The versatile Co(2+)/Co(3+) oxidation states in cobalt alumina spinel: how to design strong blue nanometric pigments for color electrophoretic display

Blue cobalt inorganic pigments with spinel-type structure have been revisited in order to understand the origin of blackening at low temperatures and to design strong blue nanosized materials. Starting from a sol–gel process, the so-called Pechini route, the correlation between the structural featur...

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Autores principales: Serment, B., Brochon, C., Hadziioannou, G., Buffière, S., Demourgues, A., Gaudon, M.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9074073/
https://www.ncbi.nlm.nih.gov/pubmed/35529990
http://dx.doi.org/10.1039/c9ra06395a
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author Serment, B.
Brochon, C.
Hadziioannou, G.
Buffière, S.
Demourgues, A.
Gaudon, M.
author_facet Serment, B.
Brochon, C.
Hadziioannou, G.
Buffière, S.
Demourgues, A.
Gaudon, M.
author_sort Serment, B.
collection PubMed
description Blue cobalt inorganic pigments with spinel-type structure have been revisited in order to understand the origin of blackening at low temperatures and to design strong blue nanosized materials. Starting from a sol–gel process, the so-called Pechini route, the correlation between the structural features (inversion rate, Co over-stoichiometry, Co valence states) of the spinel network and its thermal history under air up to high temperatures (T = 1400 °C) allows concluding that the stabilization of CoIII in octahedral sites is at the origin of the blackening of the pigment annealed at low and medium temperatures. EELS coupled with TEM analyses (occurrence of multiple phases with various Al/Co atomic ratios) lead to us to conclude definitively about the variation of Co valence states. A top-down (mechanical grinding) and a bottom-up approach lead to the definition of a synthesis route (co-precipitation in basic medium followed by annealing at medium temperatures under Ar) allowing the design of strong blue pure nano-sized pigments to be incorporated in inks. Hybrid blue positively charged particles were mixed with white negatively charged particles to formulate dual-colour inks. A dual-colour display was filled with the as-prepared inks and tested under ±150 V.
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spelling pubmed-90740732022-05-06 The versatile Co(2+)/Co(3+) oxidation states in cobalt alumina spinel: how to design strong blue nanometric pigments for color electrophoretic display Serment, B. Brochon, C. Hadziioannou, G. Buffière, S. Demourgues, A. Gaudon, M. RSC Adv Chemistry Blue cobalt inorganic pigments with spinel-type structure have been revisited in order to understand the origin of blackening at low temperatures and to design strong blue nanosized materials. Starting from a sol–gel process, the so-called Pechini route, the correlation between the structural features (inversion rate, Co over-stoichiometry, Co valence states) of the spinel network and its thermal history under air up to high temperatures (T = 1400 °C) allows concluding that the stabilization of CoIII in octahedral sites is at the origin of the blackening of the pigment annealed at low and medium temperatures. EELS coupled with TEM analyses (occurrence of multiple phases with various Al/Co atomic ratios) lead to us to conclude definitively about the variation of Co valence states. A top-down (mechanical grinding) and a bottom-up approach lead to the definition of a synthesis route (co-precipitation in basic medium followed by annealing at medium temperatures under Ar) allowing the design of strong blue pure nano-sized pigments to be incorporated in inks. Hybrid blue positively charged particles were mixed with white negatively charged particles to formulate dual-colour inks. A dual-colour display was filled with the as-prepared inks and tested under ±150 V. The Royal Society of Chemistry 2019-10-23 /pmc/articles/PMC9074073/ /pubmed/35529990 http://dx.doi.org/10.1039/c9ra06395a Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by-nc/3.0/
spellingShingle Chemistry
Serment, B.
Brochon, C.
Hadziioannou, G.
Buffière, S.
Demourgues, A.
Gaudon, M.
The versatile Co(2+)/Co(3+) oxidation states in cobalt alumina spinel: how to design strong blue nanometric pigments for color electrophoretic display
title The versatile Co(2+)/Co(3+) oxidation states in cobalt alumina spinel: how to design strong blue nanometric pigments for color electrophoretic display
title_full The versatile Co(2+)/Co(3+) oxidation states in cobalt alumina spinel: how to design strong blue nanometric pigments for color electrophoretic display
title_fullStr The versatile Co(2+)/Co(3+) oxidation states in cobalt alumina spinel: how to design strong blue nanometric pigments for color electrophoretic display
title_full_unstemmed The versatile Co(2+)/Co(3+) oxidation states in cobalt alumina spinel: how to design strong blue nanometric pigments for color electrophoretic display
title_short The versatile Co(2+)/Co(3+) oxidation states in cobalt alumina spinel: how to design strong blue nanometric pigments for color electrophoretic display
title_sort versatile co(2+)/co(3+) oxidation states in cobalt alumina spinel: how to design strong blue nanometric pigments for color electrophoretic display
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9074073/
https://www.ncbi.nlm.nih.gov/pubmed/35529990
http://dx.doi.org/10.1039/c9ra06395a
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