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Sohrabi B, Gharibi H, Javadian S, et al. A new model to study the phase transition from microstructures to nanostructures in ionic/ionic surfactants mixture. J Phys Chem B. 2007;111(34):10069-78doi: 10.1021/jp073284j.
Sohrabi, B., Gharibi, H., Javadian, S., & Hashemianzadeh, M. (2007). A new model to study the phase transition from microstructures to nanostructures in ionic/ionic surfactants mixture. The journal of physical chemistry. B, 111(34), 10069-78. https://doi.org/10.1021/jp073284j
Sohrabi, Beheshteh, et al. "A new model to study the phase transition from microstructures to nanostructures in ionic/ionic surfactants mixture." The journal of physical chemistry. B vol. 111,34 (2007): 10069-78. doi: https://doi.org/10.1021/jp073284j
Sohrabi B, Gharibi H, Javadian S, Hashemianzadeh M. A new model to study the phase transition from microstructures to nanostructures in ionic/ionic surfactants mixture. J Phys Chem B. 2007 Aug 30;111(34):10069-78. doi: 10.1021/jp073284j. Epub 2007 Aug 08. PMID: 17685568.
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J Phys Chem B. 2007 Aug 30;111(34):10069-78. doi: 10.1021/jp073284j. Epub 2007 Aug 08.

A new model to study the phase transition from microstructures to nanostructures in ionic/ionic surfactants mixture.

The journal of physical chemistry. B

Beheshteh Sohrabi, Hussein Gharibi, Soheila Javadian, Majid Hashemianzadeh

Affiliations

  1. Department of Chemistry, Tarbiat Modarres University, P.O. Box 14155-4838, Tehran, Iran.

PMID: 17685568 DOI: 10.1021/jp073284j

Abstract

The phase behavior and aggregate structures of mixtures of the oppositely charged surfactants cetyltrimethyl ammonium bromide (CTAB) and sodium dodecyl sulfate (SDS) are explored at high dilution by pulsed field gradient stimulated echo (PFG-STE) NMR. The aggregation numbers and hydrodynamic radii of vesicles and mixed micelles were determined by a combination of viscosity and self-diffusion coefficient measurements. The average size of the mixed micelles was larger than that of micelles containing uniformly charged head groups. Analysis of the variations of the self-diffusion coefficient and viscosity with changing concentration of CTAB or SDS in the cationic-rich and anionic-rich regions revealed a phase transition from vesicles to mixed micelles. Differences in the lengths of the CTAB and SDS hydrophobic chains stabilize vesicles relative to other microstructures (e.g., liquid crystalline and precipitate phase), and vesicles form spontaneously over a wide range of compositions in both cationic-rich and anionic-rich solutions. The results obtained from conductometry measurements confirmed this transition. Finally, according to the capacitor model, a new model was developed for estimating the surface potentials and electrostatic free energy (g(elec)). Then we investigated the variations of electrostatic and transfer free energy in phase transition between mixed micelle and vesicle.

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