Abstract
AbstractsA simple method is described for measuring the critical micelle concentration (CMC) of surfactants using a computer‐driven mixing system and a variable wavelength spectrophotometer. Analyses using this method were typically done in 15 min. Detergents that were analyzed included sodium dodecyl sulfate (SDS), sodium cholate, Lubrol‐PX and Triton X‐100. Lubrol PX showed two phase transitions; other detergents appeared to have only one near their CMC. For sodium cholate, the CMC was more difficult to analyze than the others. This may have been due to its low aggregation number (≤ 4). Since this method successfully identified the CMC of these four detergents, it is likely that most, if not all, surfactants can be analyzed in the same manner.
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