کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
217373 1426326 2007 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Isothermal compressibility and internal pressure studies of some non-electrolytes in aqueous solutions at low temperatures
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Isothermal compressibility and internal pressure studies of some non-electrolytes in aqueous solutions at low temperatures
چکیده انگلیسی

The experimental data of density (ρ) and sound velocity (u) in the temperature range (275.15 to 293.15) K have been obtained for the systems (dioxane + water), (dimethylformamide + water), (tetrahydrofuran + water), and (acetonitrile + water). The specific heat (Cp) data for the above systems have been obtained at T = 279.15 K. The data obtained are used to calculate the derived parameters of adiabatic compressibility (βS), at T = 275.15 K to T = 283.15 K, isothermal compressibility (βT), and internal pressure (Pi) at T = 279.15 K for different concentrations. The solute properties: apparent molar volume (ϕV), apparent molar expansivity (ϕE), and apparent molar compressibility (ϕKS) have been studied and the limiting values for these properties are reported. The variation in apparent molar properties with concentration and the corresponding temperature and pressure effects are discussed in terms of hydrophobic hydration (–H bonding interaction) and hydrophobic interaction (non-polar group solute–solute association in water). It is noted that the internal pressure of solutions is quite insensitive in the region of solute–solute association, while its variation with concentration in the dilute region is sensitive in contrast to the aqueous alcohol solutions. The molecular interactions also exhibit individualistic behaviour and are much dependent on structural alterations in water structure.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: The Journal of Chemical Thermodynamics - Volume 39, Issue 4, April 2007, Pages 667–673
نویسندگان
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