Three Dimensional Phase-Sensitive AC Voltametry: A New Experimental Approach for the Study of Phase Transitions
A new methodology, which we name Three Dimensional Phase-Sensitive AC Voltametry, is proposed for the study of phase transitions in lyotropic liquid crystals. In this technique, we monitor the capacitance changes during adsorption of surface active compounds on mercury, as a function of both applied potential and time. The application method is applied to the case of a submicellar electrolytic solution of sodium dodecyl sulphate. It is seen that by means of the variation of the reconstructed C-E curves in time, not only short-time diffusion controlled processes but also long-time changes can be followed. The latter measurement is very useful in cases where phase changes proceed slowly.
KeywordsSodium Dodecyl Sulphate Sodium Dodecyl Sulphate Capacitance Curve Compact Layer Hanging Mercury Drop Electrode
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