Hexadecyltrimethylammonium bromide micellization in glycine, diglycine, and triglycine aqueous solutions as a function of surfactant concentration and temperatures

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• 作者：Anwar Ali (1)
  Nisar Ahmad Malik (1)
  Sahar Uzair (1)
  Maroof Ali (1)
  Mohammad Faiz Ahmad (1)
  
• 关键词：conductance ; fluorescence ; micellization ; surfactant ; amino acid/peptides interactions ; micellization
• 刊名：Russian Journal of Physical Chemistry A, Focus on Chemistry
• 出版年：2014
• 出版时间：June 2014
• 年：2014
• 卷：88
• 期：6
• 页码：1053-1061
• 全文大小：
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• 作者单位：Anwar Ali (1)
  Nisar Ahmad Malik (1)
  Sahar Uzair (1)
  Maroof Ali (1)
  Mohammad Faiz Ahmad (1)
  
  1. Department of Chemistry, Jamia Millia Islamia (Central University), New Delhi, 110025, India
  
• ISSN：1531-863X

文摘

Micellization behavior of hexadecyltrimethylammonium bromide (HTAB) was investigated conductometrically in aqueous solutions containing 0.02 mol kg?glycine (Gly), diglycine (Gly-Gly), and triglycine (Gly-Gly-Gly) as a function of surfactant concentration at different temperatures. The critical micelle concentration (CMC) of HTAB exhibits a decreasing trend as the number of carbon atoms increases from Gly to Gly-Gly-Gly, favoring the micelle formation. The values of CMC and the degree of counterion dissociation of the micelles were utilized to evaluate the standard free energy for transferring the surfactant hydrophobic chain out of the solvent to the interior of the micelle, ΔG HP ?/sup> , free energy associated with the surface contributions, ΔG S ?/sup> , standard free energy, ΔG m ?/sup> , enthalpy, ΔH m ?/sup> , and entropy, ΔS m ?/sup> of micellization were also calculated. The results show that the micellization of HTAB in aqueous solutions as well as in aqueous Gly/Gly-Gly/Gly-Gly-Gly solutions is primarily governed by the entropy gain due to the transfer of the hydrophobic groups of the surfactant from the solvent to the interior part of the micelle. The CMC obtained by fluorometric method is in close agreement with those obtained conductometrically. Furthermore, decrease in the I 1/I 3 ratio of pyrene fluorescence intensity suggests the solubilization of the additives by the surfactant micelles and that this solubilization increases as the hydrophobicity increases from Gly to Gly-Gly-Gly.