Article 7114

Title of the article



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),

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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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