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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...

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Autores principales: Olguin, Gianni, Yacou, Christelle, Smart, Simon, Diniz da Costa, João C.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2013
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.
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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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