| Author Name | Affiliation | | WANG Li-jiu | Institute of Building Materials,School of Civil and Hydraulic Engineering,Dalian University of Technology,Dalian 116024,China | | XuHaiXun | Institute of Building Materials,School of Civil and Hydraulic Engineering,Dalian University of Technology,Dalian 116024,China | | ZHAO Shan-yu | Institute of Building Materials,School of Civil and Hydraulic Engineering,Dalian University of Technology,Dalian 116024,China |
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| Abstract: |
| The effect of drying techniques on the microstructure,morphology and pore structure of porous silica gels was studied in the paper.The gels were prepared by using sol-gel process and different drying routes:freeze-drying (FD),low pressure drying (LPD),high temperature drying (HTD) and chemical modification & ambient drying (CMD) techniques.Observation under pore distribution and structural properties showed that CMD technique leads to homogenous mesoporous silica material with specific surface area of 745 m2/g,and the average pore size around 20 nm,while LPD and HTD result in loosely packed particles with non-isotropic aggregation pattern.The specific surface areas of LPD and HTD samples are 419 and 513 m2/g respectively,and the pore size distribution of the samples are observed distributing widely in range of 10-100 nm.Freeze drying method is a new but prospective way to prepare mesoporous silica.The specific area of FD sample is around 500 m2/g.By the comparison for the properties of the gels,this paper wants to induce a further interest in finding a proper method to synthesize the porous silica gels for low price use. |
| Key words: sol-gel porous silica materials drying techniques N2 gas adsorption pore structure |
| DOI：10.11916/j.issn.1005-9113.2011.04.015 |
| Clc Number:TU58 |
| Fund: |
