Apparent molar volumes and viscosity B-coefficients of caffeine in aqueous thorium nitrate solutions at T = (298.15, 308.15, and 318.15) K

被引:31
|
作者
Sinha, Biswajit [1 ]
Roy, Pran Kumar [1 ]
Sarkar, Bipul Kumar [1 ]
Brahman, Dhiraj [1 ]
Roy, Mahendra Nath [1 ]
机构
[1] Univ N Bengal, Dept Chem, Darjeeling 734013, India
来源
JOURNAL OF CHEMICAL THERMODYNAMICS | 2010年 / 42卷 / 03期
关键词
Apparent molar volumes; Viscosity B-coefficients; Caffeine; Thorium nitrate; AMINO-ACIDS; HEAT-CAPACITIES; ADIABATIC COMPRESSIBILITIES; CHLORIDE SOLUTIONS; SELF-ASSOCIATION; WATER; 25-DEGREES-C; MIXTURES; PRESSURE; ACETATE;
D O I
10.1016/j.jct.2009.09.010
中图分类号
O414.1 [热力学];
学科分类号
摘要
Apparent molar volumes phi(v) and viscosity B-coefficients for caffeine in (0.00, 0.03, 0.05, and 0.07) mol . dm(-3) aqueous thorium nitrate, Th(NO(3))(4), solutions were determined from solution density and viscosity measurements over the temperature range (298.15 to 318.15) K as function of concentration of caffeine and the relation: phi degrees(v) = a(0) + a(1)T + a(2)T(2), have been used to describe the temperature dependence of the standard partial molar volumes phi degrees(v). These results have been used to deduce the standard volumes of transfer Delta phi degrees(v) and viscosity B-coefficients of transfer Delta B for caffeine from water to aqueous Th(N03)4 solutions for rationalizing various interactions in the ternary solutions. The structure making or breaking ability of caffeine has been discussed in terms of the sign of (delta(2)phi degrees(v)/delta T(2))(P). The Friedman-Krishnan co-sphere model was used to explain the transfer volume of caffeine with increasing Th(NO(3))(4) molarity. The activation parameters of viscous flow for the ternary solutions were also discussed in terms of transition state theory. (C) 2009 Elsevier Ltd. All rights reserved.
引用
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页码:380 / 386
页数:7
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