Generation of Chemisorbed Benzyl Radicals on Silica Nanoparticles

dc.creatorArce, VB
dc.creatorRosso, JA
dc.creatorOliveira, FJVE
dc.creatorAiroldi, C
dc.creatorSoria, DB
dc.creatorGonzalez, MC
dc.creatorAllegretti, PE
dc.creatorMartire, DO
dc.date2010
dc.dateNOV-DEC
dc.date2014-11-13T18:49:56Z
dc.date2015-11-26T16:01:59Z
dc.date2014-11-13T18:49:56Z
dc.date2015-11-26T16:01:59Z
dc.date.accessioned2018-03-28T22:51:27Z
dc.date.available2018-03-28T22:51:27Z
dc.identifierPhotochemistry And Photobiology. Wiley-blackwell, v. 86, n. 6, n. 1208, n. 1214, 2010.
dc.identifier0031-8655
dc.identifierWOS:000284429500007
dc.identifier10.1111/j.1751-1097.2010.00810.x
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/67879
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/67879
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/67879
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1264961
dc.descriptionFunctionalized silica nanoparticles (NP) were obtained by esterification of the silanol groups of fumed silica nanoparticles with benzyl alcohol. These particles were characterized by Fourier transform infrared spectroscopy, 13C and 29Si NMR spectroscopy, thermogravimetry, total organic carbon, Brunauer-Emmett-Teller analysis, UV-visible spectroscopy, and transmission electron microscopy. NP suspensions in water/acetonitrile mixtures were used as quenchers of benzophenone (BP) phosphorescence in time-resolved experiments at the excitation wavelength of 266 nm. The phosphorescence signals obtained in the presence of the nanoparticles were fitted to biexponential decays. Both decays were accelerated in the presence of increasing amounts of NP. A model, including the reversible adsorption of BP on the NP, which was supported by computer simulations accounts for the observed results. Laser flash-photolysis experiments with excitation at 266 nm of NP suspensions in water/acetonitrile in the presence of BP generated benzyl radicals that were attached to the silica surface. These radicals were detected at their absorption maxima (320 nm) by transient optical techniques.
dc.description86
dc.description6
dc.description1208
dc.description1214
dc.descriptionANPCyT, Argentina [PICT 2007 00308, PICT 2008 00686]
dc.descriptionANPCyT
dc.descriptionANPCyT, Argentina [PICT 2007 00308, PICT 2008 00686]
dc.languageen
dc.publisherWiley-blackwell
dc.publisherHoboken
dc.publisherEUA
dc.relationPhotochemistry And Photobiology
dc.relationPhotochem. Photobiol.
dc.rightsfechado
dc.rightshttp://olabout.wiley.com/WileyCDA/Section/id-406071.html
dc.sourceWeb of Science
dc.subjectAl Binary Oxides
dc.subjectHydrogen Abstraction
dc.subjectSurface
dc.subjectBenzophenone
dc.subjectKinetics
dc.subjectGel
dc.subjectImmobilization
dc.subjectDispersions
dc.subjectTemperature
dc.subjectAdsorption
dc.titleGeneration of Chemisorbed Benzyl Radicals on Silica Nanoparticles
dc.typeArtículos de revistas


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