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Synthesis and Characterization of a Hollow Spherical Form of Monolayer Aluminosilicate

Published online by Cambridge University Press:  02 April 2024

Koji Wada ,
Michael Wilson ,
Yasuko Kakuto  and
Shin-Ichiro Wada
Koji Wada
Affiliation:
Faculty of Agriculture, Kyushu University 46, Fukuoka 812, Japan
Michael Wilson
Affiliation:
Division of Fossil Fuels, CSIRO, Delhi Road, North Ryde, New South Wales 2113, Australia
Yasuko Kakuto
Affiliation:
Faculty of Agriculture, Kyushu University 46, Fukuoka 812, Japan
Shin-Ichiro Wada
Affiliation:
Faculty of Agriculture, Kyushu University 46, Fukuoka 812, Japan
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Abstract

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Hollow spherical particles of aluminosilicate having diameters of 80 to 100 Å and high electric charge were synthesized by heating solutions containing Si and Al concentrations of about 2 mM (Si/Al molar ratio = 1.0–1.2; pH = 9.0) at 95°–100°C for 7 days. Electron microscopy, X-ray powder diffraction, and infrared spectroscopy suggested that the walls of the spherical particles consisted of monolayer aluminosilicate, most probably having a 1:1 layer structure. Chemical analysis supported this supposition but indicated modifications as shown in the formula (Si1.85Alo0.62)IV(Al1.38)VI(OH)4.10O4.96Na0.62, compared with (Si2)lv(Al2)VI(OH)4O5 for an ideal 1:1 layer silicate. High-resolution 29Si and 27A1 nuclear magnetic resonance spectroscopy indicated the substitution of Al for Si in the tetrahedral sheet, the presence of A1IV and A1VI, and the presence of Si bonded through oxygen to three Al atoms and one H. A natural counterpart of the synthesized aluminosilicate may be a precursor of halloysites formed by weathering of volcanic ash and pumice and have a close structural relation with allophane and imogolite

Keywords

AllophaneAluminosilicateHalloysiteImogoliteInfrared spectroscopyNuclear magnetic resonanceSynthesisTransmission electron microscopy
Type
Research Article
Information
Clays and Clay Minerals , Volume 36 , Issue 1 , February 1988 , pp. 11 - 18
Copyright
Copyright © 1988, The Clay Minerals Society

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