Artículo
Daraio, M.E.; San Román, E. "Aggregation and photophysics of Rose Bengal in alumina-coated colloidal suspensions" (2001) Helvetica Chimica Acta. 84(9):2601-2614
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Abstract:
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.
Registro:
| Documento: | Artículo |
| Título: | Aggregation and photophysics of Rose Bengal in alumina-coated colloidal suspensions |
| Autor: | Daraio, M.E.; San Román, E. |
| Filiación: | INQUIMAE/Departamento de Quimica Inorganica, Analitica y Quimica Fisica, Facultad de Ciencias Exactas y Naturales, Ciudad Universitaria, 1428 Buenos Aires, Argentina Laboratorio de Química de Sistemas Heterogéneos, Departamento de Química, Universidad de Buenos Aires, Av. Paseo Colón 850, 1063 Buenos Aires, Argentina |
| Palabras clave: | Absorption; Agglomeration; Dimers; Fluorescence; Monomers; Positive ions; Silica; Photophysics; Suspensions (fluids); aluminum oxide; cation; dimer; nanoparticle; rose bengal; silicon dioxide; absorption; adsorption; aqueous solution; article; chemical structure; colloid; fluorescence; mathematical analysis; photochemistry |
| Año: | 2001 |
| Volumen: | 84 |
| Número: | 9 |
| Página de inicio: | 2601 |
| Página de fin: | 2614 |
| DOI: | http://dx.doi.org/10.1002/1522-2675(20010919)84:9<2601::AID-HLCA2601>3.0.CO;2-X |
| Título revista: | Helvetica Chimica Acta |
| Título revista abreviado: | Helv. Chim. Acta |
| ISSN: | 0018019X |
| CODEN: | HCACA |
| Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0018019X_v84_n9_p2601_Daraio |
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Citas:
---------- APA ----------
Daraio, M.E. & San Román, E. (2001) . Aggregation and photophysics of Rose Bengal in alumina-coated colloidal suspensions. Helvetica Chimica Acta, 84(9), 2601-2614.http://dx.doi.org/10.1002/1522-2675(20010919)84:9<2601::AID-HLCA2601>3.0.CO;2-X
---------- CHICAGO ----------
Daraio, M.E., San Román, E. "Aggregation and photophysics of Rose Bengal in alumina-coated colloidal suspensions" . Helvetica Chimica Acta 84, no. 9 (2001) : 2601-2614.http://dx.doi.org/10.1002/1522-2675(20010919)84:9<2601::AID-HLCA2601>3.0.CO;2-X
---------- MLA ----------
Daraio, M.E., San Román, E. "Aggregation and photophysics of Rose Bengal in alumina-coated colloidal suspensions" . Helvetica Chimica Acta, vol. 84, no. 9, 2001, pp. 2601-2614.http://dx.doi.org/10.1002/1522-2675(20010919)84:9<2601::AID-HLCA2601>3.0.CO;2-X
---------- VANCOUVER ----------
Daraio, M.E., San Román, E. Aggregation and photophysics of Rose Bengal in alumina-coated colloidal suspensions. Helv. Chim. Acta. 2001;84(9):2601-2614.http://dx.doi.org/10.1002/1522-2675(20010919)84:9<2601::AID-HLCA2601>3.0.CO;2-X
