The role of water in opal
作者:
E. R. Segnit,
T. J. Stevens,
J. B. Jones,
期刊:
Journal of the Geological Society of Australia
(Taylor Available online 1965)
卷期:
Volume 12,
issue 2
页码: 211-226
ISSN:0016-7614
年代: 1965
DOI:10.1080/00167616508728593
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The occurrence of water in natural opaline silicas has been studied by differential thermal analysis, thermogravimetric analysis, infra‐red analysis and nuclear magnetic resonance. The results show that in the “crystalline” opals studied, some 90 per cent or more of the total water is physically adsorbed whereas in “amorphous” opals, at least 20 per cent but perhaps much more of the total water is held as hydroxyl groups chemically bonded to the silica surface. The rate of water loss on heating is also different, being chiefly controlled by the pore structure in “crystalline” opals but to a significant extent by the surface structure in “amorphous”.
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