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Study of an Alcohol’s Influence on the CMC and Thermodynamic Functions of Anionic Surfactants in DMA/Long-chain Alcohol Solutions Using a Microcalorimetric Method

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Abstract

The power-time curves for the micelle formation process were determined for two anionic surfactants, sodium laurate (SLA) and sodium dodecyl sulfate (SDS), in mixed alcohol + N,N-dimethylacetamide (DMA) solvent using titration microcalorimetry. From the data of the lowest point and the area of the power-time curves, their critical micelle concentration (CMC) and ΔH om were obtained. The other thermodynamic functions of the micellization process (ΔG om and ΔS om ) were also calculated with thermodynamic equations. For both surfactants, the effects of the carbon number (chain length) of the alcohol, the concentration of alcohol, and the temperature on the CMC and thermodynamic functions are discussed. For systems containing identical concentrations of a different alcohol, values of the CMC, ΔH om and ΔS om increased whereas ΔG om decreased with increasing temperature. For systems containing an identical alcohol concentration at the same temperature, values of the CMC, ΔH om ,ΔG om and ΔS om decrease with increasing carbon number of alcohol. For systems containing the same alcohol at the same temperature, the CMC and ΔG om values increase whereas ΔH om and ΔS om decrease with increasing alcohol concentration.

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Authors and Affiliations

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

    Hong-Lin Zhang, Zhe Kong & Yong-Mei Yan

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

    Gan-Zuo Li, Li Yu & Fei Geng

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  1. Hong-Lin Zhang
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  2. Zhe Kong
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  3. Yong-Mei Yan
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  4. Gan-Zuo Li
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  5. Li Yu
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  6. Fei Geng
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Correspondence to Hong-Lin Zhang.

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Zhang, HL., Kong, Z., Yan, YM. et al. Study of an Alcohol’s Influence on the CMC and Thermodynamic Functions of Anionic Surfactants in DMA/Long-chain Alcohol Solutions Using a Microcalorimetric Method. J Solution Chem 37, 1631–1644 (2008). https://doi.org/10.1007/s10953-008-9290-2

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  • DOI: https://doi.org/10.1007/s10953-008-9290-2

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