Highly concentrated oil-in-water (O/W) emulsions stabilized by catanionic surfactants

被引:11
|
作者
Zhang, Na [1 ,2 ,5 ]
Fu, Yanxu [1 ,2 ]
Chen, Guojun [1 ,2 ]
Liang, Dong [1 ,2 ]
Abdunaibe, Aibu [1 ,2 ]
Li, Hongguang [3 ,4 ]
Hao, Jingcheng [1 ,2 ]
机构
[1] Shandong Univ, Minist Educ, Key Lab Colloid & Interface Chem, Jinan 250100, Shandong, Peoples R China
[2] Shandong Univ, Minist Educ, Key Lab Special Aggregated Mat, Jinan 250100, Shandong, Peoples R China
[3] Chinese Acad Sci, Lanzhou Inst Chem Phys, State Key Lab Solid Lubricat, Lanzhou 730000, Gansu, Peoples R China
[4] Chinese Acad Sci, Lanzhou Inst Chem Phys, Lab Clean Energy Chem & Mat, Lanzhou 730000, Gansu, Peoples R China
[5] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
基金
中国国家自然科学基金;
关键词
Viscoelastic; Oil-in-water; Emulsion; Catanionic surfactant; Paraffin oil; PHASE-BEHAVIOR; CHAIN-LENGTH; MICELLE TRANSITION; INVERSION; VESICLES; SYSTEMS; ACID;
D O I
10.1016/j.colsurfa.2016.02.009
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The abilities of a series of catanionic surfactants (catanionics) to emulsify paraffin oil/water (PO/H2O) mixtures have been investigated. It was found that catanionics with head-to-tail structures are efficient emulsifiers, including tetradecyltrimethylammonium laurate (TTAL), decyltrimethylammonium laurate (D(10)TAL) and 1-methyl-3-decyl-immidazolium laurate (1-M-3-D-10-ImL). Stable oil-in-water (O/W) emulsions were obtained by simple hand-shaking at low water content (down to 6% by volume), as confirmed by visual inspection, optical microscopy observations, conductivity measurements and confocal fluorescence microscopy observations. The emulsion droplets are closely-packed, imparting the samples viscoelastic properties as proved by rheological measurements. The emulsions could not be destroyed at elevated temperatures and interestingly, a slight increase of viscoelasticity was observed. Specifically for TTAL which was prepared by acid-base neutralization between tetradecyltrimethylammonium hydroxide (TTAOH) and lauric acid (LA), the influence of the composition of the ion-pair was also investigated. While the properties of the emulsions can be only slightly influenced at LA-rich side, significant influence was noted at TTAOH-rich side. We have also checked the emulsifying ability of a pseudogemini catanionic surfactant, bis(tetradecyltrimethylammonium) adipate ((TTA)(2)A), and found it could not emulsify PO/H2O mixtures under the same experimental conditions, indicating that the architecture of the catanionics also has a profound influence. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码:159 / 168
页数:10
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