Viscoelastic solution of long polyoxyethylene chain phytosterol/monoglyceride/water systems |
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Authors: | Suraj Chandra Sharma Lok Kumar Shrestha Kenichi Sakai Hideki Sakai Masahiko Abe |
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Institution: | (1) Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda , Chiba 278-8510, Japan;(2) Graduate School of Environment and Information Sciences, Yokohama National University, Tokiwadai 79-7, Hodogaya-ku, Yokohama 240-8501, Japan;(3) Institute of Colloid and Interface Science, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku, Tokyo 162-8601, Japan |
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Abstract: | We have studied the rheology and structure of a mixed long polyoxyethylene chain phytosterol (PhyEO30) and monoglyceride (monolaurin (ML) or monopalmitin (MP)) surfactants in an aqueous system. Both ML and MP are insoluble
in 10 wt.% PhyEO30 solution at normal room temperature, but their solubility is found to increase with the rise of temperature and an isotropic
solution is formed at higher temperature. A maximum viscosity as a function of temperature appears as ML or MP is solubilized
in the micellar solution of PhyEO30. With increasing temperature, viscosity increases rapidly for higher monoglyceride content and forms viscoelastic solution.
The oscillatory rheological behavior of the viscoelastic solution can be described by Maxwell model at low-frequency region,
which is the typical pattern of entangled wormlike micelles. Upon successive increase in temperature, the viscosity decreases
and ultimately a phase separation occurs. Small-angle X-ray scattering measurements were performed to provide a supportive
structural evidence for the rheological data. |
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