Alkane-tolerant worm-like micelles based on assembled surfactants


题目:Alkane-tolerant worm-like micelles based on assembled surfactants





Self-assembly of surfactants in aqueous solution can form a variety of aggregate structures, among which worm-like micelles (WLMs) have attracted much attention due to their excellent viscoelasticity. The addition of oil often leads to a decrease in the viscosity of WLMs, which is closely related to the location of oil dissolution within the WLMs. Whether oil could induce a viscosity increase in WLMs caught our attention. In order to explore the effect of alkanes on the microstructure of different WLMs systems, three WLMs systems were prepared using three surfactants: oleic acid-N,N-dimethylcyclohexylamine (OA-DMCHA), sodium oleate-chlorinated sodium (NaOA-NaCl) and cetyltrimethylammonium bromide-sodium salicylate (CTAB-NaSA). The changes of parameters such as viscosity, microstructure and hydrodynamic radius of these systems before and after the introduction of alkanes were analyzed. The relationship between the alkane concentration and the interlayer spacing of the lamellar phase was investigated by small angle X scattering (SAXS). Except for OA-DMCHA, the structures of the other two systems were destroyed after the addition of alkanes. Considering the solubility of surfactants in organic alkanes, it was found that alkanes can enter the hydrophobic barrier layer of OA-DMCHA. The initial WLMs transformed into a layered phase, and the interlayer spacing of the layered phase increased with increasing alkane concentration.


刘东芳,博士 ,硕士导师。主要研究方向为表面活性剂的自组装、乳液、微乳液、纳米乳液的制备及应用。同时对于刺激响应表面活性剂及其在改变油水界面性质领域进行了较为深入的研究工作。先后在LangmuirSoft MatterEnergy & Fuels等期刊发表SCI论文10余篇。

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