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Design and preparation of hybrid ferroelectric material through ethyleneglycol covalently grafted to Kaolinite

Abstract

Kaolinite, with a chemical formula of Al2Si2O5(OH)4, is an abundant and broadly available layered clay mineral. The aluminosilicate monolayer of Kaolinite is composed of [SiO]6 macrorings on one side and the gibbsite aluminol groups [Al(OH)3] on the other side. In this study, the ethyleneglycol (EG) molecules were covalently grafted to the inner surfaces of Kaolinite by the etherification between the EG hydroxyls and the gibbsite aluminol groups to give the hybrid material of covalently grafting Kaolinite (denoted as K-EG-cg). Commonly, it takes longer time (ca. 16 hours) using the conventionally heating and stirring method for the preparation of K-EG-cg, however, it only needs ca. 6 hours to achieve K-EG-cg using the solvothermal reaction, moreover, its intercalating efficiency or ratio of the product is comparable to that using the conventionally heating and stirring method. The infrared spectra, thermogravimetric (TG) analysis and powder x-ray diffraction were performed, and these measurements clearly demonstrated that K-EG-cg is the covalently grafted product, not the sample of physical intercalation of Kaolinite with EG (abbr. K-EG). Moreover, the hybrid material of K-EG-cg shows much higher deintercalation temperature regarding K-EG. The dielectrics was investigated for K-EG-cg, indicating that this hybrid material shows intrinsic ferroelectric nature, with the spontaneous polarization PS ≈ 0.018 μC/cm2, the remanent polarization Pr ≈ 0.015 μC/cm2 and the coercive field EC ≈ 1.045 kV/cm at room temperature. This study gives a fresh impetus to achieve the Kaolinite-based hybrid functional material via covalently grafting approach, which could overcome the disadvantage of intercalating Kaolinite being thermally unstable.

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Publication details

The article was received on 15 Jun 2017, accepted on 09 Jul 2017 and first published on 10 Jul 2017


Article type: Research Article
DOI: 10.1039/C7QI00341B
Citation: Inorg. Chem. Front., 2017, Accepted Manuscript
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    Design and preparation of hybrid ferroelectric material through ethyleneglycol covalently grafted to Kaolinite

    Q. Qiao, Y. Ding, S. Zhao, L. Li, J. Liu and X. Ren, Inorg. Chem. Front., 2017, Accepted Manuscript , DOI: 10.1039/C7QI00341B

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