2021/05/25 by Krassimir D. Danov, Danov, Krassimir D., Rumyana D. Stanimirova +16
Chemical Engineering · Chemistry · Environmental Science · Materials Science · #Chemical Physics (physics.chem-ph) #Environmental Chemistry and Analysis #FOS: Physical sciences #Ionic liquids properties and applications #Soft Condensed Matter (cond-mat.soft) #Surfactants and Colloidal Systems #Synthesis and properties of polymers
paper · pdf · doi:10.48550/arxiv.2105.11824
openalex publication_date 2021/05/25 · openalex created_date 2022/07/25 · openalex updated_date 2026/07/28
Many ionic surfactants with wide applications in personal-care and house-hold\ndetergency show limited water solubility at lower temperatures (Krafft point).\nThis drawback can be overcome by using mixed solutions, where the ionic\nsurfactant is incorporated in mixed micelles with another surfactant, which is\nsoluble at lower temperatures. The solubility and electrolytic conductivity for\na binary surfactant mixture of anionic methyl ester sulfonates (MES) with\nnonionic alkyl polyglucoside and alkyl polyoxyethylene ether at 5 deg C during\nlong-term storage were measured. Phase diagrams were established; a general\ntheoretical model for their explanation was developed and checked\nexperimentally. The binary and ternary phase diagrams for studied surfactant\nmixtures include phase domains: mixed micelles; micelles and crystallites;\ncrystallites, and molecular solution. The proposed general methodology, which\nutilizes the equations of molecular thermodynamics at minimum number of\nexperimental measurements, is convenient for construction of such phase\ndiagrams. The results could increase the range of applicability of\nMES-surfactants with relatively high Krafft temperature, but with various\nuseful properties such as excellent biodegradability and skin compatibility;\nstability in hard water; good wetting and cleaning performance.\n