Stabilisation of cosmetic compositions using combined emulsifiers
https://doi.org/10.32362/2410-6593-2021-16-3-241-251
Abstract
Objectives. This study investigated the surface properties and micelle formation of combined stabilizers, which are a mixture of ionic and nonionic surfactants or different nonionic surfactants, to establish a correlation between the composition of stabilizers and the colloidal–chemical properties of direct emulsions obtained in their presence.
Methods. The surface tension at the interface between the aqueous solutions of the combined stabilizers with air and toluene was measured using a digital tensiometer. The sedimentation stability of the emulsions was assessed by the volume of the exfoliated water and oil phases for seven days. The particle sizes of the dispersed phase were determined using an Olympus CX3 bright field microscope equipped with a universal serial bus video camera connection. The rheological properties of the emulsions were evaluated using a rotary viscometer.
Results. According to the isotherms of the surface tension of aqueous surfactant solutions at the interface with air and toluene at emulsion preparation temperatures of 50 °C and 65 °C, a mixture of nonionic surfactants exhibited a higher surface activity and lower critical micelle concentration at the interface with toluene. The optimal amount of stabilizers providing stability to the compositions for one month was 4 mass % for a mixture of anionic surfactants and nonionic surfactants and 7 mass % for mixtures of different nonionic surfactants. Emulsions obtained in the presence of a mixture of anionic and nonionic surfactants exhibited higher kinetic sedimentation stability values due to the formation of electrostatic and steric stabilization factors in the system. The developed compositions were microheterogeneous systems, the average droplet diameter of which varied within the range of 1.0–5.7 µm. In terms of rheological properties, emulsions were classified as liquid-like structured systems with coagulation structures; the strength of single contacts between particles of the dispersed phase was (1.6–27.0) × 10-10 N.
Conclusions. A comparison of the physicochemical characteristics of the compositions obtained in the presence of organic emulsifiers showed that emulsions stabilized using a mixture of ionic and nonionic surfactants, which form mixed adsorption layers, exhibited the best set of properties.
About the Authors
V. V. KorypaevaRussian Federation
Valentina V. Korypaeva, Postgraduate Student, Department of General Chemical Technology
86, Vernadskogo pr., Moscow, 119571
E. F. Bukanova
Russian Federation
Evgeniya F. Bukanova, Cand. Sci. (Chem.), Associate Professor, Department of Colloidal Chemistry
86, Vernadskogo pr., Moscow, 119571
E. V. Eskova
Russian Federation
Evgeniya V. Eskova, Senior Lecturer, Department of Colloidal Chemistry
86, Vernadskogo pr., Moscow, 119571
V. A. Sokhraneva
Russian Federation
Vera A. Sokhraneva,Student
86, Vernadskogo pr., Moscow, 119571
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Supplementary files
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1. Drop-size distribution of emulsions stabilized with various amounts of a mixture of nonionic surfactants (2–7 g per 100 mL of the composition). | |
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- The surface properties and micelle formation of combined stabilizers, which were a mixture of ionic and nonionic surfactants or a mixture of different nonionic surfactants, were studied.
- A correlation was established between the composition of stabilizers and the colloidal–chemical properties of direct emulsions obtained in their presence.
- Optimal emulsifier content was defined as 4% for mixtures of ionic and nonionic surfactants and 7% for mixtures of different nonionic surfactants. In the presence of stabilizers, the values of kinetic sedimentation stability increased by 1000 times.
- An emulsion in the form of a stabilized mixture of ionic and nonionic surfactants exhibited the best set of properties and ensured the stability of the composition because of electrostatic and steric sustainability factors.
Review
For citations:
Korypaeva V.V., Bukanova E.F., Eskova E.V., Sokhraneva V.A. Stabilisation of cosmetic compositions using combined emulsifiers. Fine Chemical Technologies. 2021;16(3):241-251. https://doi.org/10.32362/2410-6593-2021-16-3-241-251