(Liquid + liquid) phase equilibrium and critical behavior of binary solution {heavy water + 2,6-dimethylpyridine} |
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| Institution: | 1. School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, China;2. Department of Chemistry, Lanzhou University, Lanzhou, Gansu 730000, China;1. Department of Analytical and Environmental Chemistry and Szentágothai Research Center, University of Pécs, Ifjúság útja 6, H-7624 Pécs, Hungary;2. MTA–PTE Molecular Interactions in Separation Science Research Group, Ifjúság útja 6, H-7624 Pécs, Hungary;1. Mettler-Toledo GmbH, Sonnenbergstrasse 74, CH-8603 Schwerzenbach, Switzerland;2. Rapid Technologies Center, BMW Group, Knorrstrasse 147, D-80788 Munich, Germany;1. Institute of Thermal Physics, Ural Branch, Russian Academy of Sciences, Amundsena St. 107a, Ekaterinburg 620016, Russian Federation;2. Joint Institute for High Temperatures, Russian Academy of Sciences, Izhorskaya St. 13/19, Moscow 125412, Russian Federation |
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| Abstract: | The (liquid + liquid) coexistence curves, the isobaric heat capacities per unit volume and the turbidities for the binary solution of {heavy water + 2,6-dimethylpyridine} have been precisely measured. The values of the critical exponents were obtained, which confirmed the 3D-Ising universality. It was found that the critical temperature dropped by 5.9 K and the critical amplitude of the coexistence curve significantly increased as compared to the binary solution of {water + 2,6-dimethylpyridine}. The complete scaling theory was applied to well describe the asymmetric behavior of the diameter of the coexistence curve as the heat capacity contribution was considered. Moreover, the values of the critical amplitudes of the correlation length and the osmotic compressibility were deduced, which together with the critical amplitudes of the coexistence curve and the heat capacity to test universal amplitude ratios. |
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| Keywords: | Heat capacity Turbidity Complete scaling theory Asymmetric coefficient Universal amplitude ratios Deuterium effect |
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