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Effect of alcohols on the micellar properties in aqueous solution of alkyltrimethylammonium bromides

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Abstract

The effect ofn-butanol,n-propanol, andn-hexanol on the critical micelle concentration (CMC) and degree of ionisation of the micelles of dodecyl-, tetradecyl- and hexadecyltrimethylammonium bromides in aqueous solution has been determined by conductimetric techniques. Increase of the molality of added alcohol over the concentration ranges examined (up to 0.3 mol kg−1 butanol, 0.07 mol kg−1 pentanol and 0.025 mol kg−1 hexanol) caused a progressive decrease of CMC and increase of the degree of ionisation for each surfactant-alcohol system. At a constant molality of added alcohol the degree of ionisation increased with a) an increase of the chain length of the surfactant for each alcohol and b) an increase of the chain length of the alcohol for each surfactant. The distribution of each alcohol between the aqueous and micellar phases and the free energy of solubilization were determined from the change of CMC with molality of added alcohol.

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Attwood, D., Mosquera, V., Rodriguez, J. et al. Effect of alcohols on the micellar properties in aqueous solution of alkyltrimethylammonium bromides. Colloid Polym Sci 272, 584–591 (1994). https://doi.org/10.1007/BF00653225

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Key words

  • Critical micelle concentration (CMC)
  • degree of micellar ionisation
  • alcohols, effect on CMC
  • micelles of alkyltrimethylammonium bromides
  • solubilization
  • distribution coefficients