Evaluation of mechanochemical and hydrothermal transformations in a wet-milled alumina by transmission electron microscopy and thermal analysis

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dc.contributor.authorYoshimura H.N.
dc.contributor.authorde Lima M.B.
dc.contributor.authorSantos S.F.
dc.contributor.authorOrtega F.S.
dc.date.accessioned2019-08-20T00:17:41Z
dc.date.available2019-08-20T00:17:41Z
dc.date.issued2017
dc.description.abstract© 2017 Trans Tech Publications, Switzerland.Milling and hydrothermal treatment of alumina powders in aqueous medium can result in surface transformations generating aluminum hydroxides. The aim of this work was to advance the understanding on these transformations. A α-alumina powder was ball milled in water at different pHs for 10 h, and then autoclaved (150 °C, 3 atm, 3 h). The powders were analyzed by transmission electron microscopy, differential scanning calorimetry simultaneously with thermogravimetry, Xray diffraction, and infrared spectroscopy. It was observed that milling in basic medium caused the formation of doyleite [Al(OH3)] nanoparticles, which were fully converted to boehmite (AlOOH) by hydrothermal treatment. The boehmite fraction determined by thermal analysis was 1.7 wt%. The powder milled in acid medium had no mechanochemical and hydrothermal transformations.
dc.description.firstpage46
dc.description.lastpage51
dc.description.volume881 MSF
dc.identifier.citationYOSHIMURA, HUMBERTO NAOYUKI; DE LIMA, MAURÍCIO BATISTA; SANTOS, SYDNEY FERREIRA; Ortega, Fernando dos Santos. Evaluation of Mechanochemical and Hydrothermal Transformations in a Wet-Milled Alumina by Transmission Electron Microscopy and Thermal Analysis. Materials Science Forum (Online), v. 881, p. 46-51, 2016.
dc.identifier.doi10.4028/www.scientific.net/MSF.881.46
dc.identifier.issn1662-9752
dc.identifier.urihttps://repositorio.fei.edu.br/handle/FEI/2352
dc.relation.ispartofMaterials Science Forum
dc.rightsAcesso Restrito
dc.subject.otherlanguageAlumina
dc.subject.otherlanguageHydrothermal treatment
dc.subject.otherlanguageMechanochemical transformation
dc.subject.otherlanguageMilling
dc.titleEvaluation of mechanochemical and hydrothermal transformations in a wet-milled alumina by transmission electron microscopy and thermal analysis
dc.typeArtigo de evento
fei.scopus.citations1
fei.scopus.eid2-s2.0-85009775744
fei.scopus.subjectAlpha alumina
fei.scopus.subjectAlumina powder
fei.scopus.subjectAqueous medium
fei.scopus.subjectHydrothermal transformation
fei.scopus.subjectHydrothermal treatments
fei.scopus.subjectMechanochemical transformations
fei.scopus.subjectMechanochemicals
fei.scopus.subjectSurface transformations
fei.scopus.updated2024-03-04
fei.scopus.urlhttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85009775744&origin=inward
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