Solubility of ionic surfactants below their Krafft point in mixed micellar solutions: Phase diagrams for methyl ester sulfonates and nonionic cosurfactants

JOURNAL OF COLLOID AND INTERFACE SCIENCE

卷:601

Article

Danov, Krassimir D.¹  Stanimirova, Rumyana D.¹  Kralchevsky, Peter A.¹  Slavova, Tatiana G.¹  Yavrukova, Veronika I.¹  Ung, Yee Wei²  Tan, Emily²  Xu, Hui²  Petkov, Jordan T.^1,3 

[1] Sofia Univ, Fac Chem & Pharm, Dept Chem & Pharmaceut Engn, Sofia 1164, Bulgaria

[2] KLK OLEO, KL Kepong Oleomas Sdn Bhd, Menara KLK, Jalan PJU 7-6, Petaling Jaya 47810, Selangor Dalur, Malaysia

[3] Univ Manchester, Sch Phys & Astron, Biol Phys, Schuster Bldg,Oxford Rd, Manchester M13 9PL, Lancs, England

关键词: Methyl esters sulfonates;    Alkyl polyglucoside;    Alkyl polyoxyethylene ether;    Surfactant mixtures;    phase diagrams;    Lowering of the Krafft point;    Micelle-crystallite coexistence;   

DOI  :  10.1016/j.jcis.2021.05.147

来源: Elsevier

【 摘 要 】

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 degrees 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. (c) 2021 Elsevier Inc. All rights reserved.

【 授权许可】

Free