Título:	Infuence of citric acid and EFKA as dispersants on the properties of alumina monoliths produced by tert‑butyl alcohol‑based freeze‑casting
Autor(es):	Santos, Giovana Magalhães dos Faria, Anna Carolina Britto de Silva, Saulo Lucas Pereira da Ribeiro, Camila de Lima Guenka, Tomé Seichi da Nóbrega Souza, Rodrigo Nunes de Silva, João Paulo Santiago de Assis Aiube, Carlos Martins Athayde, Daniel Dornellas Lima, Luiz Fernando de Sousa Rosa, Adriano Possebon Mohallem, Nelcy Della Santina Silva, Alysson Martins Almeida
E-mail do autor:	mailto:gimagalhaes.s@gmail.com mailto:aprosa@unb.br mailto:alyssonmartins@unb.br
ORCID:	https://orcid.org/0000-0003-1156-5560 https://orcid.org/0000-0001-6946-3343 https://orcid.org/0000-0001-7280-1286 https://orcid.org/0000-0002-3648-7071 https://orcid.org/0000-0001-8692-4551 https://orcid.org/0000-0002-6200-3253 https://orcid.org/0009-0005-1755-4805 https://orcid.org/0000-0003-2614-4363 https://orcid.org/0000-0002-4883-3314 https://orcid.org/0000-0003-0856-8111 https://orcid.org/0000-0003-3255-422X https://orcid.org/0000-0002-9094-4536 https://orcid.org/0000-0001-6474-5691
Afiliação do autor:	Institute of Chemistry, University of Brasília Institute of Chemistry, University of Brasília Institute of Chemistry, University of Brasília Faculty of Technology, Department of Mechanical Engineering, University of Brasília Faculty of Technology, Department of Mechanical Engineering, University of Brasília Faculty of Technology, Department of Mechanical Engineering, University of Brasília Faculty of Technology, Department of Mechanical Engineering, University of Brasília Institute of Chemistry, University of Brasília Faculty of Technology, Department of Mechanical Engineering, University of Brasília/ Chemical Engineering Department, Federal University of Minas Gerais Chemistry Department, Federal University of Minas Gerais Faculty of Technology, Department of Mechanical Engineering, University of Brasília Chemistry Department, Federal University of Minas Gerais Faculty of Technology, Department of Mechanical Engineering, University of Brasília
Assunto:	Ácido cítrico Alumínio
Data de publicação:	16-Abr-2024
Editora:	Springer Nature
Referência:	SANTOS, 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.
Abstract:	In 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.
Unidade Acadêmica:	Instituto de Química (IQ) Faculdade de Tecnologia (FT) Departamento de Engenharia Mecânica (FT ENM)
Licença:	© The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature, 2024
DOI:	https://doi.org/10.1007/s10853-024-09589-2
Versão da editora:	https://link.springer.com/article/10.1007/s10853-024-09589-2
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