Giant micellar worms under shear: A rheological study using SANS

被引:101
作者
Croce, V
Cosgrove, T
Dreiss, CA
King, S
Maitland, G
Hughes, T
机构
[1] Univ Bristol, Sch Chem, Bristol BS8 1TS, Avon, England
[2] Rutherford Appleton Lab, ISIS Facil, Didcot OX11 0QX, Oxon, England
[3] Schlumberger Cambridge Res Ltd, Cambridge CB3 0EL, England
关键词
D O I
10.1021/la0479410
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Flow-SANS experiments were performed on viscoelastic aqueous solutions of erucyl bis(hydroxyethyl) methylammonium chloride in the presence of potassium chloride. This cationic surfactant has the ability to form very long and flexible wormlike micelles upon addition of salt. The effects of the key-parametersshear rate, temperature, surfactant and salt concentration-on the ability of the micelles to align in the flow-field were investigated. The scattering data were analyzed in terms of an anisotropy factor (A(f)). It was found that the wormlike micelles aligned in the direction of the applied shear rate and that the anisotropy factor increased with shear rate. In addition, an increase in temperature caused a decrease of the anisotropy factor (A(f)) due to the formation of shorter worms. Furthermore, the branching of the micelles at high ionic strength caused the anisotropy factor to decrease in comparison with the values obtained from linear wormlike micelles, hence revealing that the formation of 3-way junctions restricts the alignment of the micelles in the shear-flow. Furthermore, the total surfactant concentration was found to affect the shear-induced patterns significantly, and different behaviors were observed depending on the ionic strength.
引用
收藏
页码:6762 / 6768
页数:7
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