AI Article Synopsis
- The study introduces a new method using capillary electrophoresis (CE) to measure critical micelle concentrations (CMCs) of surfactants.
- The technique involves monitoring how solution viscosity changes as surfactant concentrations increase, particularly highlighting a drastic shift when reaching the CMC.
- CMC values for four common anionic surfactants were accurately determined and compared favorably with existing literature, along with application on less-studied nonionic surfactants.
Article Abstract
This work demonstrates a novel, convenient utilization of capillary electrophoresis (CE) instrumentation for the determination of critical micelle concentrations (CMCs). Solution viscosity differences across a range of surfactant concentrations were monitored by hydrodynamically forcing an analyte towards the detector. Upon reaching the surfactant's CMC value, migration times were observed to change drastically. CMC values for four commonly employed anionic surfactants were determined-sodium dodecyl sulfate: 8.1mM; sodium caprylate: 300 mM; sodium decanoate: 86 mM; sodium laurate: 30 mM; and found to be in excellent agreement with values previously reported in the literature. The technique was then applied to the less well-characterized nonionic surfactants poly(oxyethylene) 8 myristyl ether (CMC approximately 9 M), poly(oxyethylene) 8 decyl ether (CMC approximately 0.95 mM) and poly(oxyethylene) 4 lauryl ether.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2784175 | PMC |
| http://dx.doi.org/10.1016/j.chroma.2009.09.026 | DOI Listing |
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