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...
Autores principales: | , , , , , |
---|---|
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 |
_version_ | 1784701411282386944 |
---|---|
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. |
format | Online Article Text |
id | pubmed-9074073 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | The Royal Society of Chemistry |
record_format | MEDLINE/PubMed |
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 |
work_keys_str_mv | AT sermentb theversatileco2co3oxidationstatesincobaltaluminaspinelhowtodesignstrongbluenanometricpigmentsforcolorelectrophoreticdisplay AT brochonc theversatileco2co3oxidationstatesincobaltaluminaspinelhowtodesignstrongbluenanometricpigmentsforcolorelectrophoreticdisplay AT hadziioannoug theversatileco2co3oxidationstatesincobaltaluminaspinelhowtodesignstrongbluenanometricpigmentsforcolorelectrophoreticdisplay AT buffieres theversatileco2co3oxidationstatesincobaltaluminaspinelhowtodesignstrongbluenanometricpigmentsforcolorelectrophoreticdisplay AT demourguesa theversatileco2co3oxidationstatesincobaltaluminaspinelhowtodesignstrongbluenanometricpigmentsforcolorelectrophoreticdisplay AT gaudonm theversatileco2co3oxidationstatesincobaltaluminaspinelhowtodesignstrongbluenanometricpigmentsforcolorelectrophoreticdisplay AT sermentb versatileco2co3oxidationstatesincobaltaluminaspinelhowtodesignstrongbluenanometricpigmentsforcolorelectrophoreticdisplay AT brochonc versatileco2co3oxidationstatesincobaltaluminaspinelhowtodesignstrongbluenanometricpigmentsforcolorelectrophoreticdisplay AT hadziioannoug versatileco2co3oxidationstatesincobaltaluminaspinelhowtodesignstrongbluenanometricpigmentsforcolorelectrophoreticdisplay AT buffieres versatileco2co3oxidationstatesincobaltaluminaspinelhowtodesignstrongbluenanometricpigmentsforcolorelectrophoreticdisplay AT demourguesa versatileco2co3oxidationstatesincobaltaluminaspinelhowtodesignstrongbluenanometricpigmentsforcolorelectrophoreticdisplay AT gaudonm versatileco2co3oxidationstatesincobaltaluminaspinelhowtodesignstrongbluenanometricpigmentsforcolorelectrophoreticdisplay |