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Investigation of the micellization process of single and gemini surfactants from arginine by SAXS, NMR self-diffusion, and light scattering

AuthorsPérez, Lourdes ; Pinazo Gassol, Aurora ; Infante, María Rosa ; Pons Pons, Ramon
KeywordsAggregation behavior
Gemini cationic surfactants
Single-chain homologue
Antimicrobial propertis
Issue Date7-Sep-2007
PublisherAmerican Chemical Society
CitationThe Journal of Physical Chemistry B 111(39): 11379-11387 (2007)
AbstractWe have investigated the aggregates formed by gemini and single-chain cationic surfactants with arginine head groups in dilute solutions by combining SAXS, static and dynamic light scattering, and PGSE NMR techniques. 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 micellar shape, i.e., aggregation numbers and geometrical dimensions, were evaluated from the analysis of the SAXS and NMR data. These structural parameters are in good agreement with those determined previously by surface tension and cryo-TEM studies. Some divergences were obtained using the light scattering technique, in which case the shapes of the aggregates formed by the single-chain surfactant were not in accordance with those obtained by SAXS and NMR spectroscopy.
Description9 pages, 10 figures.-- PMID: 17824636 [PubMed].-- Supplementary information (5 pages) available at: http://pubs.acs.org/doi/suppl/10.1021/jp071121p/suppl_file/jp071121psi20070528_064839.pdf
Printed version published on Oct 4, 2007.
Publisher version (URL)http://dx.doi.org/10.1021/jp071121p
Appears in Collections:(IQAC) Artículos
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