NDLI: Pore size control of silica gels in basic water conditions using sol-gel processing

Content Provider	IEEE Xplore Digital Library
Author	Geun Chang Hoang Hyun Soon Lee
Copyright Year	1997
Description	Author affiliation: Div. of Phys., Wonkwang Univ., Iksan, South Korea (Geun Chang Hoang)
Abstract	Pore size of silica gels can be affected by the molar ratio between TMOS and water and by pH solution due to hydrolysis reaction. The molar ratio of TMOS: Methanol: Water was 1:7.5: 22.5. For hydrolysis reaction, basic water of pH 8.5, pH 10.2, and pH 11.2 were used. After making gels with these solutions, the pore sizes of gels turned out to be 37 /spl Aring/, 43 /spl Aring/, and 49 /spl Aring/, respectively. The pore size was increased with higher pH. However, gels made by the same method above were washed 3 times during 36 hours with various pHs of water; pH 1, pH 5, pH 10.5, and pH 12.5. The pore size of washed gels were increased with increase in pH value. Significantly, with pH 12.5, the pore of washed gels were enlarged about 2.2 times compared with unwashed gels. Thus, this washing technique can be used for controlling pore size of silica gels.
Starting Page	174
Ending Page	177
File Size	323245
Page Count	4
File Format	PDF
ISBN	0780326512
DOI	10.1109/ICPADM.1997.617556
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1997-05-25
Publisher Place	South Korea
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Size control Silicon compounds Methanol Glass Size measurement Ovens Physics Optical materials Optical fibers Solvents
Content Type	Text
Resource Type	Article

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