Preparation of Alumina by the Sol-Gel Process(I) - Characteristics of Polymeric Alumina Sol

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J. Korean Ceram. Soc. > Volume 28(1); 1991 > Article

Journal of the Korean Ceramic Society 1991;28(1): 60.

졸겔법에 의한 알루미나의 제조(I) - 중합 알루미나 졸의 특성

이해욱, 김구대¹, 정형진¹, 김창은

연세대학교 요업공학과
¹한국과학기술연구원 세라믹스부

Preparation of Alumina by the Sol-Gel Process(I) - Characteristics of Polymeric Alumina Sol

ABSTRACT

The polymeric alumina sol was prepared by partial hydrolysis of aluminum sec-butoxide reacted with acetylacetone and its characteristics was investigated. The effects of alcohol solvent, acetylacetone, and acid concentration to the sol were investigated. FT-IR and Al27-MASNMR were used to study hydrolysis and polymerization reaction of aluminum complex. Synthesized sol showed the characteristics of polymeric alumina sol. To make a clear polymeric alumina sol, the optimum contents of acetylacetone, H2O and alcohol solvent were 0.4-0.6 mole, 0.25-1.25 mole, 3-5 mole per one mole alkoxide respectively. As a result of the Al27-MASNMR analysis, it was noted that hexa-penta-coordinated Al were main structure.