Physicochemical studies of 2-propanol in some micellar solutions

Abstract

<span style="font-size:14.0pt;font-family:" times="" new="" roman";="" mso-fareast-font-family:"times="" roman";mso-ansi-language:en-us;mso-fareast-language:="" en-us;mso-bidi-language:ar-sa"="">Conductance values of sodium dodecyl sulphate and dodecyl trimethyl ammonium bromide have been measured in aqueous and 2-propanol+water solutions. The measurements are carried out at 298.15, 308.15 and 318.15 K. From conductivity data the values of critical micelle concentration and counterion association constant (<img src='/image/spc_char/alpha.gif' border=0>) are determined. The observed thermodynamic data reveals that micellisation process is favoured both energetically as w<span style="font-size:14.0pt;font-family:HiddenHorzOCR;mso-hansi-font-family:" times="" new="" roman";="" mso-bidi-font-family:hiddenhorzocr;mso-ansi-language:en-us;mso-fareast-language:="" en-us;mso-bidi-language:ar-sa"="">ell <span style="font-size:14.0pt; font-family:" times="" new="" roman";mso-fareast-font-family:"times="" roman";="" mso-ansi-language:en-us;mso-fareast-language:en-us;mso-bidi-language:ar-sa"="">as by entropy gain. ¹H NMR data of solutions indicate that whereas 2-propanol is solubilised in the interior of SDS micelles, the penetration of 2-propanol into DTAB micelles is comparatively weak.</span></span></span></span></span>