Chinese Journal of Magnetic Resonance >
Exchange Kinetics of Surfactants TX-100 and CTAB Investigated by 1H NMR Spectroscopy
Received date: 2015-09-09
Revised date: 2016-07-11
Online published: 2016-09-05
The critical micelle concentration (CMC) of Triton X-100 (TX-100) and cetyltrimethylammonium bromide (CTAB) was measured by nuclear magnetic resonance (NMR) technologies at different temperature. The average residence time of TX-100 and CTAB were determined by one-dimensional line shape analysis. The average residence time of both compounds decreased with increasing temperature, suggesting that the rate of TX-100 and CTAB molecules entering/leaving the micelles increased with temperature. The apparent activation energy of the exchange process was calculated with the Arrhenius equation, and found to be 17.6 kJ/mol for TX-100 and 75.3 kJ/mol for CTAB. The apparent activation energy likely reflected the strength of hydrophobic interaction; while the average residence time depended not only on the hydrophobic interaction but also on the molecular structure.
YU Gang-jin , LIU Jun , MAO Shi-zhen , LIU Mai-li , DU You-ru . Exchange Kinetics of Surfactants TX-100 and CTAB Investigated by 1H NMR Spectroscopy[J]. Chinese Journal of Magnetic Resonance, 2016 , 33(3) : 422 -431 . DOI: 10.11938/cjmr20160307
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