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dc.contributor.authorMartins, G. F.-
dc.contributor.authorPereira, A. A.-
dc.contributor.authorStraccalano, B. A.-
dc.contributor.authorAntunes, P. A.-
dc.contributor.authorPasquini, D.-
dc.contributor.authorCurvelo, A. A. S.-
dc.contributor.authorFerreira, M.-
dc.contributor.authorRiul, A.-
dc.contributor.authorConstantino, C. J. L.-
dc.identifier.citationSensors and Actuators B-chemical. Lausanne: Elsevier B.V. Sa, v. 129, n. 2, p. 525-530, 2008.-
dc.description.abstractLignins extracted from sugar cane bagasse using different alcohols in the organosolv-CO(2) supercritical pulping process have been applied in the fabrication of ultrathin films through the Langmuir-Blodgett technique. Langmuir films were characterized by surface pressure versus mean molecular area (Pi-A) isotherms to exploit the sensitivity of nanostructured lignin films to metallic ions (Cu(2+), Cd(2+) and Pb(2+)). The Pi-A isotherms were shifted to larger molecular areas when heavy metal ions are present into the subphase, which might be related to electrostatic repulsions between metallic ions entrapped within the lignin molecular structure. Taking the advantage of metal incorporation, Langmuir monolayers were transferred onto solid substrates forming Langmuir-Blodgett (LB) films to be used as a transducer in an "electronic tongue" system to detect Cu(2+) in aqueous solution below threshold standard established by the Brazilian regulation. Both techniques impedance spectroscopy and electrochemistry have been used in these experiments. Complementary, Fourier transform infrared (FTIR) spectroscopy recorded for LB films before and after soaking into Cu(2+) aqueous solution revealed an interaction between the lignin phenyl groups and the metallic ion. (C) 2007 Elsevier B.V.. All rights reserved.en
dc.publisherElsevier B.V. Sa-
dc.sourceWeb of Science-
dc.subjectLangmuir-Blodgett filmsen
dc.subjectmetallic ionsen
dc.titleUltrathin films of lignins as a potential transducer in sensing applications involving heavy metal ionsen
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)-
dc.contributor.institutionUniversidade do Oeste Paulista (UNOESTE)-
dc.contributor.institutionUniversidade de São Paulo (USP)-
dc.contributor.institutionUniversidade Federal de São Carlos (UFSCar)-
dc.description.affiliationUniv Estadual Paulista, Fac Ciencias & Tecnol, DFQB, BR-19060900 São Paulo, Brazil-
dc.description.affiliationUNOESTE, Fac Ciencias Letras & Educa, BR-19050900 São Paulo, Brazil-
dc.description.affiliationUSP, Inst Quim São Carlos, BR-13560970 São Carlos, SP, Brazil-
dc.description.affiliationUniversidade Federal de São Carlos (UFSCar), BR-18043970 São Carlos, SP, Brazil-
dc.description.affiliationUnespUniv Estadual Paulista, Fac Ciencias & Tecnol, DFQB, BR-19060900 São Paulo, Brazil-
dc.rights.accessRightsAcesso restrito-
dc.relation.ispartofSensors and Actuators B: Chemical-
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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