This paper investigated the rheological properties of novel viscoelastic thickening micelle system formed by surfactin and cetyl trimethyl ammonium bromide (CTAB). The total concentration of surfactin and CTAB was maintained at 12 wt%. The rheological behavior of the surfactin/CTAB synergistic micelles with different mass ratio and pH was systematically investigated. For the surfactin/CTAB micellar system with a mass ratio varied from 1/11 to 4/8, the viscosity of the micelles rose to a maximum with increasing pH, and then decreased with a further increase of pH. When the mass ratio was surfactin:CTAB = 2.5:9.5 (pH 5.72), the maximum viscosity of the micelle solution reached 8170 mPa. s. Meanwhile, the viscosity curve of the surfactin/CTAB systems was described by the nonlinear co‐rotational Jeffreys model. This work sets a rheological foundation for the application of surfactin/CTAB systems. The thixotropic loop area of the micelles was basically zero. Through viscoelasticity measurements, the results demonstrated that the appropriate surfactin/CTAB mass ratio would favor the stability of the network structure of the synergistic thickening system. The value of G″(viscous modulus) is always higher than the value of G′ (elastic modulus).

中文翻译：

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表面肌动蛋白和十六烷基三甲基溴化铵混合胶束溶液的协同流变行为

本文研究了由表面活性素和十六烷基三甲基溴化铵（CTAB）形成的新型粘弹性增稠胶束体系的流变性能。表面活性素和CTAB的总浓度保持在12重量％。系统研究了不同质量比和pH值的表面活性素/ CTAB协同胶束的流变行为。对于质量比从1/11到4/8的表面活性素/ CTAB胶束系统，胶束的粘度随着pH的增加而上升到最大值，然后随着pH的进一步增加而下降。当质量比为表面活性素∶CTAB ＝ 2.5∶9.5（pH 5.72）时，胶束溶液的最大粘度达到8170mPa。s。同时，surfactin / CTAB系统的粘度曲线由非线性同向旋转Jeffreys模型描述。这项工作为surfactin / CTAB系统的应用奠定了流变学基础。胶束的触变环面积基本上为零。通过粘弹性测量，结果表明适当的表面活性素/ CTAB质量比将有利于增稠增效体系网络结构的稳定性。G”（粘弹性模量）的值始终高于G'（弹性模量）的值。