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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Solution Properties of C_60 and C_70 Fullerenes and C_21 to C_40 n-Alkanes at Infinite Dilution in Carbon Dioxide from Supercritical Fluid Chromatography
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Solution Properties of C_60 and C_70 Fullerenes and C_21 to C_40 n-Alkanes at Infinite Dilution in Carbon Dioxide from Supercritical Fluid Chromatography

机译：超临界流体色谱法在二氧化碳中无限稀释时，C_60和C_70富勒烯和C_21至C_40正构烷烃的溶液性质

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摘要

Retention factors of eleven heavy n-alkanes (C_21H_44, C_22H_46, C_23H_48, C_24H_50, C_25H_52, C_27H_56, C_28H_58, C_31H_64, C_34H_70, C_36Ho_74, and C_40H_82) and C_60 and C_70 fullerenes were measured within 311-431 K and 8.7-39 MPa by supercritical fluid chromatography in an open tubular capillary column. This data set was obtained using a poly(methyl-n-octyl siloxane) stationary polymer and carbon dioxide as the mobile-phase fluid. The retention factors are empolyed to derive the partial molar volumes of the solutes at infinite dilution in CO_2 and the infinite-dilution molar enthalpies of transfer of the solutes from the stationary phase to supercritical CO_2. The partial molar volumes are subsequently transformed to quantities characterizing short-range solute-CO_2 interactions, and the effects are shown of the corrections for dissolution of CO_2 in the stationary polymer on these quantities. Distinct differences between the n-alkane -CO_2 and the fullerence-CO_2 interactions have been found and discussed. Overall, the resultant partial molar properties suggest that the fullerene-CO_2 interactions are less attractive than the n-alkane-CO_2 interactions.
机译：11个重正构烷烃（C_21H_44，C_22H_46，C_23H_48，C_24H_50，C_25H_52，C_27H_56，C_28H_58，C_31H_64，C_34H_70，C_36Ho_74和C_40H_82的保留系数分别在1-4和31范围内，在C_60和31上测得的C_ene值分别在1-4和31内在开放式毛细管毛细管柱中进行超临界流体色谱分析。该数据集是使用聚（甲基-正辛基硅氧烷）固定聚合物和二氧化碳作为流动相流体而获得的。充分利用保留因子，可以推导出在CO_2中无限稀释的溶质的部分摩尔体积，以及溶质从固定相到超临界CO_2的无限稀释摩尔焓。随后将部分摩尔体积转化为表征短程溶质-CO_2相互作用的量，并显示了针对这些量的固定聚合物中CO_2溶解校正的影响。已经发现并讨论了正构烷烃-CO_2和富勒烯-CO_2相互作用之间的明显差异。总体而言，所得的部分摩尔性质表明，富勒烯-CO_2相互作用不如正构烷烃-CO_2相互作用具有吸引力。

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