Aggregation and photophysics of Rose Bengal in alumina-coated colloidal suspensions

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The absorption and emission properties of Rose Bengal (RB) have been studied in colloidal suspensions of positively charged alumina-coated silica nanoparticles (Sil). Experimental spectra can be rationalized by the existence of an equilibrium between aqueous monomers and only one adsorbed species. H...

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Detalles Bibliográficos
Autor principal: Daraio, Marta Edit
Otros Autores: San Román, E.
Formato: Capítulo de libro
Lenguaje:Inglés
Publicado: 2001
Acceso en línea:Registro en Scopus
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Registro en la Biblioteca Digital
Aporte de:Registro referencial: Solicitar el recurso aquí
Biblioteca Central Dr. Luis F. Leloir (FCEN) de Universidad de Buenos Aires
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100 1 |a Daraio, Marta Edit 
245 1 0 |a Aggregation and photophysics of Rose Bengal in alumina-coated colloidal suspensions 
260 |c 2001 
270 1 0 |m San Román, E.; INQUIMAE/Dept. Quimica Inorganica, Fac. de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, 1428 Buenos Aires, Argentina; email: esr@qi.fcen.uba.ar 
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506 |2 openaire  |e Política editorial 
520 3 |a The absorption and emission properties of Rose Bengal (RB) have been studied in colloidal suspensions of positively charged alumina-coated silica nanoparticles (Sil). Experimental spectra can be rationalized by the existence of an equilibrium between aqueous monomers and only one adsorbed species. However, a simple partition or a Langmuir-type adsorption-aggregation equilibrium do not explain the observed results. No evidence regarding the existence of adsorbed monomers is found even at low surface coverage. Aggregation stops at the dimer level, though, at high enough dye concentrations, the surface coverage is almost complete. Comparative experiments performed on negatively charged silica nanoparticles show that monomers are the only species present in this case. Fluorescence experiments on Sil indicate that dimers are fluorescent. Laser excitation of adsorbed dye leads to the formation of RB radical cations, while the dye triplet state is not observed.  |l eng 
593 |a INQUIMAE/Departamento de Quimica Inorganica, Analitica y Quimica Fisica, Facultad de Ciencias Exactas y Naturales, Ciudad Universitaria, 1428 Buenos Aires, Argentina 
593 |a Laboratorio de Química de Sistemas Heterogéneos, Departamento de Química, Universidad de Buenos Aires, Av. Paseo Colón 850, 1063 Buenos Aires, Argentina 
690 1 0 |a ABSORPTION 
690 1 0 |a AGGLOMERATION 
690 1 0 |a DIMERS 
690 1 0 |a FLUORESCENCE 
690 1 0 |a MONOMERS 
690 1 0 |a POSITIVE IONS 
690 1 0 |a SILICA 
690 1 0 |a PHOTOPHYSICS 
690 1 0 |a SUSPENSIONS (FLUIDS) 
690 1 0 |a ALUMINUM OXIDE 
690 1 0 |a CATION 
690 1 0 |a DIMER 
690 1 0 |a NANOPARTICLE 
690 1 0 |a ROSE BENGAL 
690 1 0 |a SILICON DIOXIDE 
690 1 0 |a ABSORPTION 
690 1 0 |a ADSORPTION 
690 1 0 |a AQUEOUS SOLUTION 
690 1 0 |a ARTICLE 
690 1 0 |a CHEMICAL STRUCTURE 
690 1 0 |a COLLOID 
690 1 0 |a FLUORESCENCE 
690 1 0 |a MATHEMATICAL ANALYSIS 
690 1 0 |a PHOTOCHEMISTRY 
700 1 |a San Román, E. 
773 0 |d 2001  |g v. 84  |h pp. 2601-2614  |k n. 9  |p Helv. Chim. Acta  |x 0018019X  |w (AR-BaUEN)CENRE-1771  |t Helvetica Chimica Acta 
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