The use of molecular probes for the characterization of dispersions of functionalized silica nanoparticles

dc.creatorArce, VB
dc.creatorBertolotti, SG
dc.creatorOliveira, FJVE
dc.creatorAiroldi, C
dc.creatorGonzalez, MC
dc.creatorAllegretti, PE
dc.creatorMartire, DO
dc.date2009
dc.dateJUL
dc.date2014-11-17T20:37:00Z
dc.date2015-11-26T16:46:22Z
dc.date2014-11-17T20:37:00Z
dc.date2015-11-26T16:46:22Z
dc.date.accessioned2018-03-28T23:32:12Z
dc.date.available2018-03-28T23:32:12Z
dc.identifierSpectrochimica Acta Part A-molecular And Biomolecular Spectroscopy. Pergamon-elsevier Science Ltd, v. 73, n. 1, n. 54, n. 60, 2009.
dc.identifier1386-1425
dc.identifierWOS:000265516400010
dc.identifier10.1016/j.saa.2009.01.018
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/72606
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/72606
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/72606
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1274503
dc.descriptionButoxylated silica nanoparticles (BSN) were prepared by esterification of the silanol groups of fumed silica nanoparticles with butanol and characterized by (13)C and (29)Si NMR and thermogravimetry. The molecular probes benzophenone (BP) and safranine-T were used to investigate the BSN suspensions in water: acetonitrile. Laser flash-photolysis experiments at lambda(exc)=266nm performed with BSN suspended in acetonitrile:aqueous phosphate buffer supported previous results of our group obtained by time-resolved phosphorescence experiments and showed that only free and adsorbed excited triplet states of BP and diphenylketyl radicals contribute to the signals. The UV-vis spectroscopic and photophysical properties of safranine-T are strongly solvent-dependent. Thus, the analysis of the emission spectra and fluorescence lifetimes yielded information on the localization of this probe molecule in suspensions of BSN and of the bare silica nanoparticles. The values of the equilibrium constant for the adsorption of the ground-state safranine-T on the particles were found to be (9.2 +/- 0.8) x 10(4), (7.2 +/- 0.8) x 10(5), and (3.0 +/- 0.1) X 10(4) for the BSN in 1: 1 acetonitrile:water, SiO(2) in 1:1 acetonitrile:water, and SiO(2) in acetonitrile, respectively. (C) 2009 Elsevier B.V. All rights reserved.
dc.description73
dc.description1
dc.description54
dc.description60
dc.descriptionAgencia Nacional de Promocion Cientifica y Tecnologica, (ANPCyT, Argentina). [14508]
dc.descriptionDAAD Alumni Program
dc.descriptionConsejo Nacional de investigaciones Cientificas y Tecnicas (CONICET, Argentina)
dc.descriptionComision de Investigaciones Cientificas de la Provincia de Buenos Aires (CICPBA, Argentina)
dc.descriptionAgencia Nacional de Promocion Cientifica y Tecnologica, (ANPCyT, Argentina). [14508]
dc.languageen
dc.publisherPergamon-elsevier Science Ltd
dc.publisherOxford
dc.publisherInglaterra
dc.relationSpectrochimica Acta Part A-molecular And Biomolecular Spectroscopy
dc.relationSpectroc. Acta Pt. A-Molec. Biomolec. Spectr.
dc.rightsfechado
dc.rightshttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dc.sourceWeb of Science
dc.subjectFunctionalized silica nanoparticles
dc.subjectLaser flash-photolysis
dc.subjectBenzophenone
dc.subjectH-abstraction
dc.subjectKetyl radical
dc.subjectSafranine-T
dc.subjectSingle photon counting
dc.subjectLaser Flash-photolysis
dc.subjectTriplet-state
dc.subjectSurface Photochemistry
dc.subjectBenzophenone
dc.subjectAdsorption
dc.subjectRadicals
dc.subjectKinetics
dc.subjectGel
dc.titleThe use of molecular probes for the characterization of dispersions of functionalized silica nanoparticles
dc.typeArtículos de revistas


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