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Mechanistic Insight into Etching Chemistry and HF-Assisted Etching of MgO-Al(2)O(3)-SiO(2) Glass-Ceramic
The present study focuses on the etching conditions and mechanism of MgO-Al(2)O(3)-SiO(2) glass-ceramic (MAS) in hydrofluoric acid (HF). The results show that the amorphous phase has 218 times higher etching rate than pure cordierite crystal at room temperature. In addition, the activation energies...
Autores principales: | , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6165153/ https://www.ncbi.nlm.nih.gov/pubmed/30200605 http://dx.doi.org/10.3390/ma11091631 |
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author | Ji, Yanxin Yang, Shun Li, Zhulian Duan, Junjie Xu, Meng Jiang, Hong Li, Changjiu Chen, Yongjun |
author_facet | Ji, Yanxin Yang, Shun Li, Zhulian Duan, Junjie Xu, Meng Jiang, Hong Li, Changjiu Chen, Yongjun |
author_sort | Ji, Yanxin |
collection | PubMed |
description | The present study focuses on the etching conditions and mechanism of MgO-Al(2)O(3)-SiO(2) glass-ceramic (MAS) in hydrofluoric acid (HF). The results show that the amorphous phase has 218 times higher etching rate than pure cordierite crystal at room temperature. In addition, the activation energies of cordierite and amorphous phases in the HF solution are 52.5 and 30.6 kJ/mol, respectively. The time (t(ad)) taken for complete dissolution of the amorphous phase depends on the HF concentration (C(HF)). Based on the etching experiments, a new model is established and refined to assess the t(ad) evolution. In addition, a highly crystalline cordierite phase, with the high specific surface area (59.4 m(2)·g(−1)) and mesoporous structure, has been obtained by HF etching. This paper presents novel insights into the etching chemistry and opens up avenues for further research in the area of cordierite-based catalytic ceramics. |
format | Online Article Text |
id | pubmed-6165153 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-61651532018-10-12 Mechanistic Insight into Etching Chemistry and HF-Assisted Etching of MgO-Al(2)O(3)-SiO(2) Glass-Ceramic Ji, Yanxin Yang, Shun Li, Zhulian Duan, Junjie Xu, Meng Jiang, Hong Li, Changjiu Chen, Yongjun Materials (Basel) Article The present study focuses on the etching conditions and mechanism of MgO-Al(2)O(3)-SiO(2) glass-ceramic (MAS) in hydrofluoric acid (HF). The results show that the amorphous phase has 218 times higher etching rate than pure cordierite crystal at room temperature. In addition, the activation energies of cordierite and amorphous phases in the HF solution are 52.5 and 30.6 kJ/mol, respectively. The time (t(ad)) taken for complete dissolution of the amorphous phase depends on the HF concentration (C(HF)). Based on the etching experiments, a new model is established and refined to assess the t(ad) evolution. In addition, a highly crystalline cordierite phase, with the high specific surface area (59.4 m(2)·g(−1)) and mesoporous structure, has been obtained by HF etching. This paper presents novel insights into the etching chemistry and opens up avenues for further research in the area of cordierite-based catalytic ceramics. MDPI 2018-09-06 /pmc/articles/PMC6165153/ /pubmed/30200605 http://dx.doi.org/10.3390/ma11091631 Text en © 2018 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 Ji, Yanxin Yang, Shun Li, Zhulian Duan, Junjie Xu, Meng Jiang, Hong Li, Changjiu Chen, Yongjun Mechanistic Insight into Etching Chemistry and HF-Assisted Etching of MgO-Al(2)O(3)-SiO(2) Glass-Ceramic |
title | Mechanistic Insight into Etching Chemistry and HF-Assisted Etching of MgO-Al(2)O(3)-SiO(2) Glass-Ceramic |
title_full | Mechanistic Insight into Etching Chemistry and HF-Assisted Etching of MgO-Al(2)O(3)-SiO(2) Glass-Ceramic |
title_fullStr | Mechanistic Insight into Etching Chemistry and HF-Assisted Etching of MgO-Al(2)O(3)-SiO(2) Glass-Ceramic |
title_full_unstemmed | Mechanistic Insight into Etching Chemistry and HF-Assisted Etching of MgO-Al(2)O(3)-SiO(2) Glass-Ceramic |
title_short | Mechanistic Insight into Etching Chemistry and HF-Assisted Etching of MgO-Al(2)O(3)-SiO(2) Glass-Ceramic |
title_sort | mechanistic insight into etching chemistry and hf-assisted etching of mgo-al(2)o(3)-sio(2) glass-ceramic |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6165153/ https://www.ncbi.nlm.nih.gov/pubmed/30200605 http://dx.doi.org/10.3390/ma11091631 |
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