Solubility of ionic surfactants below their Krafft point in mixed micellar solutions: Phase diagrams for methyl ester sulfonates and nonionic cosurfactants
| Autor: | Peter A. Kralchevsky, Emily H. P. Tan, Rumyana D. Stanimirova, Yee Wei Ung, Veronika I. Yavrukova, Jordan T. Petkov, Hui Xu, Tatiana G. Slavova, Krassimir D. Danov |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
FOS: Physical sciences 02 engineering and technology Condensed Matter - Soft Condensed Matter 010402 general chemistry 01 natural sciences Krafft temperature Micelle Biomaterials Surface-Active Agents Colloid and Surface Chemistry Pulmonary surfactant Physics - Chemical Physics Phase (matter) Solubility Micelles Alkyl Ions Chemical Physics (physics.chem-ph) chemistry.chemical_classification Aqueous solution Esters 021001 nanoscience & nanotechnology 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry Chemical engineering Micellar solutions Soft Condensed Matter (cond-mat.soft) 0210 nano-technology |
| Zdroj: | Journal of Colloid and Interface Science. 601:474-485 |
| ISSN: | 0021-9797 |
| DOI: | 10.1016/j.jcis.2021.05.147 |
| Popis: | Hypothesis Many ionic surfactants with wide applications in personal-care and house-hold detergency show limited water solubility at lower temperatures (Krafft point). This drawback can be overcome by using mixed solutions, where the ionic surfactant is incorporated in mixed micelles with another surfactant, which is soluble at lower temperatures. Experiments The solubility and electrolytic conductivity for a binary surfactant mixture of anionic methyl ester sulfonates (MES) with nonionic alkyl polyglucoside and alkyl polyoxyethylene ether at 5 °C during long-term storage were measured. Phase diagrams were established; a general theoretical model for their explanation was developed and checked experimentally. Findings The binary and ternary phase diagrams for studied surfactant mixtures include phase domains: mixed micelles; micelles + crystallites; crystallites, and molecular solution. The proposed general methodology, which utilizes the equations of molecular thermodynamics at minimum number of experimental measurements, is convenient for construction of such phase diagrams. The results could increase the range of applicability of MES–surfactants with relatively high Krafft temperature, but with various useful properties such as excellent biodegradability and skin compatibility; stability in hard water; good wetting and cleaning performance. |
| Databáze: | OpenAIRE |
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