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Application of the Extended Langmuir Model for the Determination of Lyophobicity of 1-Propanol in Acetonitrile

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Abstract

Surface tensions (σ) of binary liquid mixtures of acetonitrile (ACN) with 1-propanol (PrOH) were measured over the entire composition range at eight different temperatures, 278.15 K, 283.15 K, 288.15 K, 293.15 K, 298.15 K, 303.15 K, 308.15 K, and 313.15 K. The lyophobicities (β) of the surfactant PrOH relative to that of ACN as well as the surface mole fractions (\({x^{\rm S}_{2}}\)) of PrOH at various temperatures were derived using the extended Langmuir model (Langmuir 17, 4261, 2001). The β values indicate the greater affinity of PrOH for the surface, and this trend slightly increases with rising temperature. The determined \({x^{\rm S}_{2 }}\) values indicate that the surface concentration of PrOH is always higher than its bulk concentration and consequently confirm that the surface is enriched with PrOH.

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  1. Institut für Physik, Fachgebiet Chemie, Technische Universität Ilmenau, Weimarer Str. 25, 98693, Ilmenau, Germany

    Nikos G. Tsierkezos

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  1. Nikos G. Tsierkezos
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Correspondence to Nikos G. Tsierkezos.

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Tsierkezos, N.G. Application of the Extended Langmuir Model for the Determination of Lyophobicity of 1-Propanol in Acetonitrile. Int J Thermophys 30, 910–918 (2009). https://doi.org/10.1007/s10765-009-0581-7

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  • DOI: https://doi.org/10.1007/s10765-009-0581-7

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