Citation: Ya Wen Zhou, Wei Zhou, Fu Han, Bao Cai Xu. Dielectric analysis on phase transition and micelle shape of polyoxyethylene trisiloxane surfactant in dilute aqueous solution[J]. Chinese Chemical Letters, ;2011, 22(6): 745-748. doi: 10.1016/j.cclet.2010.12.01 shu

Dielectric analysis on phase transition and micelle shape of polyoxyethylene trisiloxane surfactant in dilute aqueous solution

School of Chemistry and Environmental Engineering, Beijing Technology and Business University, Beijing 100048, China

Received Date: 11 October 2010

Fund Project: This work was supported by National Natural Science Foundation of China (No.21003005)and Funding Project for Academic Human Resources Development in Institutions of Higher Learning Under the Jurisdiction of Beijing Municipality (No.20110890)Beijing Municipal Commission of Education (No.KM201010011005)

The cloudy Silwet L-77 aqueous solution on the concentration range from 0.5% to 50% was investigated by dielectric relaxation spectroscopy.The concentration dependence of phase microstructure was confirmed by means of analyzing the dielectric parameters of bulk solution.The relaxation behavior was assigned to the interfacial polarization between the micelle and the medium, and the relaxation distribution parameter was used to figure the shape transition from sphere to ellipsoid with the concentration increasing.The synchronous reduction of permittivity and conductivity indicated the formation of the lamellar phase.As compensation, the quantity of the surfactant liquid phase gradually decreased, whose shape constantly kept ellipsoidal.
- Dielectric relaxation,
- Siloxane surfactant,
- Cloudy state,
- Phase microstructur
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