Cargando…
Structural and Thermal Properties of Montmorillonite/Ionic Liquid Composites
Composites of montmorillonite K10 (MMT K10) and ionic liquid (IL) containing a 1-butyl-3-methyl-imidazolium cation ([BMIm](+)) and various anions, such as bis (trifluoromethylsulfonyl) imide ([NTf(2)](−)), trifluoromethanesulfonate ([OTf](−)), and dicyanamide ([DCA](−)) have been obtained in this wo...
Autores principales: | , , , , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2019
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6721065/ https://www.ncbi.nlm.nih.gov/pubmed/31412560 http://dx.doi.org/10.3390/ma12162578 |
_version_ | 1783448263092862976 |
---|---|
author | Alekseeva, Olga Noskov, Andrew Grishina, Elena Ramenskaya, Lyudmila Kudryakova, Nadezhda Ivanov, Vladimir Agafonov, Alexander |
author_facet | Alekseeva, Olga Noskov, Andrew Grishina, Elena Ramenskaya, Lyudmila Kudryakova, Nadezhda Ivanov, Vladimir Agafonov, Alexander |
author_sort | Alekseeva, Olga |
collection | PubMed |
description | Composites of montmorillonite K10 (MMT K10) and ionic liquid (IL) containing a 1-butyl-3-methyl-imidazolium cation ([BMIm](+)) and various anions, such as bis (trifluoromethylsulfonyl) imide ([NTf(2)](−)), trifluoromethanesulfonate ([OTf](−)), and dicyanamide ([DCA](−)) have been obtained in this work. A number of methods, such as dynamic light scattering (DLS), scanning electron microscopy (SEM), X-ray diffraction (XRD), thermal gravimetry (TG), differential scanning calorimetry (DSC), Fourier-transform infrared (FTIR) spectroscopy, and nitrogen adsorption–desorption have been used to characterize clay, and to study the structure and thermal behaviour of the composites. It has been found that the MMT K10 powder has a narrow particle size distribution with a peak at 246 nm and a mesoporous structure (S(BET)=195 m(2)/g). According to the FTIR spectra, MMT K10/IL interaction depends on the IL type. It has been identified that confined ionic liquid interacts with both clay and adsorbed water in accordance with the hydrophilicity and size of the anion, in the following order: [DCA](−) > [OTf](−) > [NTf(2)](−). Characteristic temperatures of glass transition, crystallization, and melting have been determined for the ionic liquids under study and their MMT K10 composites. It has been revealed that when IL is adsorbed on the surface of clay, the phase transitions in IL change. The greatest changes are observed in the case of BMImNTf(2). By applying the method of thermogravimetric analysis, it is shown that composite formation is accompanied by a decrease in the IL thermal stability. Apparently, the highly developed surface of montmorillonite K10, obtained by acid treatment, plays a major role in the decrease in the IL’s thermal stability. The influence of the IL anion on the thermal and spectral characteristics of an MMT K10/IL composite was studied for the first time. |
format | Online Article Text |
id | pubmed-6721065 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-67210652019-09-10 Structural and Thermal Properties of Montmorillonite/Ionic Liquid Composites Alekseeva, Olga Noskov, Andrew Grishina, Elena Ramenskaya, Lyudmila Kudryakova, Nadezhda Ivanov, Vladimir Agafonov, Alexander Materials (Basel) Article Composites of montmorillonite K10 (MMT K10) and ionic liquid (IL) containing a 1-butyl-3-methyl-imidazolium cation ([BMIm](+)) and various anions, such as bis (trifluoromethylsulfonyl) imide ([NTf(2)](−)), trifluoromethanesulfonate ([OTf](−)), and dicyanamide ([DCA](−)) have been obtained in this work. A number of methods, such as dynamic light scattering (DLS), scanning electron microscopy (SEM), X-ray diffraction (XRD), thermal gravimetry (TG), differential scanning calorimetry (DSC), Fourier-transform infrared (FTIR) spectroscopy, and nitrogen adsorption–desorption have been used to characterize clay, and to study the structure and thermal behaviour of the composites. It has been found that the MMT K10 powder has a narrow particle size distribution with a peak at 246 nm and a mesoporous structure (S(BET)=195 m(2)/g). According to the FTIR spectra, MMT K10/IL interaction depends on the IL type. It has been identified that confined ionic liquid interacts with both clay and adsorbed water in accordance with the hydrophilicity and size of the anion, in the following order: [DCA](−) > [OTf](−) > [NTf(2)](−). Characteristic temperatures of glass transition, crystallization, and melting have been determined for the ionic liquids under study and their MMT K10 composites. It has been revealed that when IL is adsorbed on the surface of clay, the phase transitions in IL change. The greatest changes are observed in the case of BMImNTf(2). By applying the method of thermogravimetric analysis, it is shown that composite formation is accompanied by a decrease in the IL thermal stability. Apparently, the highly developed surface of montmorillonite K10, obtained by acid treatment, plays a major role in the decrease in the IL’s thermal stability. The influence of the IL anion on the thermal and spectral characteristics of an MMT K10/IL composite was studied for the first time. MDPI 2019-08-13 /pmc/articles/PMC6721065/ /pubmed/31412560 http://dx.doi.org/10.3390/ma12162578 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Alekseeva, Olga Noskov, Andrew Grishina, Elena Ramenskaya, Lyudmila Kudryakova, Nadezhda Ivanov, Vladimir Agafonov, Alexander Structural and Thermal Properties of Montmorillonite/Ionic Liquid Composites |
title | Structural and Thermal Properties of Montmorillonite/Ionic Liquid Composites |
title_full | Structural and Thermal Properties of Montmorillonite/Ionic Liquid Composites |
title_fullStr | Structural and Thermal Properties of Montmorillonite/Ionic Liquid Composites |
title_full_unstemmed | Structural and Thermal Properties of Montmorillonite/Ionic Liquid Composites |
title_short | Structural and Thermal Properties of Montmorillonite/Ionic Liquid Composites |
title_sort | structural and thermal properties of montmorillonite/ionic liquid composites |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6721065/ https://www.ncbi.nlm.nih.gov/pubmed/31412560 http://dx.doi.org/10.3390/ma12162578 |
work_keys_str_mv | AT alekseevaolga structuralandthermalpropertiesofmontmorilloniteionicliquidcomposites AT noskovandrew structuralandthermalpropertiesofmontmorilloniteionicliquidcomposites AT grishinaelena structuralandthermalpropertiesofmontmorilloniteionicliquidcomposites AT ramenskayalyudmila structuralandthermalpropertiesofmontmorilloniteionicliquidcomposites AT kudryakovanadezhda structuralandthermalpropertiesofmontmorilloniteionicliquidcomposites AT ivanovvladimir structuralandthermalpropertiesofmontmorilloniteionicliquidcomposites AT agafonovalexander structuralandthermalpropertiesofmontmorilloniteionicliquidcomposites |