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Synthesis and characterization of a hollow spherical form of monolayer aluminosilicate

Koji Wada, Michael Wilson, Yasuko Kakuto and Shin-Ichiro Wada
Synthesis and characterization of a hollow spherical form of monolayer aluminosilicate
Clays and Clay Minerals (February 1988) 36 (1): 11-18

Abstract

Hollow spherical particles of aluminosilicate having diameters of 80 to 100 Aa 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 degrees -100 degrees 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 (Si (sub 1.85) Al (sub 0.62) ) (super IV) (A (sub 1.38) ) (super VI) (OH) (sub 4.10) O (sub 4.96) Na (sub 0.62) , compared with (Si (sub 2) ) (super IV) (Al (sub 2) ) (super VI) (OH) (sub 4) O (sub 5) for an ideal 1:1 layer silicate. High-resolution (super 29) Si and (super 27) Al nuclear magnetic resonance spectroscopy indicated the substitution of Al for Si in the tetrahedral sheet, the presence of Al (super IV) and Al (super VI) , 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.


ISSN: 0009-8604
Coden: CLCMAB
Serial Title: Clays and Clay Minerals
Serial Volume: 36
Serial Issue: 1
Title: Synthesis and characterization of a hollow spherical form of monolayer aluminosilicate
Affiliation: Kyushu Univ., Fac. Agric., Fukuoka, Japan
Pages: 11-18
Published: 198802
Text Language: English
Summary Language: Japanese
Publisher: Clay Minerals Society, Clarkson, NY, United States
References: 24
Accession Number: 1988-025760
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table
Secondary Affiliation: CSIRO, AUS, Australia
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland
Update Code: 1988
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