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Regioselective Approach to Characterizing Increased Edge Availability in Layered Crystal Materials following Layer Expansion: Reaction of Kaolinite with Octadecyltrimethylammonium Salts

Department of Material Science and Technology, Faculty of Advanced Engineering, Tokyo University of Science, 6-3-1 Niijuku, Katsushika-ku, Tokyo 125-8585, Japan
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Academic Editors: Evgeny V. Nazarchuk and Antonio Polimeni
Materials 2022, 15(2), 588; https://doi.org/10.3390/ma15020588
Received: 16 November 2021 / Revised: 31 December 2021 / Accepted: 10 January 2022 / Published: 13 January 2022
(This article belongs to the Special Issue Layered Crystal Materials: Design, Synthesis and Characterisation)
In this paper, the regioselective reactions of kaolinite and methoxy-modified kaolinite (MeO-Kaol), methanol-expanded kaolinite, with octadecyltrimethylammonium salts are compared. This study mainly concerns the reactions of kaolinite or MeO-Kaol with octadecyltrimethylammonium chloride (C18TAC) in methanol and the subsequent exhaustive washing of the resultant products with ethanol. X-ray diffraction patterns of the products reveal no intercalation of C18TAC between pristine kaolinite layers. Additionally, intercalation and subsequent deintercalation of C18TAC proceed in the product using MeO-Kaol. In the Fourier-transform infrared spectra, the intensities of CH2 stretching bands of the product prepared using MeO-Kaol drastically increase compared to those using kaolinite. In addition, CH2 stretching bands of the product using kaolinite are hardly observed without enlarging the spectrum. The product using MeO-Kaol also displays mass loss in the range of 200–300 °C in the thermogravimetric curve and a nitrogen content with 0.15 mass% estimated using the CHN analysis. These results therefore demonstrate an increase in the available reactive edges in the layered crystal material following an expansion of the stacked layers. View Full-Text
Keywords: kaolinite; edge modification; alkylammonium ion; organically-modified kaolinite; intercalation kaolinite; edge modification; alkylammonium ion; organically-modified kaolinite; intercalation
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MDPI and ACS Style

Machida, S.; Katsumata, K.-i.; Yasumori, A. Regioselective Approach to Characterizing Increased Edge Availability in Layered Crystal Materials following Layer Expansion: Reaction of Kaolinite with Octadecyltrimethylammonium Salts. Materials 2022, 15, 588. https://doi.org/10.3390/ma15020588

AMA Style

Machida S, Katsumata K-i, Yasumori A. Regioselective Approach to Characterizing Increased Edge Availability in Layered Crystal Materials following Layer Expansion: Reaction of Kaolinite with Octadecyltrimethylammonium Salts. Materials. 2022; 15(2):588. https://doi.org/10.3390/ma15020588

Chicago/Turabian Style

Machida, Shingo, Ken-ichi Katsumata, and Atsuo Yasumori. 2022. "Regioselective Approach to Characterizing Increased Edge Availability in Layered Crystal Materials following Layer Expansion: Reaction of Kaolinite with Octadecyltrimethylammonium Salts" Materials 15, no. 2: 588. https://doi.org/10.3390/ma15020588

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