Electron spin resonance studies under dynamic mobile phase conditions on chemically modified silica.
Electron spin resonance studies under dynamic mobile phase conditions on chemically modified silica.
复制标题
化学改性二氧化硅动态流动相条件下的电子自旋共振研究。
DOI:
10.1016/s0021-9673(00)90569-7
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发表时间:
1988
期刊:
影响因子:
--
通讯作者:
Gorse,J
中科院分区:
文献类型:
--
作者:
Miller,C;Dadoo,R;Kooser,RG;Gorse,J
The electron-spin resonance (ESR) techniques of spin labeling and probing are shown to be powerful methods for the study of bonded silicas used in chromatographic separations under dynamic solvent flow conditions. Microscopic information gained from these studies includes solvation composition of the bonded phase at various locales in the bonded phase, configuration of the bonded phase and solvent-flow effects. In the spin-label study,2-(2,2-dimethyloxazolidine-N-oxy)hexylsilane (DOXYL hexyl siloxane) was used as the label. ESR spectra show changes in the motional freedom of the bonded surface as a function of mobile phase composition and elution time and demonstrate chain stiffening with the introduction of water, as infered by other studies. In the spin-probe work, various nitroxide compounds of the 2,2,6,6-tetramethyl-l-piperidinyloxyl (TEMPO) family were introduced under flow conditions as a O.1 mMsolution in various water—methanol mobile phases. C18sample columns were equilibrated with this mixture. Interpretation of the spectra yielded information about the solvated environment on the surface that was sampled by the probes as a function of both the mobile phase and the polarity of the probe.
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影响因子:
7.4
作者:
R. Gilpin;A. Kasturi;E. Gelerinter
通讯作者:
E. Gelerinter
DOI:
--
发表时间:
1972
期刊:
影响因子:
--
作者:
S. Goldman;G. V. Bruno;C. Polnaszek;J. Freed
通讯作者:
J. Freed
DOI:
10.1021/j100339a090
发表时间:
1988
期刊:
The Journal of Physical Chemistry
影响因子:
--
作者:
J. Hwang;W. A. Al;M. Saleem
通讯作者:
M. Saleem
DOI:
10.1016/0021-9797(83)90040-1
发表时间:
1983
期刊:
The Journal of Physical Chemistry
影响因子:
--
作者:
M. Romanelli;M. Ottaviani;G. Martini
通讯作者:
G. Martini
影响因子:
4.1
作者:
R. Scott;C. Simpson
通讯作者:
C. Simpson