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dc.contributor.authorSantos, Giovana Magalhães dos-
dc.contributor.authorFaria, Anna Carolina Britto de-
dc.contributor.authorSilva, Saulo Lucas Pereira da-
dc.contributor.authorRibeiro, Camila de Lima-
dc.contributor.authorGuenka, Tomé Seichi da Nóbrega-
dc.contributor.authorSouza, Rodrigo Nunes de-
dc.contributor.authorSilva, João Paulo Santiago de Assis-
dc.contributor.authorAiube, Carlos Martins-
dc.contributor.authorAthayde, Daniel Dornellas-
dc.contributor.authorLima, Luiz Fernando de Sousa-
dc.contributor.authorRosa, Adriano Possebon-
dc.contributor.authorMohallem, Nelcy Della Santina-
dc.contributor.authorSilva, Alysson Martins Almeida-
dc.date.accessioned2025-03-17T22:19:54Z-
dc.date.available2025-03-17T22:19:54Z-
dc.date.issued2024-04-16-
dc.identifier.citationSANTOS, Giovana Magalhães dos et al. Infuence of citric acid and EFKA as dispersants on the properties of alumina monoliths produced by tert‑butyl alcohol‑based freeze‑casting. Journal of Materials Science , v. 59, n. 16, p. 6711–6731, 2024. DOI 10.1007/s10853-024-09589-2. Disponível em: https://link.springer.com/article/10.1007/s10853-024-09589-2. Acesso em: 17 mar. 2025.pt_BR
dc.identifier.urihttp://repositorio.unb.br/handle/10482/51956-
dc.language.isoengpt_BR
dc.publisherSpringer Naturept_BR
dc.rightsAcesso Restritopt_BR
dc.titleInfuence of citric acid and EFKA as dispersants on the properties of alumina monoliths produced by tert‑butyl alcohol‑based freeze‑castingpt_BR
dc.typeArtigopt_BR
dc.subject.keywordÁcido cítricopt_BR
dc.subject.keywordAlumíniopt_BR
dc.rights.license© The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature, 2024pt_BR
dc.identifier.doihttps://doi.org/10.1007/s10853-024-09589-2pt_BR
dc.relation.publisherversionhttps://link.springer.com/article/10.1007/s10853-024-09589-2pt_BR
dc.description.abstract1In this paper, EFKA FA 4663 (EFKA) dispersant was used for the first time in the alumina slurries tert-butyl alcohol-based freeze-casting and compared to the commonly used anionic dispersant citric acid (CA). The comparison of both dispersants was analyzed at the beginning of the process at different ultra-low freezing temperatures (− 170 to − 130 °C). The monoliths obtained with EFKA presented promising properties due to its stabilization of alumina particles by both electrostatic interactions and steric impediment, a considerable improvement when compared to the CA that promotes the stabilization of alumina particles only by electrostatic interaction. The use of different dispersants, as well as the control of freezing temperature, significantly influenced the microstructural properties of the monoliths. The monoliths exhibited prismatic pore geometry with high connectivity, forming a complex pore channel with total porosity up to 64.7%, and open porosity up to 48.5%. Results confirmed that the modification of the type of dispersant led to a difference in the grain size (up to 23.1%) and pore size (up to 30.5%) obtained in the materials. The monoliths produced with EFKA dispersant presented a considerable compressive strength resistance up to 11.7 MPa due to its dispersion mechanism that provided the thickening of the walls, confirming that the type of dispersion has a strong influence on the final properties of the materials. Therefore, the type of dispersant proved to be another parameter that allows the refinement of alumina monoliths properties, highlighting the use of EFKA as a promising alternative in the system studied.pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0003-1156-5560pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0001-6946-3343pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0001-7280-1286pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0002-3648-7071pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0001-8692-4551pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0002-6200-3253pt_BR
dc.identifier.orcidhttps://orcid.org/0009-0005-1755-4805pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0003-2614-4363pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0002-4883-3314pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0003-0856-8111pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0003-3255-422Xpt_BR
dc.identifier.orcidhttps://orcid.org/0000-0002-9094-4536pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0001-6474-5691pt_BR
dc.contributor.emailmailto:gimagalhaes.s@gmail.compt_BR
dc.contributor.emailmailto:aprosa@unb.brpt_BR
dc.contributor.emailmailto:alyssonmartins@unb.brpt_BR
dc.contributor.affiliationInstitute of Chemistry, University of Brasíliapt_BR
dc.contributor.affiliationInstitute of Chemistry, University of Brasíliapt_BR
dc.contributor.affiliationInstitute of Chemistry, University of Brasíliapt_BR
dc.contributor.affiliationFaculty of Technology, Department of Mechanical Engineering, University of Brasíliapt_BR
dc.contributor.affiliationFaculty of Technology, Department of Mechanical Engineering, University of Brasíliapt_BR
dc.contributor.affiliationFaculty of Technology, Department of Mechanical Engineering, University of Brasíliapt_BR
dc.contributor.affiliationFaculty of Technology, Department of Mechanical Engineering, University of Brasíliapt_BR
dc.contributor.affiliationInstitute of Chemistry, University of Brasíliapt_BR
dc.contributor.affiliationFaculty of Technology, Department of Mechanical Engineering, University of Brasília/ Chemical Engineering Department, Federal University of Minas Geraispt_BR
dc.contributor.affiliationChemistry Department, Federal University of Minas Geraispt_BR
dc.contributor.affiliationFaculty of Technology, Department of Mechanical Engineering, University of Brasíliapt_BR
dc.contributor.affiliationChemistry Department, Federal University of Minas Geraispt_BR
dc.contributor.affiliationFaculty of Technology, Department of Mechanical Engineering, University of Brasíliapt_BR
dc.description.unidadeInstituto de Química (IQ)pt_BR
dc.description.unidadeFaculdade de Tecnologia (FT)pt_BR
dc.description.unidadeDepartamento de Engenharia Mecânica (FT ENM)pt_BR
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