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Tailoring the oxidation state of cobalt through halide functionality in sol-gel silica
The functionality or oxidation state of cobalt within a silica matrix can be tailored through the use of cationic surfactants and their halide counter ions during the sol-gel synthesis. Simply by adding surfactant we could significantly increase the amount of cobalt existing as Co(3)O(4) within the...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group
2013
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3769890/ https://www.ncbi.nlm.nih.gov/pubmed/24022785 http://dx.doi.org/10.1038/srep02449 |
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author | Olguin, Gianni Yacou, Christelle Smart, Simon Diniz da Costa, João C. |
author_facet | Olguin, Gianni Yacou, Christelle Smart, Simon Diniz da Costa, João C. |
author_sort | Olguin, Gianni |
collection | PubMed |
description | The functionality or oxidation state of cobalt within a silica matrix can be tailored through the use of cationic surfactants and their halide counter ions during the sol-gel synthesis. Simply by adding surfactant we could significantly increase the amount of cobalt existing as Co(3)O(4) within the silica from 44% to 77%, without varying the cobalt precursor concentration. However, once the surfactant to cobalt ratio exceeded 1, further addition resulted in an inhibitory mechanism whereby the altered pyrolysis of the surfactant decreased Co(3)O(4) production. These findings have significant implications for the production of cobalt/silica composites where maximizing the functional Co(3)O(4) phase remains the goal for a broad range of catalytic, sensing and materials applications. |
format | Online Article Text |
id | pubmed-3769890 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2013 |
publisher | Nature Publishing Group |
record_format | MEDLINE/PubMed |
spelling | pubmed-37698902013-09-12 Tailoring the oxidation state of cobalt through halide functionality in sol-gel silica Olguin, Gianni Yacou, Christelle Smart, Simon Diniz da Costa, João C. Sci Rep Article The functionality or oxidation state of cobalt within a silica matrix can be tailored through the use of cationic surfactants and their halide counter ions during the sol-gel synthesis. Simply by adding surfactant we could significantly increase the amount of cobalt existing as Co(3)O(4) within the silica from 44% to 77%, without varying the cobalt precursor concentration. However, once the surfactant to cobalt ratio exceeded 1, further addition resulted in an inhibitory mechanism whereby the altered pyrolysis of the surfactant decreased Co(3)O(4) production. These findings have significant implications for the production of cobalt/silica composites where maximizing the functional Co(3)O(4) phase remains the goal for a broad range of catalytic, sensing and materials applications. Nature Publishing Group 2013-08-15 /pmc/articles/PMC3769890/ /pubmed/24022785 http://dx.doi.org/10.1038/srep02449 Text en Copyright © 2013, Macmillan Publishers Limited. All rights reserved http://creativecommons.org/licenses/by-nc-nd/3.0/ This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-nd/3.0/ |
spellingShingle | Article Olguin, Gianni Yacou, Christelle Smart, Simon Diniz da Costa, João C. Tailoring the oxidation state of cobalt through halide functionality in sol-gel silica |
title | Tailoring the oxidation state of cobalt through halide functionality in sol-gel silica |
title_full | Tailoring the oxidation state of cobalt through halide functionality in sol-gel silica |
title_fullStr | Tailoring the oxidation state of cobalt through halide functionality in sol-gel silica |
title_full_unstemmed | Tailoring the oxidation state of cobalt through halide functionality in sol-gel silica |
title_short | Tailoring the oxidation state of cobalt through halide functionality in sol-gel silica |
title_sort | tailoring the oxidation state of cobalt through halide functionality in sol-gel silica |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3769890/ https://www.ncbi.nlm.nih.gov/pubmed/24022785 http://dx.doi.org/10.1038/srep02449 |
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