PREPARATION OF ALUMINUM HYDROXIDE GELS BY THE SOL-GEL METHOD

SONG KC; CHUNG IJ

Korean Journal of Chemical Engineering, Vol.7, No.1, 81-84, January, 1990

Aluminum hydroxide gels were prepared by the sol-gel method. The role of acid in sols was investigated through the analysis of gelling time and hydrolysis rate. The phase transformation of gels with calcination temperatures was also monitored with X-Ray diffraction. The gelling times of the aluminum hydroxide sols decreased with the increase of acid content. Exceptionally, the solution peptized with 0.07 HCl/ alkoxide molar ratio look longer time than other solutions until the gellation. The hydrolysis rate of aluminum hydroxide was much faster as the acid concentration increased during peptization. In the case of NH₄OH as a peptizing agent, there was the lower rate of hydrolysis and thus the more alkyl groups were remained in the gel.

[References]

Sakka S, Kamiya K, J. Non-Cryst. Solids, 42, 403 (1980)
Yoldas BE, J. Appl. Chem. Biotech., 23, 803 (1973)
Yoldas BE, Am. Ceram. Soc. Bull., 54, 289 (1975)
Song KC, Ph.D. Dissertation, Korea Advanced Institute of Science & Technology, Seoul, Korea (1989)
Song KC, Chung IJ, J. Non-Cryst. Solids, 107, 193 (1989)
Matthews RB, Tewari PH, Copps TP, J. Colloid Interface Sci., 68, 260 (1979)
Yoldas BE, J. Mater. Sci., 10, 1856 (1975)
Brinker CJ, Keefer KD, Schaefer DW, Ashley CS, J. Non-Cryst. Solids, 48, 47 (1982)
Klein LC, Garrey GJ, J. Non-Cryst. Solids, 38-39, 45 (1980)
Yamane M, Inoue S, Yasumori A, J. Non-Cryst. Solids, 63, 13 (1984)
Kwon SH, Chung SJ, Phys. Chem. Glasses, 28, 28 (1987)
Gadsden JA, "Infrared Spectra of Minerals and Related Inorganic Compounds," Butterworths Reading, Mass. (1975)
Frederickson LD, Anal. Chem., 26, 1883 (1974)
Nakamoto K, "Infrared and Raman Spectra of Inorganic and Coordination Compounds," Wiley, New York (1978)
Song KC, Chung IJ, J. Non-Cryst. Solids, 108, 37 (1989)

[Referenced By]

[1] Sakka S, Kamiya K, J. Non-Cryst. Solids, 42, 403 (1980)

[2] Yoldas BE, J. Appl. Chem. Biotech., 23, 803 (1973)

[3] Yoldas BE, Am. Ceram. Soc. Bull., 54, 289 (1975)

[4] Song KC, Ph.D. Dissertation, Korea Advanced Institute of Science & Technology, Seoul, Korea (1989)

[5] Song KC, Chung IJ, J. Non-Cryst. Solids, 107, 193 (1989)

[6] Matthews RB, Tewari PH, Copps TP, J. Colloid Interface Sci., 68, 260 (1979)

[7] Yoldas BE, J. Mater. Sci., 10, 1856 (1975)

[8] Brinker CJ, Keefer KD, Schaefer DW, Ashley CS, J. Non-Cryst. Solids, 48, 47 (1982)

[9] Klein LC, Garrey GJ, J. Non-Cryst. Solids, 38-39, 45 (1980)

[10] Yamane M, Inoue S, Yasumori A, J. Non-Cryst. Solids, 63, 13 (1984)

[11] Kwon SH, Chung SJ, Phys. Chem. Glasses, 28, 28 (1987)

[12] Gadsden JA, "Infrared Spectra of Minerals and Related Inorganic Compounds," Butterworths Reading, Mass. (1975)

[13] Frederickson LD, Anal. Chem., 26, 1883 (1974)

[14] Nakamoto K, "Infrared and Raman Spectra of Inorganic and Coordination Compounds," Wiley, New York (1978)

[15] Song KC, Chung IJ, J. Non-Cryst. Solids, 108, 37 (1989)