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Enhancement and mechanism of vermiculite thermal expansion modified by sodium ions

Aimed at improving vermiculite's thermal expansibility, a novel method of Na(+) modification has been proposed. The modification effects were characterized via X-ray fluorescence spectroscopy, X-ray diffraction, and thermogravimetric-differential thermal analysis. The result indicated that sodi...

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Autores principales: Feng, Jinpeng, Liu, Meng, Fu, Linzong, Zhang, Kan, Xie, Zhenhui, Shi, Dawei, Ma, Xin
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9049839/
https://www.ncbi.nlm.nih.gov/pubmed/35492200
http://dx.doi.org/10.1039/d0ra00223b
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author Feng, Jinpeng
Liu, Meng
Fu, Linzong
Zhang, Kan
Xie, Zhenhui
Shi, Dawei
Ma, Xin
author_facet Feng, Jinpeng
Liu, Meng
Fu, Linzong
Zhang, Kan
Xie, Zhenhui
Shi, Dawei
Ma, Xin
author_sort Feng, Jinpeng
collection PubMed
description Aimed at improving vermiculite's thermal expansibility, a novel method of Na(+) modification has been proposed. The modification effects were characterized via X-ray fluorescence spectroscopy, X-ray diffraction, and thermogravimetric-differential thermal analysis. The result indicated that sodium ions entered vermiculite interlayers through the exchange of interlamellar calcium ions. The effects of the heating time on the expansion ratio of Raw-V and Na-V samples were investigated at the temperature range of 400–700 °C. The result indicated that the maximum increment in the expansion ratio could reach up to 26.5% after Na(+) modification. The influencing mechanism of Na(+) modification on the thermal expansibility of vermiculite was explored via molecular dynamics simulation and the binding energy and dehydration enthalpy change calculation. The simulation and calculation results showed a good agreement with the expansion experiment result. This study provides a novel method for the preparation of high-performance expanded vermiculite.
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spelling pubmed-90498392022-04-29 Enhancement and mechanism of vermiculite thermal expansion modified by sodium ions Feng, Jinpeng Liu, Meng Fu, Linzong Zhang, Kan Xie, Zhenhui Shi, Dawei Ma, Xin RSC Adv Chemistry Aimed at improving vermiculite's thermal expansibility, a novel method of Na(+) modification has been proposed. The modification effects were characterized via X-ray fluorescence spectroscopy, X-ray diffraction, and thermogravimetric-differential thermal analysis. The result indicated that sodium ions entered vermiculite interlayers through the exchange of interlamellar calcium ions. The effects of the heating time on the expansion ratio of Raw-V and Na-V samples were investigated at the temperature range of 400–700 °C. The result indicated that the maximum increment in the expansion ratio could reach up to 26.5% after Na(+) modification. The influencing mechanism of Na(+) modification on the thermal expansibility of vermiculite was explored via molecular dynamics simulation and the binding energy and dehydration enthalpy change calculation. The simulation and calculation results showed a good agreement with the expansion experiment result. This study provides a novel method for the preparation of high-performance expanded vermiculite. The Royal Society of Chemistry 2020-02-20 /pmc/articles/PMC9049839/ /pubmed/35492200 http://dx.doi.org/10.1039/d0ra00223b Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by-nc/3.0/
spellingShingle Chemistry
Feng, Jinpeng
Liu, Meng
Fu, Linzong
Zhang, Kan
Xie, Zhenhui
Shi, Dawei
Ma, Xin
Enhancement and mechanism of vermiculite thermal expansion modified by sodium ions
title Enhancement and mechanism of vermiculite thermal expansion modified by sodium ions
title_full Enhancement and mechanism of vermiculite thermal expansion modified by sodium ions
title_fullStr Enhancement and mechanism of vermiculite thermal expansion modified by sodium ions
title_full_unstemmed Enhancement and mechanism of vermiculite thermal expansion modified by sodium ions
title_short Enhancement and mechanism of vermiculite thermal expansion modified by sodium ions
title_sort enhancement and mechanism of vermiculite thermal expansion modified by sodium ions
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9049839/
https://www.ncbi.nlm.nih.gov/pubmed/35492200
http://dx.doi.org/10.1039/d0ra00223b
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