Structure design of double-pore silica and its application to HPLC

被引:101
作者
Nakanishi, K [1 ]
Minakuchi, H
Soga, N
Tanaka, N
机构
[1] Kyoto Univ, Grad Sch Engn, Dept Chem Mat, Sakyo Ku, Kyoto 60601, Japan
[2] Kyoto Inst Technol, Dept Polymer Sci & Engn, Sakyo Ku, Kyoto 606, Japan
关键词
silica gels; phase separation; pore size distribution; liquid chromatography;
D O I
10.1023/A:1008644514849
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Utilizing the concurrence of polymerization-induced phase separation and sol-gel transition in the hydrolytic polycondensation of alkoxysilanes, a well-defined macroporous structure is formed in a monolithic wet gel. By exchanging the fluid phase of the wet gel with an appropriate external solution, the nanometer-range structure of the wet gel can be reorganized into structures with larger median pore size essentially without affecting the macroporous framework. The double-pore structure thus prepared is characterized by open pores distributed in discrete size ranges of micrometers and nanometers. A new type of chromatographic column (silica rod) has been developed using monolithic double-pore silica instead of packed spherical gel particles. Typical silica rod columns had significantly reduced pressure drops and improved analytical efficiencies which do not deteriorate even at higher sample flow rates, both arising from a greater macropore volume than particle packed columns.
引用
收藏
页码:163 / 169
页数:7
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