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Interstratification in Expandable Mica Produced by Cation-Exchange Treatment

Published online by Cambridge University Press:  28 February 2024

Hiroshi Tateyama ,
Hiroaki Noma ,
Satoshi Nishimura ,
Yoshio Adachi ,
Masaru Ooi  and
Kazuo Urabe
Hiroshi Tateyama
Affiliation:
Kyushu National Industrial Research Institute, Shuku-machi, Tosu city, Saga Prefecture, 841 Japan
Hiroaki Noma
Affiliation:
Kyushu National Industrial Research Institute, Shuku-machi, Tosu city, Saga Prefecture, 841 Japan
Satoshi Nishimura
Affiliation:
Kyushu National Industrial Research Institute, Shuku-machi, Tosu city, Saga Prefecture, 841 Japan
Yoshio Adachi
Affiliation:
Kyushu National Industrial Research Institute, Shuku-machi, Tosu city, Saga Prefecture, 841 Japan
Masaru Ooi
Affiliation:
CO-OP Chemicals Co. Ltd, 1-23-3, Chiyoda-ku, Tokyo, 102, Japan
Kazuo Urabe
Affiliation:
Department of Applied Chemistry, School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464, Japan
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Abstract

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A unique interstratified expandable mica was obtained by cation exchange treatments using an expandable mica synthesized from talc. The 23Na magic angle spinning (MAS) nuclear magnetic resonance (NMR) spectrum of the expandable mica used as a starting material showed that it had 2 kinds of Na+: one was exchangeable and the other was not exchangeable. Half of the Na+ per unit cell of the expandable mica was replaced with Mg2+ by cation exchange treatments. The X-ray powder diffraction (XRD) analysis of the Mg2+-exchanged expandable mica, after heating at 73°C, indicated that Na+ in the interlayer sheets was exchanged with Mg2+ in every second layer and that it had an interstratified structure with a 12.5-Å layer thickness and a 9.6-Å layer thickness. The structure of the Mg2+-exchanged expandable mica was changed into a unique interstratified structure by the calcination at 600°C; one component had a stacking sequence of talc and a small amount of OH−, but the other had a different stacking sequence from talc and no structural OH—.

Keywords

1H MAS NMR Spectra23Na29SiCation ExchangeInterstratificationMigration
Type
Research Article
Information
Clays and Clay Minerals , Volume 46 , Issue 3 , June 1998 , pp. 245 - 255
Copyright
Copyright © 1998, The Clay Minerals Society

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