Abstract
The surface phase behavior and micellar properties of two nonionic surfactants, namely, ethylene glycol mono n-dodecyl ether (EGDE) and ethylene glycol mono n-tetradecyl ether (EGTE), have been investigated at different temperatures. From the study of film balance and Brewster angle microscopy (BAM), it has been observed that both of the amphiphiles show a first-order phase transition indicating conspicuous cusp points in their respective adsorption isotherms. This is further confirmed by the observation of bright 2-D condensed domains at the solution surfaces just after the appearance of the cusp points in the adsorption isotherms. Each of the above amphiphiles has a definite temperature above which they cannot show any indicative feature of phase transition, even with solutions of concentration above the critical micelle concentration (CMC) of the amphiphiles. These temperatures are found to be 23 and 37 °C for EGDE and EGTE, respectively. The CMC values of the amphiphiles increase with increasing tempe...
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