Rheological property and rheokinetics of novel photogelling fluids |
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| Authors: | Qingbin Liu Bo Fang Zhiliang Xu |
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| Affiliation: | 1. School of Chemical Engineering, East China University of Science and Technology, Shanghai, China;2. Shanghai Key Laboratory of Multiphase Materials Chemical Engineering, Lab of Chemical Engineering Rheology, Research Center of Chemical Engineering, East China University of Science and Technology, Shanghai, China |
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| Abstract: | A novel photorheological fluid composed of cationic Gemini surfactant N, N’-bis (octadecyl dimethyl)-1, 2-dichloride-propyl ammonium salt (C18-3-C18) and trans-ortho-methoxycinnamic acid (trans-OMCA) was investigated. When C18-3-C18 and trans-OMCA are mixed in equimolar quantities, the result is a low-viscosity Newtonian fluid with no thixotropy. After irradiation by UV light (365?nm), trans-OMCA is converted to cis-OMCA, and in turn, the solution undergoes more than 50 fold increase in the relative viscosity and exhibits shear thinning and thixotropy. The viscosity rise is associated with the formation of wormlike micellar network in the solution, which was confirmed by cryo-scanning electron microscopy (cryo-SEM). Furthermore, the rheokinetics process of the C18-3-C18/trans-OMCA solutions during UV irradiation was studied and rheokinetics equation was established, which can well describe the dynamic changing of the rheological properties. Critical packing parameter was introduced to explain the mechanism of photo-induced micelle transition. |
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| Keywords: | Cationic gemini surfactant photosensitive rheokinetics |
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