Effect of End-Capping and Surface Coverage on the Mechanism of Solvent Adsorption

被引：23
|
作者：
Bocian, Szymon [1 ]
Vajda, Peter [2 ]
Felinger, Attila [2 ]
Buszewski, Boguslaw [1 ]
机构：
[1] Nicholas Copernicus Univ, Fac Chem, Dept Environm Chem & Bioanal, PL-87100 Torun, Poland
[2] Univ Pecs, Dept Analyt & Environm Chem, H-7624 Pecs, Hungary
来源：
CHROMATOGRAPHIA | 2010年 / 71卷
关键词：
Column liquid chromatography; Excess isotherm; Solvent adsorption; End-capping; Bonded stationary phase; PHASE LIQUID-CHROMATOGRAPHY; CHEMICALLY BONDED PHASES; EXCESS ADSORPTION; STATIONARY PHASES; ORGANIC-SOLVENTS; RETENTION MECHANISM; CHAIN CONFORMATION; ELUENT COMPONENTS; DEAD-VOLUME; ISOTHERMS;
D O I：
10.1365/s10337-010-1522-0
中图分类号：
Q5 [生物化学];
学科分类号：
071010 ; 081704 ;
摘要：
Adsorption of acetonitrile and methanol was measured on non-endcapped and endcapped octadecyl stationary phases. The results enabled us to characterize the effect of end-capping on the adsorption of the organic modifiers. Our results clearly demonstrate how the end-capping groups modify the chromatographic properties of adsorbents. Differences between solvent adsorption mechanisms are also discussed. Adsorption of acetonitrile is governed by hydrophobic effects whereas methanol is adsorbed by the organic ligand by a hydrophobic interaction and by the residual silanols by hydrogen-bond formation and dipole-dipole interactions.
引用
收藏
页码：S5 / S11
页数：7
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