Influence of nano-SiO₂ on dilational viscoelasticity of liquid/air interface of cetyltrimethyl ammonium bromide

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• 作者：Huanrong Wang ; Yong Gong ; Weichang Lu ; Banglin Chen
• 关键词：Nano-SiO₂ ; Cetyltrimethyl ammonium bromide (CTAB) ; Liquid/air interface ; Dilational viscoelasticity ; Relaxation process
• 刊名：Applied Surface Science
• 出版年：2008
• 出版时间：30 March 2008
• 年：2008
• 卷：254
• 期：11
• 页码：3380-3384
• 全文大小：445 K

文摘

An investigation was reported on the interfacial rheology of nano-SiO₂ dispersions in the presence of cetyltrimethyl ammonium bromide (CTAB). The interfacial dilational viscoelasticity had been measured as a function of the nano-particle concentration. The properties of the interface were affected by different processes such as the surfactants adsorption at the liquid or at the particle interfaces. It was found that the influence of nano-SiO₂ particles on the interfacial properties was evident and complex. The property of SiO₂ particles would change from hydrophilic to hydrophobic when CTAB molecules absorbed at their surface. The reorganization of surfactants and the participation of hydrophobic SiO₂ at the surface were offered to explain the process. In particular, the interaction between surfactants and particles, and the transfer of particles from bulk to the surface played an important role in changing the properties of the interface.