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Study on thermophysical properties in the ternary mixture of N-methylglycine solute with (d-glucose + water) binary solvent at temperatures of 298.15, 308.15, and 318.15 K
Journal of Molecular Liquids ( IF 6 ) Pub Date : 2018-01-07 , DOI: 10.1016/j.molliq.2018.01.002
Florinela Sirbu , Ioana L. Gheorghe

Density, speed of sound and refractive index data were measured to eight molal concentrations of N-Methylglycine in aqueous d-Glucose for mixed ternary solutions. The molality of N-methylglycine solute is between 0.3140 and 1.2005 mol·kg−1 in 0.2052, 0.4201, 0.6455, and 0.8824 mol·kg−1 aqueous d-glucose solvent at temperatures of 298.15, 308.15, and 318.15 K and at atmospheric pressure. The relation between experimental data of refractive index and density has been good correlated with several empirical and semi-empirical equations like Lorentz–Lorenz, Dale–Gladstone, Eykman, Oster, Arago–Biot, Newton and Modified–Eykman. As well, the derived thermophysical properties as the apparent molar volumes, the standard partial molar volume, standard partial molar volumes of transfer from water to (d-glucose + H2O) solutions, isentropic compressibility coefficient, the estimation of the isentropic compressibility at infinite dilution, and solvation number were calculated from measured values of densities and speeds of sound. Finally, the molar refractivity in ternary mixture was computed using Lorentz-Lorenz equation. The influence of the amino acid and carbohydrate concentration on the thermophysical properties has been evidenced. The obtained values were interpreted in terms of solute-cosolute and solute-solvent interactions present in the studied aqueous mixtures.



中文翻译:

N-甲基甘氨酸溶质与(d-葡萄糖+水)二元溶剂三元混合物在298.15、308.15和318.15 K温度下的热物理性质研究

对于混合三元溶液,在d-葡萄糖水溶液中测量了8摩尔浓度的N-甲基甘氨酸浓度,声音速度和折射率数据。的质量摩尔浓度Ñ -methylglycine溶质是0.3140之间和1.2005摩尔公斤· -1在0.2052,0.4201,0.6455和0.8824摩尔公斤· -1水性d-葡萄糖溶剂在298.15、308.15和318.15 K的温度以及大气压下。折射率与密度的实验数据之间的关系与洛伦兹-洛伦茨(Lorentz-Lorenz),戴尔-格拉德斯通(Dale-Gladstone),艾克曼,奥斯特,阿拉戈-比奥,牛顿和莫德-埃克曼等几个经验和半经验方程密切相关。同样,导出的热物理性质包括表观摩尔体积,标准部分摩尔体积,从水到(d-葡萄糖+ H 2的转移)的标准部分摩尔体积O)溶液,等熵可压缩系数,无限稀释下的等熵可压缩性估计值和溶剂化数是根据密度和声速的测量值计算得出的。最后,使用Lorentz-Lorenz方程计算三元混合物中的摩尔折射率。氨基酸和碳水化合物浓度对热物理性质的影响已得到证实。根据研究的含水混合物中存在的溶质-溶质和溶质-溶剂相互作用来解释获得的值。

更新日期:2018-01-07
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