title: Molecular interaction in binary surfactant mixtures containing alkyl polyglycoside.
abstract: Surface tensions were measured for several binary mixtures of a multidegree polymerized alkyl polyglycoside, C12G1.46' with different types of surfactants in 0.1 M NaCl at 25 degrees C. Based on regular solution theory, using a dimensional crystal model and a phase separation model, the molecule exchange energy in mixed monolayer formation (epsilon) and mixed micellization (epsilon(m)) were determined. Surfactants used in the mixtures with C12G1.46 in this study are C12E3S (trioxyethylenated dodecyl sulfonate), C12TAC (dodecyl trimethylammonium chloride), BE-6 (hexaoxyethylenated trisiloxane surfactant), and TMN-6 (hexaoxyethylenated-2,6,8-trimethylnonanol). The mixtures show exchange energy in mixed monolayer formation (epsilon) and mixed micellization (epsilon(m)) ranging from -660 to -1410 J/mol, indicating a decrease in surface energy upon mixing. The decreases in surface energy are in the order C12G1.46/C12E3S > C12G1.46/C12TAC, C12G1.46/C12TAC > C12G2/C12TAC and C12G1.46/BE-6 > C12G1.46/TMN-6. The ability of the mixed monolayer formation relative to the mixed micelle formation of the same binary mixture, measured by the (epsilon-epsilon(m)) values, is in the order C12G1.46/BE-6 > C12G1.46/TMN-6 > C12G1.46/C12E3S-->0 > C12G1.46/C12TAC.
authors.affiliation: Key Laboratory of Colloid and Interface Chemistry (Shandong University), Ministry of Education, Jinan 250100, China. zhongniw@hotmail.com
authors.forename: Zhong-Ni
authors.initials: ZN
authors.lastname: Wang
authors.forename: Gan-Zuo
authors.initials: GZ
authors.lastname: Li
authors.forename: Gao-Yong
authors.initials: GY
authors.lastname: Zhang
authors.forename: Zhao-Yu
authors.initials: ZY
authors.lastname: Diao
authors.forename: Lu-Sheng
authors.initials: LS
authors.lastname: Chen
authors.forename: Zheng-Wu
authors.initials: ZW
authors.lastname: Wang
mesh_terms: D005026:Ethylene Glycols / Q000737:chemistry*; D006027:Glycosides / Q000737:chemistry*; D008823:Micelles; D015394:Molecular Structure; D010316:Particle Size; D011092:Polyethylene Glycols / Q000737:chemistry*; D000644:Quaternary Ammonium Compounds / Q000737:chemistry*; D012833:Siloxanes / Q000737:chemistry*; D013451:Sulfonic Acids / Q000737:chemistry*; D013500:Surface Tension; D013501:Surface-Active Agents / Q000737:chemistry*
chemical_list: D005026:Ethylene Glycols; D006027:Glycosides; D008823:Micelles; D000644:Quaternary Ammonium Compounds; D012833:Siloxanes; D013451:Sulfonic Acids; D013501:Surface-Active Agents; C514689:hexaoxyethylenated trisiloxane; C514688:hexaoxyethylenated-2,6,8-trimethylnonanol; C514687:trioxyethylenated dodecyl sulfonate; D011092:Polyethylene Glycols; C022806:dodecyltrimethylammonium