THERMODYNAMIC STUDY OF SOLUTE RETENTION ON A SMECTIC LIQUID-CRYSTALLINE PHASE IN SUPERCRITICAL FLUID CHROMATOGRAPHY

被引：9

作者：

LUFFER, DR ^{[1
]}

NOVOTNY, M ^{[1
]}

机构：

[1] INDIANA UNIV,DEPT CHEM,BLOOMINGTON,IN 47405

来源：

JOURNAL OF PHYSICAL CHEMISTRY | 1990年 / 94卷 / 07期

关键词：

D O I：

10.1021/j100370a076

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Capillary supercritical fluid chromatography was used to obtain the values for entropy and enthalpy of solute transfer as a function of density for isomeric polycyclics on a smectic liquid-crystalline stationary phase. The values were compared with those obtained from a structurally similar nonmesomorphic stationary phase. Two different fluids were investigated, and it was determined that carbon dioxide has a greater affinity for both stationary phases, than does nitrous oxide. Retention behavior in the vicinity of the glassy-to-smectic transition was also investigated and found to depend on the mobile-phase density but not on the mobile-phase polarity. The appearance of a plateau at certain densities is explained by a pretransition region. © 1990 American Chemical Society.

引用

页码：3161 / 3166

页数：6

共 48 条

[1] SYNTHESIS AND PROPERTIES OF HIGH-TEMPERATURE MESOMORPHIC POLYSILOXANE SOLVENTS - BIPHENYL-BASED AND TERPHENYL-BASED NEMATIC SYSTEMS [J].