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Abstract:

Fluorescence and singlet molecular oxygen (1O2) quantum yields for phloxine B loaded poly(2-hydroxyethyl methacrylate) thin films are determined at dye concentrations from 0.015 to 22 wt%. Fluorescence self-quenching and the fall off of the 1O2 quantum yield observed above 0.1 wt% are attributed to very weakly interacting close-lying dye molecules acting as energy traps arising from molecular confinement. The maximum singlet oxygen generation efficiency (quantum yield × absorption factor) lies at concentrations around 2 wt%, where fluorescence self quenching amounts to more than 80%. Data are fitted quantitatively by using a quenching radius model involving energy migration and trapping with rQ = 1.2 nm. The present results constitute a proof of concept for the rational design of heterogeneous photosensitizers in general and, particularly, for applications in which the antimicrobial activity of singlet oxygen is central. © 2016 The Royal Society of Chemistry and Owner Societies.

Registro:

Documento: Artículo
Título:Tuning the concentration of dye loaded polymer films for maximum photosensitization efficiency: Phloxine B in poly(2-hydroxyethyl methacrylate)
Autor:Litman, Y.; Rodríguez, H.B.; San Román, E.
Filiación:INQUIMAE (UBA-CONICET)/DQIAyQF, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires Ciudad Universitaria Pab. II, Buenos Aires, Argentina
INIFTA (UNLP-CONICET), Facultad de Ciencias Exactas, Universidad Nacional de la Plata, Diag. 113 y Calle 64, La Plata, Argentina
Año:2016
Volumen:15
Número:1
Página de inicio:80
Página de fin:85
DOI: http://dx.doi.org/10.1039/c5pp00360a
Título revista:Photochemical and Photobiological Sciences
Título revista abreviado:Photochem. Photobiol. Sci.
ISSN:1474905X
CODEN:PPSHC
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_1474905X_v15_n1_p80_Litman

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Citas:

---------- APA ----------
Litman, Y., Rodríguez, H.B. & San Román, E. (2016) . Tuning the concentration of dye loaded polymer films for maximum photosensitization efficiency: Phloxine B in poly(2-hydroxyethyl methacrylate). Photochemical and Photobiological Sciences, 15(1), 80-85.
http://dx.doi.org/10.1039/c5pp00360a
---------- CHICAGO ----------
Litman, Y., Rodríguez, H.B., San Román, E. "Tuning the concentration of dye loaded polymer films for maximum photosensitization efficiency: Phloxine B in poly(2-hydroxyethyl methacrylate)" . Photochemical and Photobiological Sciences 15, no. 1 (2016) : 80-85.
http://dx.doi.org/10.1039/c5pp00360a
---------- MLA ----------
Litman, Y., Rodríguez, H.B., San Román, E. "Tuning the concentration of dye loaded polymer films for maximum photosensitization efficiency: Phloxine B in poly(2-hydroxyethyl methacrylate)" . Photochemical and Photobiological Sciences, vol. 15, no. 1, 2016, pp. 80-85.
http://dx.doi.org/10.1039/c5pp00360a
---------- VANCOUVER ----------
Litman, Y., Rodríguez, H.B., San Román, E. Tuning the concentration of dye loaded polymer films for maximum photosensitization efficiency: Phloxine B in poly(2-hydroxyethyl methacrylate). Photochem. Photobiol. Sci. 2016;15(1):80-85.
http://dx.doi.org/10.1039/c5pp00360a