کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
204083 460697 2008 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Molecular interactions in binary mixtures of formamide with 1-butanol, 2-butanol, 1,3-butanediol and 1,4-butanediol at different temperatures: An ultrasonic and viscometric study
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Molecular interactions in binary mixtures of formamide with 1-butanol, 2-butanol, 1,3-butanediol and 1,4-butanediol at different temperatures: An ultrasonic and viscometric study
چکیده انگلیسی

The ultrasonic speeds, u and viscosities, η of binary mixtures of formamide (FA) with 1-butanol, 2-butanol, 1,3-butanediol and 1,4-butanediol, including those of pure liquids, over the entire composition range were measured at temperatures 293.15, 298.15, 303.15, 308.15, 313.15 and 318.15 K. From the experimental u and η data, the deviations in isentropic compressibility, Δks, in ultrasonic speed, Δu, and in viscosity, Δη   were calculated. The partial molar compressibilities, K¯m,1 and K¯m,2 of FA and alkanol in the mixtures over the whole composition range and K¯m,1° and K¯m,2° at infinite dilution and excess partial molar compressibilities, K¯m,1E and K¯m,2E, over the whole composition range and K¯m,1°E and K¯m,2°E at infinite dilution were calculated by using two different approaches. The variations of these parameters with composition and temperature of the mixtures are discussed in terms of molecular interaction in these mixtures. It is observed that the FA-alkanol interactions in these mixtures follows the order: 1-butanol < 2-butanol < 1,3-butanediol < 1,4-butanediol. The effect of the number and position of the hydroxyl groups in these alkanol molecules on the molecular interactions in these mixtures is discussed. Furthermore, the free energies, ΔG*, enthalpies, ΔH*, and entropies, ΔS* of activation of viscous flow have also been obtained by using Eyring viscosity equation. The dependence of ΔG*, ΔH* and ΔS* on composition of the mixtures have been discussed.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Fluid Phase Equilibria - Volume 265, Issues 1–2, 25 March 2008, Pages 46–56
نویسندگان
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