the first series of experiments the film was thinning during a gradual increase in pressure ΔР from 0 up to 5 kPa in steps of 1 kPa for 5 minutes. Film thins to a quasi-equilibrium thickness he = 24,2–298 µm (at ΔР = 1–4 kPa). Without additional pressure the equilibrium film thickness was equal to 32 µm. In the second series of experiments at a sharp increase in pressure ΔР the film was thinning to a rupture thickness hr = 27,5–31,5 (at ΔР = 1–4 kPa).
Conclusions. With a gradual increase of the pressure the author reached a quasi-equilibrium film thickness that was less than the thickness of the broken films obtained with a sharp increase in the pressure. Non-equilibrium films were ruptured with thicknesses corresponding to the region of restructuring of the solid particles package inside the film.

Key words

solid emulsifier, emulsion, films, pressure.

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Дата обновления: 09.07.2014 11:53