Design of alumina monoliths by emulsion-gel casting: understanding the monolith structure from a rheological approach
Autor(a) principal: | |
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Data de Publicação: | 2018 |
Outros Autores: | , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10773/37000 |
Resumo: | Multimodal porous cellular alumina structures (monoliths) were prepared by an emulsion-gel casting technique using eco-friendly and inexpensive lipids such as corn oil, castor oil, margarine and their mixtures as the dispersed phase. The monoliths obtained showed good mechanical stability, exhibiting compressive strengths in the range of 8–50 N·mm−2. Mercury intrusion porosimetry analysis showed that the monoliths produced presented porosities ranging from 28% to 60% and average pore sizes within 0.2–3.2 μm. The formation of the porous networks was interpreted based on combined droplet coalescence, flocculation and Ostwald ripening effects. The presence of such effects along the emulsion storage time led to changes in their viscoelastic and morphological properties, which were found to correlate with structural descriptors of monoliths after sintering (e.g. average pore sizes and porosity). These correlations open up the possibility to anticipate the final structure of the monoliths and adjust emulsion-gel conditions to produce customized cellular structures with fine-tuned porosities and pore sizes, envisaging their application in membrane processes or chromatography. |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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7160 |
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Design of alumina monoliths by emulsion-gel casting: understanding the monolith structure from a rheological approachAlumina monolithsEmulsion-gel castingViscoelastic propertiesPorous structureChromatographyMultimodal porous cellular alumina structures (monoliths) were prepared by an emulsion-gel casting technique using eco-friendly and inexpensive lipids such as corn oil, castor oil, margarine and their mixtures as the dispersed phase. The monoliths obtained showed good mechanical stability, exhibiting compressive strengths in the range of 8–50 N·mm−2. Mercury intrusion porosimetry analysis showed that the monoliths produced presented porosities ranging from 28% to 60% and average pore sizes within 0.2–3.2 μm. The formation of the porous networks was interpreted based on combined droplet coalescence, flocculation and Ostwald ripening effects. The presence of such effects along the emulsion storage time led to changes in their viscoelastic and morphological properties, which were found to correlate with structural descriptors of monoliths after sintering (e.g. average pore sizes and porosity). These correlations open up the possibility to anticipate the final structure of the monoliths and adjust emulsion-gel conditions to produce customized cellular structures with fine-tuned porosities and pore sizes, envisaging their application in membrane processes or chromatography.Elsevier2023-04-13T14:59:12Z2018-11-05T00:00:00Z2018-11-05info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10773/37000eng0264-127510.1016/j.matdes.2018.07.017Nayak, NayanVitorino, NunoFrade, Jorge R.Kovalevsky, Andrei V.Alves, Vitor D.Crespo, João G.Portugal, Carla A.M.info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-05-06T04:44:29Zoai:ria.ua.pt:10773/37000Portal AgregadorONGhttps://www.rcaap.pt/oai/openairemluisa.alvim@gmail.comopendoar:71602024-05-06T04:44:29Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Design of alumina monoliths by emulsion-gel casting: understanding the monolith structure from a rheological approach |
title |
Design of alumina monoliths by emulsion-gel casting: understanding the monolith structure from a rheological approach |
spellingShingle |
Design of alumina monoliths by emulsion-gel casting: understanding the monolith structure from a rheological approach Nayak, Nayan Alumina monoliths Emulsion-gel casting Viscoelastic properties Porous structure Chromatography |
title_short |
Design of alumina monoliths by emulsion-gel casting: understanding the monolith structure from a rheological approach |
title_full |
Design of alumina monoliths by emulsion-gel casting: understanding the monolith structure from a rheological approach |
title_fullStr |
Design of alumina monoliths by emulsion-gel casting: understanding the monolith structure from a rheological approach |
title_full_unstemmed |
Design of alumina monoliths by emulsion-gel casting: understanding the monolith structure from a rheological approach |
title_sort |
Design of alumina monoliths by emulsion-gel casting: understanding the monolith structure from a rheological approach |
author |
Nayak, Nayan |
author_facet |
Nayak, Nayan Vitorino, Nuno Frade, Jorge R. Kovalevsky, Andrei V. Alves, Vitor D. Crespo, João G. Portugal, Carla A.M. |
author_role |
author |
author2 |
Vitorino, Nuno Frade, Jorge R. Kovalevsky, Andrei V. Alves, Vitor D. Crespo, João G. Portugal, Carla A.M. |
author2_role |
author author author author author author |
dc.contributor.author.fl_str_mv |
Nayak, Nayan Vitorino, Nuno Frade, Jorge R. Kovalevsky, Andrei V. Alves, Vitor D. Crespo, João G. Portugal, Carla A.M. |
dc.subject.por.fl_str_mv |
Alumina monoliths Emulsion-gel casting Viscoelastic properties Porous structure Chromatography |
topic |
Alumina monoliths Emulsion-gel casting Viscoelastic properties Porous structure Chromatography |
description |
Multimodal porous cellular alumina structures (monoliths) were prepared by an emulsion-gel casting technique using eco-friendly and inexpensive lipids such as corn oil, castor oil, margarine and their mixtures as the dispersed phase. The monoliths obtained showed good mechanical stability, exhibiting compressive strengths in the range of 8–50 N·mm−2. Mercury intrusion porosimetry analysis showed that the monoliths produced presented porosities ranging from 28% to 60% and average pore sizes within 0.2–3.2 μm. The formation of the porous networks was interpreted based on combined droplet coalescence, flocculation and Ostwald ripening effects. The presence of such effects along the emulsion storage time led to changes in their viscoelastic and morphological properties, which were found to correlate with structural descriptors of monoliths after sintering (e.g. average pore sizes and porosity). These correlations open up the possibility to anticipate the final structure of the monoliths and adjust emulsion-gel conditions to produce customized cellular structures with fine-tuned porosities and pore sizes, envisaging their application in membrane processes or chromatography. |
publishDate |
2018 |
dc.date.none.fl_str_mv |
2018-11-05T00:00:00Z 2018-11-05 2023-04-13T14:59:12Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10773/37000 |
url |
http://hdl.handle.net/10773/37000 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
0264-1275 10.1016/j.matdes.2018.07.017 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Elsevier |
publisher.none.fl_str_mv |
Elsevier |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
instname_str |
Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
mluisa.alvim@gmail.com |
_version_ |
1817543849276342272 |