Controlling the growth of zirconia needles precursor from a liquid crystal template

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dc.contributor.authorFreitas, F. G. [UNESP]
dc.contributor.authorSarmento, V. H. V. [UNESP]
dc.contributor.authorSantilli, Celso Valentim [UNESP]
dc.contributor.authorPulcinelli, Sandra Helena [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-20T15:32:00Z
dc.date.available2014-05-20T15:32:00Z
dc.date.issued2010-01-05
dc.description.abstractThis work reports the directional growth of macroscopic ceramic needles by combining a thermo-responsive Sulfated hydroxy zirconyl (SHZ) hydrosol with a swollen hexagonal liquid crystal (SHLC). The effect of the molar ratio R(s) = [Zr(4+)]/[SO(4)(2-)] on the thermo-stability of both the SHZ hydrosol and the SHLC. and also on the nucleation and 1 D-growth of ceramic particles was investigated. The dynamics of the thermo-induced aggregation growth process was monitored in situ by rheological property measurements. The results show that by increasing the R, the kinetic stability of the system in the sol state increases, leading to the formation of a less branched framework during the thermo-induced aggregation process. Furthermore, the small-angle X-ray diffraction (XRD) results show that the thermo-stability of the SHLC employed as soft template is improved by increasing the R, Both effects allow us to induce the particle's nucleation by heating the SHLC template to a moderate temperature (approximate to 50 degrees C), while the kinetics of the needle's growth is enhanced by increasing the [Zr(4+)]/[SO(4)(2-)] molar ratio. (C) 2009 Elsevier B.V. All rights reserved.en
dc.description.affiliationUNESP, Inst Quim, BR-14801970 Araraquara, SP, Brazil
dc.description.affiliationUnespUNESP, Inst Quim, BR-14801970 Araraquara, SP, Brazil
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.format.extent77-82
dc.identifierhttp://dx.doi.org/10.1016/j.colsurfa.2009.10.024
dc.identifier.citationColloids and Surfaces A-physicochemical and Engineering Aspects. Amsterdam: Elsevier B.V., v. 353, n. 1, p. 77-82, 2010.
dc.identifier.doi10.1016/j.colsurfa.2009.10.024
dc.identifier.issn0927-7757
dc.identifier.lattes5584298681870865
dc.identifier.lattes9971202585286967
dc.identifier.orcid0000-0002-8356-8093
dc.identifier.urihttp://hdl.handle.net/11449/41014
dc.identifier.wosWOS:000273857500010
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofColloids and Surfaces A: Physicochemical and Engineering Aspects
dc.relation.ispartofjcr2.829
dc.relation.ispartofsjr0,753
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectSol-gel processesen
dc.subjectLiquid crystal templateen
dc.subjectZirconia needles precursoren
dc.titleControlling the growth of zirconia needles precursor from a liquid crystal templateen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.
unesp.author.lattes9971202585286967
unesp.author.lattes5584298681870865[3]
unesp.author.orcid0000-0002-8356-8093[3]
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Química, Araraquarapt

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Artigos - Físico Química - IQ