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Crystal growth of layered silicate grafted with organic groups on monodisperse spherical silica particles

Masahiro Yamauchi and Tomohiko Okada
Crystal growth of layered silicate grafted with organic groups on monodisperse spherical silica particles
Clays and Clay Minerals (April 2018) 66 (2): 104-113

Abstract

Control of the structure and morphology of clay crystals presents a challenge in the synthesis of materials for adsorption and catalysis. In the present study, direct crystallization of a phyllosilicate grafted with organosilyl (methylsilyl and phenylsilyl) groups on the surface of monodisperse spherical silica particles (2.6 mu m) is reported. Methyl- and phenyltriethoxysilanes were allowed to react hydrothermally in a Teflon-lined autoclave with silica, MgCl (sub 2) , and LiF in the presence of urea for 2 or 4 days. X-ray diffraction patterns revealed that the fine platy particles formed were a trioctahedral hectorite-like layered silicate. Greater temperature (150 degrees C) was required to achieve homogeneous coverage of the original spherical silica particles with the hectorite-like particles. The diameter of the initial silica grains increased slightly to 3.0 mu m after the hydrothermal reactions, while the original spherical shape and size distribution were maintained. Solid-state (super 29) Si nuclear magnetic resonance analyses confirmed that the presence of resonances attributed to the RSi(OMg)(OSi) (sub 2) and RSi(OMg)(OH)(OSi) (R = methyl or phenyl) environments of the silicon proved the formation of covalent bonds between phyllosilicate sheets and the organic moieties. The crystallinity of the layered silicates increased when the reactions ran for a longer time (4 days).


ISSN: 0009-8604
EISSN: 1552-8367
Coden: CLCMAB
Serial Title: Clays and Clay Minerals
Serial Volume: 66
Serial Issue: 2
Title: Crystal growth of layered silicate grafted with organic groups on monodisperse spherical silica particles
Affiliation: Shinshu University, Department of Chemistry and Materials Engineering, Nagano, Japan
Pages: 104-113
Published: 201804
Text Language: English
Publisher: Clay Minerals Society, Chantilly, VA, United States
References: 51
Accession Number: 2018-080089
Categories: Geochemistry of rocks, soils, and sedimentsIgneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Abstract, Copyright, Clay Minerals Society. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201844
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