INFRARED SPECTROSCOPY AS THE METHOD FOR DETERMINING STRUCTURAL RESPONSES OF NATURAL CLAYS TO MICROWAVE EXPOSURE

Keywords: infrared spectroscopy, absorption band, montmorillonite, kaolinite, phyllosilicates, microwave exposure, chemical bonds.

Abstract

Purpose. Universal applicability of naturally occurring materials such as clays attracts attention for scientifi c studies of their properties. In this paper microwave induced response of clay particles sourced in Orenburg region is studied. Infrared spectrometry method was used to control structural-morphological transformation induced by microwave field treatment in naturally occurring phyllosilicates. Properties of layered alumosilicates sourced from different deposits differ significantly from the standard samples. The goal of this paper is to study interatomic bounds evolution induced by microwave field treatment and to identify spectral modes in naturally occurring clays that contain montmorillonite and kaolinite with similar chemical composition, but different phase structures.
Methods and methodology. Clays containing more than 50 % of montmorillonite and kaolinite were treated by 750 W microwave fi eld for 10 minutes in two regimes. Chemical bound evolution was evaluated via infrared spectrometry of KBr samples pressed into pill form, measurements were performed with infrared Fourier spectrometer.
Results and conclusions. Infrared spectra of montmorillonite containing clay samples indicate existence of microwave induced structure changes. The spectral peak related with valence symmetric vibrations vanishes. Deformation unbridged bound Al–O–H (line 912 cm–1) vanishes after microwave treatment in dry air environment and reappears in a humid environment as Si–O–Si bound (line 1009 cm–1). Intensity of absorption lines related to valence vibration of Si–O–Si bound in SiO4 tetrahedron (797 сm–1) and deformation vibrations of Si–O bounds in SiO4 tetrahedron (533, 467, 428) are reduced by factors 1.5 and 1.8 correspondingly after microwave treatment in air and humid environments.
Infrared spectra of kaolinite clays contain absorption lines, cm–1: 3620. 3424, 1032, 1008, and 912. Microwave treatment destroy the most part of bounds: in air environment their content is reduced by factor 1.8–2; in a humid environment by factor 2.5. Mainly dominate bounds in SiO4 tetrahedra and bounds d(Al–O–H) are destroyed. Kaolinite clay is more susceptible to microwave treatment.

 

 

SOURCE OF FINANCING
This work was supported by the RFBR grant No. 19-43-560001 r_a “Physico-chemical principles of microwave
consolidation processes of kaolin clays from the Orenburg region as the electroporcelain basis”.

 

 

  

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Author Biographies

Anna G. Chetverikova, Orenburg State University 13, Pobedy ave., 460018 Orenburg, Russian Federation

Cand. Sci. (Phys.- Math.), Associate Professor, Dean of the Physics Department, Orenburg State University, Orenburg, Russian Federation; e-mail: kr-727@mail.ru. ORCID iD 0000-0002-7045-3588.

Olga N. Kanygina, Orenburg State University 13, Pobedy ave., 460018 Orenburg, Russian Federation

Dr. Sci. (Phys.-Math.), Professor, Professor of the Department of Physics and Physics Teaching Methodology, Orenburg State University, Orenburg, Russian Federation; e-mail: onkan@mail.ru. ORCID iD 0000-0001-6501-900X.

Gulzhazira Zh. Alpysbaeva, Orenburg State University 13, Pobedy ave., 460018 Orenburg, Russian Federation

4th year student of the Department of Chemistry, Faculty of Chemistry and Biology, Orenburg State University, Orenburg, Russian Federation; e-mail: qwertysimpleplan@mail.ru. ORCID iD 0000-0001-6066-9679

Alexander A. Yudin, Orenburg State University 13, Pobedy ave., 460018 Orenburg, Russian Federation

4th year student of the Department of Chemistry, Orenburg State University, Orenburg, Russian Federation; e-mail: yudin-s97@yandex.ru. ORCID iD 0000-0003-2424-0781.

Saniya S. Sokabayeva, Orenburg State University 13, Pobedy ave., 460018 Orenburg, Russian Federation

Leading Engineer of the Department of Biophysics and Condensed Matter Physics, Orenburg State University,
Orenburg, Russian Federation; e-mail: sania.sokabaeva@gmail.com. ORCID iD 0000-0003-0619-4363.

Published
2019-09-26
How to Cite
Chetverikova, A. G., Kanygina, O. N., Alpysbaeva, G. Z., Yudin, A. A., & Sokabayeva, S. S. (2019). INFRARED SPECTROSCOPY AS THE METHOD FOR DETERMINING STRUCTURAL RESPONSES OF NATURAL CLAYS TO MICROWAVE EXPOSURE. Kondensirovannye Sredy I Mezhfaznye Granitsy = Condensed Matter and Interphases, 21(3), 446-454. https://doi.org/10.17308/kcmf.2019.21/1155
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Статьи