화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korean Journal of Materials Research, Vol.15, No.2, 97-105, February, 2005
DOI10.3740/MRSK.2005.15.2.097  Export Citation
알루미나가 11A Tobermorite의 수열합성에 미치는 영향
Influence of Alumina on Hydrothermal Synthesis of 11A Tobermorite
임굉†, 임재석1
  • 배재대학교 나노고분자재료공학과
  • 1인하대학교 화학공학과
Going Yim†, and Chai Suk Yim1
  • Dept. of Nanopolym. Mater. Eng., Paichai University, Daejon 302-735, Korea
  • 1Dept. of Chem. Eng., Inha University, Incheon 402-751, Korea
E-mail:
[ 11\AA ] tobermorite (5CaO?6SiO 2 ?5H 2 O) is synthesized from the mixtures of calcium hydroride and quartz using alumina in a molar ratio Ca(OH) 2 /SiO 2 of 0.8 at 180 ? C for 8 and 24 hrs under saturated steam pressure. The influence of alumina on the formation of 11\AA tobermorite was investigated by X-ray diffraction, differential thermal analysis and infrared spectroscopy. 11\AA tobermorite containing increasingly larger amounts of aluminum showed a shift of the basal spacing from 11.3 to 11.6\AA . In general, there was a direct linear relation between the basal spacing and added content of alumina. The differential thermal analysis curves showed that 11\AA tobermorite with increasing alumina contents exhibited the exothermic peak at high temperature, namely 11\AA tobermorite containing aluminum gave a sharp exothermic peak at temperature around 850\~860 ? C in the case of S 3 \~S 5 . The absorption band at 1607\~1620cm ?1 is attributed to the bending vibration of water, and the position of the main O-H stretching and Si-O lattice vibration of 11\AA tobermorite at 3500 and 965cm ?1 respectively is not altered. Consequently the existence of alumina accelerates the crystallization of 11\AA tobermorite, and that the aluminum ion appears to substitute for the silicon ion in 11\AA tobermorite structure. Al-containing tobermorite is distinguished from Al-free tobermorite.
Keywords:calcium silicate hydrate;hydrothermal synthesis;alumina;basal spacing
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