Mechanism of surfactant micelle formation

Langmuir : the ACS Journal of Surfaces and Colloids
Xiaohong CuiYouru Du

Abstract

The mechanism of micelle formation of surfactants sodium dodecyl sulfate (SDS), n-hexyldecyltrimethylammonium bromide (CTAB) and Triton X-100 (TX-100) in heavy water solutions was studied by 1H NMR (chemical shift and line shape) and NMR self-diffusion experiments. 1H NMR and self-diffusion experiments of these three surfactants show that their chemical shifts (delta) begin to change and resonance peaks begins to broaden with the increase in concentration significantly below their critical micelle concentrations (cmc's). At the same time, self-diffusion coefficients ( D) of the surfactant molecules decrease simultaneously as their concentrations increase. These indicate that when the concentrations are near and lower than their cmc's, there are oligomers (premicelles) formed in these three surfactant systems. Carefully examining the dependence of chemical shift and self-diffusion coefficient on concentration in the region just slightly above their cmc's, one finds that the pseudophase transition model is not applicable to the variation of physical properties (chemical shift and self-diffusion coefficient) with concentration of these systems. This indicates that premicelles still exist in this concentration region along with the...Continue Reading

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Citations

Oct 12, 2013·Journal of Colloid and Interface Science·Akihiro ShimamuraJames B Metson
Apr 6, 2011·Journal of the American Chemical Society·Niladri Patra, Petr Král
Apr 12, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Paula CaregnatoMalcolm D E Forbes
Sep 29, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Sharmistha Dutta ChoudhuryJyotirmayee Mohanty
Aug 14, 2013·Physical Chemistry Chemical Physics : PCCP·Philip S Salmon, Anita Zeidler
Mar 26, 2009·The Journal of Chemical Physics·Radina Hadgiivanova, Haim Diamant
Jan 26, 2010·The Journal of Chemical Physics·Suliman Barhoum, Anand Yethiraj
Feb 6, 2013·The Journal of Physical Chemistry. B·María Figueira-GonzálezPedro Rodríguez-Dafonte
Sep 11, 2013·The Journal of Physical Chemistry. B·Jia-Hsien LinSheng-Shu Hou
Mar 2, 2012·Langmuir : the ACS Journal of Surfaces and Colloids·J P Vivek, Ian J Burgess
Nov 21, 2012·Langmuir : the ACS Journal of Surfaces and Colloids·Amalia MezeiRamon Pons
Aug 10, 2013·Langmuir : the ACS Journal of Surfaces and Colloids·María Méndez-PérezMoisés Pérez-Lorenzo
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