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Interfacial and aggregation properties of aqueous sodium N-dodecanoylsarcosinate solutions at different pH

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Abstract

The pH dependence of an anionic surfactant, sodium N-dodecanoylsarcosinate (SLAS), has been studied by measuring interfacial tension, fluorescence, dynamic light scattering, etc., in aqueous solutions with phosphate and borate buffers. The interfacial tension (γ) of SLAS decreases remarkably with a pH decrease and is constant at pH > 7.3. The observed values for the critical micelle concentration (cmc) and the surfactant concentration at which its γ value is reduced by 20 mN/m from that of pure water (C 20) decrease with a pH decrease, while those also become constant at pH > 6.5 and >7.3, respectively. On the other hand, the interfacial excess of SLAS increases at pH < 7.3. These interfacial behaviors have been further investigated by the addition of Tl+ which replaces Na+ of SLAS. The observed γ values of LAS− with the different counter cations are in the order of H+ < Tl+ < Na+. In order to reveal aggregation properties of SLAS, the aggregation number (N agg), the micropolarity, the hydrodynamic radius (R h) of micelle, and the fluorescence anisotropy of Rhodamine B (r) have been evaluated at various pHs. The N agg value shows a decreasing tendency with a pH increase. The I 1/I 3 ratio and the R h values do not strongly depend on pH. The r value decreases until pH 7 and remains constant at pH > 7.0. These interfacial and micelle properties have been discussed in detail considering the electrostatic interaction and the molecular structures of the hydrophilic headgroup.

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Acknowledgments

We are grateful to Prof. H. Tsukube (Graduate School of Science, Osaka City University, Japan) for his helpful assistance in the steady-state fluorescence and dynamic light-scattering measurements, to Prof. T. Nagasaki (Graduate School of Engineering, Osaka City University, Japan) for his helpful assistance in the fluorescence anisotropy measurements, and also to Prof. Y. Morimoto (Graduate School of Science, Osaka City University, Japan) for his helpful comments on the discussion of resonate structures, (Z)-LAS− and (E)-LAS−. PS is grateful to the Japan Society for the Promotion of Science (JSPS) for postdoctoral fellowship award.

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Authors and Affiliations

  1. Department of Chemistry, Graduate School of Science, Osaka City University, Sumiyoshi-ku, Osaka, 558-8585, Japan

    Akihisa Kaneko & Hidekazu Doe

  2. Department of Physiology and Biophysics, Aarhus University, Ole Worms Alle 6, 1180, DK-Aarhus C, Denmark

    Pankaj Sehgal

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  1. Akihisa Kaneko
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  2. Pankaj Sehgal
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Correspondence to Hidekazu Doe.

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Kaneko, A., Sehgal, P. & Doe, H. Interfacial and aggregation properties of aqueous sodium N-dodecanoylsarcosinate solutions at different pH. Colloid Polym Sci 290, 323–330 (2012). https://doi.org/10.1007/s00396-011-2551-4

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  • DOI: https://doi.org/10.1007/s00396-011-2551-4

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