Turkish Journal
of
Chemistry
chem@tubitak.gov.tr
Turkish Journal of Chemistry
Formation of the Monolithic Silica Gel Column with Bimodal Pore Structure1College of Chemistry and Environmental Science, HeBei University,
Baoding 071002, P.R. CHINA
e-mail: ygl@mail.hbu.edu.cn
2College of Biological Science and Engineering, HeBei University of Science and Technology,
Shijiazhuang 050018, P.R. CHINA
3Center for Molecular Science, Institute of Chemistry, Chinese Academy of Science,
Beijing 100080, P.R. CHINA
Abstract: A biporous monolithic silica gel column possessing both micrometer sized through-pores and nanometer sized mesopores located in the silica skeletons was prepared and the high concentration porogen (e.g., 2 mol/L ammonium hydroxide solution) was use for increasing mesopore size in this work. The mechanism for the preparation of the monolithic column was investigated in detail. Moreover, the effect of the polyethylene glycol concentration in the starting solution was studied and it was found that a lower concentration range was also suitable for forming the interconnected porous structure for the monolithic silica gel column. At lower concentrations, however, the phase separation mechanisms and experimental results were different.
Key Words: Monolithic silica gel column, Phase separation, Sol-gel transition, Pore structure
Turk. J. Chem., 28, (2004), 379-386.
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Other articles published in the same issue: Turk. J. Chem.,vol.28,iss.3.