Article 5115

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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. In order to estimate the role of hexylamine to stabilize emulsions and foams, it is necessary to know in what state – dissolved or dispersed – it remains in the aqueous phase. Photometric analysis of hexylamine – water system was carried out.
Materials and methods. The author researched the binary system of hexylamine – water, obtained by shaking the components. The molar concentration of hexylamine in the mixture varied from 0,003 to 0,151 mol/L. Hexylamine droplet size was calculated from the characteristic turbidity determined by the turbidimetric method of analysis.
Results. The increase in turbidity as the concentration of the system was associated only with a number of drops per volume unit, and the radius of the droplet regardless of the concentration remained constant. The average value of the droplet radius was equal to R = 45 nm. At upholding the turbidity decreased due to the gradual release of hexylamine in a separate bulk phase. The role of hexylamine in the emulsifying complex consisted, apparently, not only in hydrophobization of the silica surface. Since the radius of the aggregates of solid particles of silica was equal to 38 nm (Aerosil) and 22 nm (Ludox), it is assumed that at high concentration of hexylamine the drops and silica particles formed hybrid aggregates, stabilizing emulsions of reverse type.
Conclusions. The turbidimetric analysis showed that the binary system obtained by mixing of water with hexylamine, appears to be a thermodynamically unstable nanoemulsion, the droplet size of which is independent of the concentration of hexylamine.

Key words

hexylamine, nanoemulsion, turbidimetric analysis.

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