Investigation of the Micellization Process of Single and Gemini Surfactants from Arginine by SAXS, NMR Self-Diffusion, and Light Scattering

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• 作者：Lourdes Pé ; rez ; Aurora Pinazo ; M. Rosa Infante ; Ramon Pons
• 刊名：Journal of Physical Chemistry B
• 出版年：2007
• 出版时间：October 4, 2007
• 年：2007
• 卷：111
• 期：39
• 页码：11379 - 11387
• 全文大小：135K
• 年卷期：v.111,no.39(October 4, 2007)
• ISSN：1520-5207

文摘

We have investigated the aggregates formed by gemini and single-chain cationic surfactants with argininehead groups in dilute solutions by combining SAXS, static and dynamic light scattering, and PGSE NMRtechniques. SAXS and NMR spectroscopy indicate that the single-chain homologue forms spheroidal aggregates,whereas the gemini surfactants form cylindrical micelles. The main parameters characterizing the micellarshape, i.e., aggregation numbers and geometrical dimensions, were evaluated from the analysis of the SAXSand NMR data. These structural parameters are in good agreement with those determined previously by surfacetension and cryo-TEM studies. Some divergences were obtained using the light scattering technique, in whichcase the shapes of the aggregates formed by the single-chain surfactant were not in accordance with thoseobtained by SAXS and NMR spectroscopy.