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Effects of long-chain alcohols on the micellar properties of anionic surfactants in non-aqueous solutions by titration microcalorimetry

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Abstract

The power–time curves of micellar formation of two anionic surfactants, sodium laurate (SLA) and sodium dodecyl sulfate (SDS), in N,N-dimethyl acetamide (DMA) in the presence of various long-chain alcohols (1-heptanol, 1-octanol, 1-nonanol and 1-decanol) were measured by titration microcalorimetry at 298 K. The critical micelle concentrations (CMCs) of SLA and SDS under various conditions at 298 K were obtained based on the power–time curves. Thermodynamic parameters (\( \Updelta H^\circ_{\text{mic}} \), \( \Updelta S^\circ_{\text{mic}} \) and \( \Updelta G^\circ_{\text{mic}} \)) for micellar systems at 298 K were evaluated according to the power–time curves and the mass action model. The influences of the number of carbon-atom and the concentration of alcohol were investigated. Moreover, combined the thermodynamic parameters at 303, 308 and 313 K in our previous work and those of 298 K in the present work for SLA and SDS in DMA in the presence of long-chain alcohols, an enthalpy–entropy compensation effect was observed. The values of the enthalpy of micellization calculated by direct and indirect methods were made a comparison.

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Acknowledgments

The authors are grateful to the Natural Scientific Foundation (Z2007B03) and the Technology Development Project (2006GG2206004) of Shandong Province of China and the Doctoral Fund of the Ministry of Education of China (New Teachers Fund) (070422047) and the Opening Fund of Key Laboratory of Colloid & Interface Chemistry, Ministry of Education, Shandong University of China (200704).

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Authors and Affiliations

  1. Ministry of Education, Key Lab for Colloid and Interface Chemistry of Shandong University, Jinan, 250100, People’s Republic of China

    Y. Li, G. Fei, L. Zhen, Z. Liqiang & L. Ganzuo

  2. College of Chemical Science, Qufu Normal University, Qufu Shandong, 273165, People’s Republic of China

    Z. Honglin

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  1. Y. Li
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  2. G. Fei
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  3. Z. Honglin
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  4. L. Zhen
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  5. Z. Liqiang
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  6. L. Ganzuo
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Correspondence to Y. Li.

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Li, Y., Fei, G., Honglin, Z. et al. Effects of long-chain alcohols on the micellar properties of anionic surfactants in non-aqueous solutions by titration microcalorimetry. J Therm Anal Calorim 96, 859–864 (2009). https://doi.org/10.1007/s10973-009-0059-7

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  • DOI: https://doi.org/10.1007/s10973-009-0059-7

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