Synthesis and characterization of endcapped C18 stationary phases using a silica hydride intermediate.
Synthesis and characterization of endcapped C18 stationary phases using a silica hydride intermediate.
复制标题
使用二氧化硅中间体合成和表征封端 C18 固定相。
DOI：
10.1016/s0021-9673(02)00014-6
复制
发表时间：
2002
期刊：
影响因子：
--
通讯作者：
Yu,RaymondJ
中科院分区：
文献类型：
--
作者：
Pesek,JosephJ;Matyska,MariaT;Yu,RaymondJ
The effect of endcapping on an octdecyl bonded phase synthesized by the silanization/hydrosilation method is investigated. The endcapping reagent is a 1:1 molar ratio of trimethylchlorosilane (TMCS) and hexamethyldisilizane (HMDS). Two approaches for endcapping are possible for this synthetic method that produces a silica hydride intermediate: bonding of TMCS–HMDS after silanization (on the hydride intermediate) or after hydrosilation (on the C18product stationary phase). The use of TMCS–HMDS is designed to eliminate the few remaining silanols on the silica hydride intermediate. The endcapping process is characterized spectroscopically by diffuse reflectance infrared Fourier transform (DRIFT),29Si cross polarization magic angle spinning nuclear magnetic resonance spectroscopy (CP-MAS-NMR) and13C-CP-MAS-NMR. The octadecyl bonded phases are characterized chromatographically by measuring the capacity factors of several hydrophobic and basic test solutes as well as the separation factors among various solute pairs. Finally, long-term stability tests are done on both products at high and low pH.
登录
查看更多内容
用于 HPLC、HPCE 和电色谱的氢化物基表面材料
影响因子：
7.4
作者：
J. Pesek
通讯作者：
J. Pesek
影响因子：
6.2
作者：
C. Lochmüller;D. Marshall
通讯作者：
D. Marshall
用于 OTCEC 和 CE 的壁改性二氧化硅毛细管的表征
影响因子：
1.3
作者：
M. Matyska;J. Pesek;E. Sandoval;Urmi Parkar;Xiaoli Liu
通讯作者：
Xiaoli Liu
影响因子：
7.4
作者：
CHU, CH;JONSSON, E;SANDOVAL, JE
通讯作者：
SANDOVAL, JE
影响因子：
4.1
作者：
CHIARI, M;NESI, M;PESEK, JJ
通讯作者：
PESEK, JJ