The phase transition from L-3 phase to vesicles and rheological properties of a nonionic surfactant mixture system
文献类型： 外文期刊
作者： Shen, Yuwen 2 ; Hoffmann, Heinz 4 ; Lin, Haitao 1 ; Liu, Zhaohui 1 ; Hao, Jingcheng 5 ;
作者机构： 1.Shandong Acad Agr Sci, Inst Agr Resources & Environm, Jinan 250100, Shandong, Peoples R China
2.Minist Agr, Key Lab Wastes Matrix Utilizat, Jinan, Shandong, Peoples R China
3.Shandong Prov Key Lab Plant Nutr & Fertilizer, Jinan, Shandong, Peoples R China
4.Univ Bayreuth, Bayreuther Zentrum Kolloide & Grenzflachen, Bayreuth, Germany
5.Shandong Univ, Key Lab Colloid & Interface Chem, Minist Educ, Jinan 250100, Shandong, Peoples R China
关键词： Phase transition;Sponge phase;Vesicle phase;Surfactants;H-2 NMR
期刊名称：COLLOID AND POLYMER SCIENCE （ 影响因子：1.931； 五年影响因子：1.87 ）
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收录情况： SCI
摘要： A sponge phase (L-3 phase) was observed in aqueous solution of a nonionic surfactant polyethylene glycol ether of tridecyl alcohol with the average 3 of ethylene oxide (CH3(CH2)(12)(OCH2CH2)(3)OH, abbreviated as Trideceth-3) with tetradecyldimethylamino oxide (, abbreviated as C(14)DMAO). The L-3 phase can be transferred to planar lamellar phase after the bilayer was protonated by the formic acid formed through the hydrolysis of methylformate. The addition of surface charge into the nonionic L-3 phase through electrostatic repulsion on the ionic head groups will suppress the Helfrich undulation and induce the transition to planar lamellar phase. The planar lamellar phase can be transformed into multilamellar vesicles under shear. Rheological properties show that both of the storage modulus and the loss modulus of the lamellar phase were increased with the increment of surface charge density. The phase transition from L-3 phase to vesicles was characterized by rheological measurements, H-2 NMR spectra, and transmission electron microscope (TEM) observations. To our best knowledge, this is the first example of a controlled phase transition in nonionic surfactant mixtures through protonation and shear forces. The procedure provides a direction on how to achieve phase transition in surfactant solution by changing the conditions and an application of phase transition of controlled materials.
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