Université Libre de Bruxelles, Brussels, Belgium.
J Chem Phys. 2013 Apr 28;138(16):161102. doi: 10.1063/1.4802987.
A new approach is proposed to cross-check conflicting measured values of the thermodiffusion coefficients in ternary mixtures. The results of recent measurements performed in ternary mixture of hydrocarbons 1,2,3,4-tetrahydronaphthalene, isobutylbenzene, and dodecane by thermogravitational column [P. Blanco, M. M. Bou-Ali, J. K. Platten, D. A. de Mezquia, J. A. Madariaga, and C. Santamaría, J. Chem. Phys. 132, 114506 (2010)] and optical beam deflection [A. Königer, H. Wunderlich, and W. Köhler, J. Chem. Phys. 132, 174506 (2010)] are critically analyzed. A way of matching them into a unique value is reported. The accuracy of the integrated value should significantly exceed that of the original results. Two diagnostics are required to determine thermodiffusion coefficients in ternary mixture, e.g., two different wavelengths or density and refractive index. It is shown that by attributing a reliability weight for each pair of diagnostics among the available techniques the best combination can be selected. The true values of thermodiffusion coefficients are extremely sensitive to the knowledge of precise values of mass diffusion coefficients and contrast factors.
提出了一种新方法来交叉检查三元混合物中热扩散系数的冲突测量值。通过热重力柱[P. Blanco、M. M. Bou-Ali、J. K. Platten、D. A. de Mezquia、J. A. Madariaga 和 C. Santamaría，J. Chem. Phys. 132, 114506（2010）]和光偏转[A. Königer、H. Wunderlich 和 W. Köhler，J. Chem. Phys. 132, 174506（2010）]在烃 1,2,3,4-四氢萘、异丁基苯和十二烷的三元混合物中进行的最新测量结果进行了批判性分析。报告了将它们匹配成一个独特值的方法。综合值的准确性应该大大超过原始结果。需要两种诊断方法来确定三元混合物中的热扩散系数，例如，两种不同的波长或密度和折射率。结果表明，通过为可用技术中的每对诊断分配可靠性权重，可以选择最佳组合。热扩散系数的真实值对质量扩散系数和对比因子的精确值的知识极为敏感。
