dc.creator | Arce, VB | |
dc.creator | Bertolotti, SG | |
dc.creator | Oliveira, FJVE | |
dc.creator | Airoldi, C | |
dc.creator | Gonzalez, MC | |
dc.creator | Allegretti, PE | |
dc.creator | Martire, DO | |
dc.date | 2009 | |
dc.date | JUL | |
dc.date | 2014-11-17T20:37:00Z | |
dc.date | 2015-11-26T16:46:22Z | |
dc.date | 2014-11-17T20:37:00Z | |
dc.date | 2015-11-26T16:46:22Z | |
dc.date.accessioned | 2018-03-28T23:32:12Z | |
dc.date.available | 2018-03-28T23:32:12Z | |
dc.identifier | Spectrochimica Acta Part A-molecular And Biomolecular Spectroscopy. Pergamon-elsevier Science Ltd, v. 73, n. 1, n. 54, n. 60, 2009. | |
dc.identifier | 1386-1425 | |
dc.identifier | WOS:000265516400010 | |
dc.identifier | 10.1016/j.saa.2009.01.018 | |
dc.identifier | http://www.repositorio.unicamp.br/jspui/handle/REPOSIP/72606 | |
dc.identifier | http://www.repositorio.unicamp.br/handle/REPOSIP/72606 | |
dc.identifier | http://repositorio.unicamp.br/jspui/handle/REPOSIP/72606 | |
dc.identifier.uri | http://repositorioslatinoamericanos.uchile.cl/handle/2250/1274503 | |
dc.description | Butoxylated 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.description | 73 | |
dc.description | 1 | |
dc.description | 54 | |
dc.description | 60 | |
dc.description | Agencia Nacional de Promocion Cientifica y Tecnologica, (ANPCyT, Argentina). [14508] | |
dc.description | DAAD Alumni Program | |
dc.description | Consejo Nacional de investigaciones Cientificas y Tecnicas (CONICET, Argentina) | |
dc.description | Comision de Investigaciones Cientificas de la Provincia de Buenos Aires (CICPBA, Argentina) | |
dc.description | Agencia Nacional de Promocion Cientifica y Tecnologica, (ANPCyT, Argentina). [14508] | |
dc.language | en | |
dc.publisher | Pergamon-elsevier Science Ltd | |
dc.publisher | Oxford | |
dc.publisher | Inglaterra | |
dc.relation | Spectrochimica Acta Part A-molecular And Biomolecular Spectroscopy | |
dc.relation | Spectroc. Acta Pt. A-Molec. Biomolec. Spectr. | |
dc.rights | fechado | |
dc.rights | http://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy | |
dc.source | Web of Science | |
dc.subject | Functionalized silica nanoparticles | |
dc.subject | Laser flash-photolysis | |
dc.subject | Benzophenone | |
dc.subject | H-abstraction | |
dc.subject | Ketyl radical | |
dc.subject | Safranine-T | |
dc.subject | Single photon counting | |
dc.subject | Laser Flash-photolysis | |
dc.subject | Triplet-state | |
dc.subject | Surface Photochemistry | |
dc.subject | Benzophenone | |
dc.subject | Adsorption | |
dc.subject | Radicals | |
dc.subject | Kinetics | |
dc.subject | Gel | |
dc.title | The use of molecular probes for the characterization of dispersions of functionalized silica nanoparticles | |
dc.type | Artículos de revistas | |