RTI uses cookies to offer you the best experience online. By clicking “accept” on this website, you opt in and you agree to the use of cookies. If you would like to know more about how RTI uses cookies and how to manage them please view our Privacy Policy here. You can “opt out” or change your mind by visiting: http://optout.aboutads.info/. Click “accept” to agree.
Pressure dependence on the critical micelle concentration of a nonionic surfactant in water studied by H-1-NMR
Lesemann, M., Thirumoorthy, K., Kim, Y. J., Jonas, J., & Paulaitis, M. E. (1998). Pressure dependence on the critical micelle concentration of a nonionic surfactant in water studied by H-1-NMR. Langmuir, 14(19), 5339 - 5341. https://doi.org/10.1021/la9805692
The critical micelle concentration (cmc) of the nonionic surfactant C8E5 in D2O was measured at 30 °C and pressures up to 350 MPa using 1H-NMR chemical shifts. The cmc was found to increase with pressure up to approximately 150 MPa and then decrease at higher pressures. This characteristic pressure dependence is similar to that reported for several ionic surfactant solutions and is in quantitative agreement with the effect of pressure on the transfer of hydrocarbons from water into nonpolar solvents. We conclude, therefore, that the observed behavior is independent of the hydrophilic headgroup of the surfactant and that it reflects a pressure-induced destabilization of the hydrophobic micelle interior at low pressures and enhanced stabilization at high pressures.