Surface morphology and molecular organization of lignins in Langmuir-Blodgett films

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dc.contributor.authorPasquini, D.
dc.contributor.authorBalogh, D. T.
dc.contributor.authorAntunes, P. A.
dc.contributor.authorConstantino, CJL
dc.contributor.authorCurvelo, AAS
dc.contributor.authorAroca, R. F.
dc.contributor.authorOliveira, O. N.
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniv Windsor
dc.date.accessioned2014-05-20T15:24:10Z
dc.date.available2014-05-20T15:24:10Z
dc.date.issued2002-08-20
dc.description.abstractAtomic force microscopy (AFM) and Fourier transform infrared spectroscopy (FTIR) are used to investigate molecular organization in Langmuir-Blodgett (LB) films of two kinds of lignins. The lignins were extracted from sugar cane bagasse using distinct extraction processes and are referred to here as ethanol lignin (EL) and saccharification lignin (SAC). AFM images show that LB films from EL have a flat surface in comparison with those from SAC. For the latter, ellipsoidal aggregates are seen oriented perpendicularly to the substrate. This result is confirmed by a combination of transmission and reflection FTIR measurements, which also point to lignin aggregates preferentially oriented perpendicularly to the substrate. For LB films from EL, on the other hand, aggregates are preferentially oriented parallel to the substrate, again consistent with the flat surface observed in AFM data. The vibrational spectroscopy data for cast films from both lignins show random molecular organization, as one should expect.en
dc.description.affiliationUniv São Paulo, Inst Fis Sao Carlos, BR-13560970 Sao Carlos, SP, Brazil
dc.description.affiliationUniv São Paulo, Inst Quim Sao Carlos, BR-13560970 Sao Carlos, SP, Brazil
dc.description.affiliationUniv Estadual Paulista, Fac Ciências & Tecnol, BR-19060900 Presidente Prudente, SP, Brazil
dc.description.affiliationUniv Windsor, Mat & Surface Sci Grp, Sch Phys Sci, Windsor, ON N9B 3P4, Canada
dc.description.affiliationUnespUniv Estadual Paulista, Fac Ciências & Tecnol, BR-19060900 Presidente Prudente, SP, Brazil
dc.format.extent6593-6596
dc.identifierhttp://dx.doi.org/10.1021/la025729v
dc.identifier.citationLangmuir. Washington: Amer Chemical Soc, v. 18, n. 17, p. 6593-6596, 2002.
dc.identifier.doi10.1021/la025729v
dc.identifier.issn0743-7463
dc.identifier.urihttp://hdl.handle.net/11449/34813
dc.identifier.wosWOS:000177487600020
dc.language.isoeng
dc.publisherAmer Chemical Soc
dc.relation.ispartofLangmuir
dc.relation.ispartofjcr3.789
dc.relation.ispartofsjr1,479
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.titleSurface morphology and molecular organization of lignins in Langmuir-Blodgett filmsen
dc.typeArtigo
dcterms.licensehttp://pubs.acs.org/paragonplus/copyright/jpa_form_a.pdf
dcterms.rightsHolderAmer Chemical Soc
unesp.author.orcid0000-0002-5399-5860[7]
unesp.author.orcid0000-0002-9196-3982[2]
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Ciências e Tecnologia, Presidente Prudentept

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Artigos - Física, Química e Biologia - FCT