Adsorption, Thermogravimetric, and Chromatographic Studies of Bare Silicas and Silica-Based Octyl Bonded Phases
作者:
T. Czajkowska,
V. Tittelbach,
Y. Bereznitski,
M. Jaroniec,
期刊:
Journal of Liquid Chromatography & Related Technologies
(Taylor Available online 1998)
卷期:
Volume 21,
issue 13
页码: 1957-1977
ISSN:1082-6076
年代: 1998
DOI:10.1080/10826079808006601
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Structural and surface properties of seven chromatographic silica gels were characterized by means of nitrogen adsorption and high-resolution thermogravimetry. The retention of alkyl benzenes was measured using the corresponding commercial octyl-bonded phases. The partition-displacement model was used to evaluate the equilibrium sorption constant and the surface excess of acetonitrile for each octyl phase. Most of the stationary phases studied showed similar sorption properties and, consequently, comparable values of the acetonitrile surface excess. Only for one of the phases studied the surface excess was much higher, and that was attributed to the difference in the silanol coverage of the stationary phase.
点击下载:
PDF (792KB)
返 回