Citation: Wei Zhou, Wei Da Xu, Yu Mei Sun, Ya Wen Zhou. Phases confirmation of cloudy Silwet L-77 aqueous solution by dielectric relaxation spectroscopy[J]. Chinese Chemical Letters, ;2010, 21(6): 734-737. doi: 10.1016/j.cclet.2010.01.026 shu

Phases confirmation of cloudy Silwet L-77 aqueous solution by dielectric relaxation spectroscopy

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

Received Date: 4 November 2009

Fund Project: This work was financially supported by Beijing Municipal Commission of Education.

The phase transition of Silwet L-77 (a kind of siloxane surfactant) dilute aqueous solution with temperature was investigated by dielectric relaxation spectroscopy. In the initial heating process, a dielectric relaxation was found at about 10⁶ Hz, which was considered as the interface polarization ascribed to the interface between water and liquid phases (W and L₁). With the temperature increasing further, a new dielectric relaxation was observed at about 10⁴ Hz, which was assigned to the appearance of liquid crystal phase (L_α). According to the dielectric parameters fitted by Cole-Cole equation, the coexistence temperature of W, L₁ and L_α was determined at about 37.0℃.
- Dielectric relaxation,
- Silwet L-77,
- Phase transition
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