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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 10~6 Hz,which was considered as the interface polarization ascribed to the interface between water and liquid phases(W and L_1).With the temperature increasing further,a new dielectric relaxation was observed at about 10~4 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,L_1 and L_αwas determined at about 37.0℃.
The phase transition of Silwet L-77 (a kind of siloxane surfactant) dilute aqueous solution with temperature was investigated by dielectric relaxation spectroscopy. The initial heating process, a dielectric relaxation was found at about 10 ~ 6 Hz, which was considered as the interface polarization ascribed to the interface between water and liquid phases (W and L_1) .With the temperature acceleration further, a new dielectric relaxation was observed at about 10~4 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, L_1 and L_αwas determined at about 37.0 ° C.