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Imogolite Synthesis at 25°C

Published online by Cambridge University Press:  02 April 2024

Shin-ichiro Wada
Shin-ichiro Wada*
Affiliation:
Department of Agricultural Chemistry, Kyushu University 46, Fukuoka 812, Japan
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Abstract

Imogolite was synthesized at 25°C by aging partially neutralized solutions containing monomeric silicic acid and polymeric hydroxy-aluminum ions for 7 years. Solutions having an initial Si/Al molar ratio of about 0.5 and pHs of 4.0–4.5 produced the largest yields of imogolite, followed by those having an initial Si/Al ratio of about 1, although imogolite was not the principal product. Electron microscopic examination showed a small amount of imogolite fibers embedded in a noncrystalline gel-like substance. Traces of imogolite were detected in solutions having an initial Si/Al ratio of about 2, but no imogolite was found by electron microscopy in products from solutions having an initial Si/Al ratio of about 4. Only gibbsite formed from solutions having initial Si/Al ratios of <0.27. The diameter of the tubular structural unit of the imogolite produced in these experiments was 23 ± 2Å, close to that of natural imogolite.

Keywords

FiberImogoliteInfrared spectroscopySynthesisTransmission electron microscopy
Type
Research Article
Information
Clays and Clay Minerals , Volume 35 , Issue 5 , October 1987 , pp. 379 - 384
Copyright
Copyright © 1987, The Clay Minerals Society

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