Phase behavior and viscous properties of cetyltrimethylammonium bromide and sodium dodecyl sulfonate aqueous mixtures
Phase behavior and viscous properties of cetyltrimethylammonium bromide and sodium dodecyl sulfonate aqueous mixtures
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十六烷基三甲基溴化铵和十二烷基磺酸钠水混合物的相行为和粘性
DOI：
10.1016/j.colsurfa.2008.11.001
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发表时间：
2009-03
期刊：
影响因子：
--
通讯作者：
Yi-Lan You
中科院分区：
文献类型：
--
作者：
Yan-Qing Nan;Li-Sheng Hao;Yi-Lan You
研究了十六烷基三甲基溴化铵（CTAB）/十二烷基磺酸钠（AS）/水体系在318.15K下的相行为，表面活性剂总摩尔分数xT≤0.020。除了低浓度范围内的7个相区外，在高浓度范围内得到了两个新的相区，即六方相液晶相区和与之相邻的双水相区。测量了一些各向同性单相体系、含水两相体系和层状液晶体系的剪切粘度。实验结果表明，在任一各向同性单相区，在一定的xT下，存在一个剪切粘度最大峰。随着xT的增大，剪切粘度最大峰向远离CTAB与AS等摩尔比的位置移动，同时剪切粘度最大峰的值增大。在每个xT下，AS过量的各向同性单相区的剪切粘度峰值小于CTAB过量的各向同性单相区的剪切粘度峰值。各向同性单相体系在剪切粘度峰附近的流变行为和层状液晶体系的流变行为是复杂的。这些体系均表现出触变性、反触变性和复合触变性。实验结果表明，位于两相体系边界附近的各向同性单相体系和层状液晶体系以及两相体系中的共存相都不是很粘。当xT≤0.005时，它们的剪切粘度通常为几至几十mPas。为了了解混合体系的流变行为，研究了一些各向同性单相体系和双水相体系的TEM显微照片。
Phase behavior of cetyltrimethylammonium bromide (CTAB)/sodium dodecyl sulfonate (AS)/water systems at 318.15K with the total surfactant mole fraction xT≤0.020 was investigated. In addition to the seven phase regions in the lower concentration range, two new phase regions, i.e. the hexagonal liquid crystalline phase region and its adjacent aqueous two-phase region were obtained in the higher concentration range. Shear viscosities of some isotropic single-phase systems, aqueous two-phase systems and lamellar liquid crystalline systems were measured. The experimental results indicate that at either isotropic single-phase region, under certain xT, there exists one shear viscosity maximum peak. As xTincreases, the shear viscosity maximum peak shifts to the position far from the equimolar ratio of CTAB and AS, and meanwhile the value of the shear viscosity maximum peak increases. At each xT, the value of shear viscosity peak at the isotropic single-phase region with excess AS is less than that at the isotropic single-phase region with excess CTAB. The rheological behavior of the isotropic single-phase systems around the shear viscosity peak and that of lamellar liquid crystalline systems are complicated. Thixotropic, antithixotropic and complex thixotropic behaviors were all observed for these systems. Experimental results illustrate that both the isotropic single-phase systems and lamellar liquid crystalline systems located at position very close to the boundaries of the aqueous two-phase systems, as well as the coexisted phases in aqueous two-phase systems are not very viscous. When xT≤0.005, their shear viscosities are usually several to dozens mPas. In order to understand the rheological behaviors of the mixed systems, TEM micrographs of some isotropic single-phase systems and aqueous two-phase systems were investigated.
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DOI：
10.1021/je00035a016
发表时间：
1984-01-01
期刊：
JOURNAL OF CHEMICAL AND ENGINEERING DATA
影响因子：
--
作者：
ISONO, T
通讯作者：
ISONO, T
DOI：
10.1016/0927-7757(93)80086-t
发表时间：
1993-09
期刊：
Colloids and Surfaces A: Physicochemical and Engineering Aspects
影响因子：
--
作者：
Gan‐zuo Li;Fang Li;Lichun Zheng;Hong-li Wang
通讯作者：
Gan‐zuo Li;Fang Li;Lichun Zheng;Hong-li Wang
DOI：
10.1016/b978-0-12-391927-4.10024-6
发表时间：
1985
期刊：
The European Physical Journal C
影响因子：
--
作者：
J. Israelachvili
通讯作者：
J. Israelachvili
影响因子：
2.2
作者：
G. Hertel;H. Hoffmann
通讯作者：
G. Hertel;H. Hoffmann
影响因子：
3.9
作者：
J. Franco;J. Muñoz;C. Gallegos
通讯作者：
J. Franco;J. Muñoz;C. Gallegos