Artículo
Tuning the concentration of dye loaded polymer films for maximum photosensitization efficiency: Phloxine B in poly(2-hydroxyethyl methacrylate)
Fecha de publicación:
01/2016
Editorial:
Royal Society of Chemistry
Revista:
Photochemical and Photobiological Sciences
ISSN:
1474-905X
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
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.
Palabras clave:
Polymer Films
,
Phloxine B
,
Photophysics
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Articulos(INIFTA)
Articulos de INST.DE INV.FISICOQUIMICAS TEORICAS Y APLIC.
Articulos de INST.DE INV.FISICOQUIMICAS TEORICAS Y APLIC.
Articulos(INQUIMAE)
Articulos de INST.D/QUIM FIS D/L MATERIALES MEDIOAMB Y ENERGIA
Articulos de INST.D/QUIM FIS D/L MATERIALES MEDIOAMB Y ENERGIA
Citación
Litman, Yair Ezequiel; Rodriguez, Hernan Bernardo; San Roman, Enrique Arnoldo; Tuning the concentration of dye loaded polymer films for maximum photosensitization efficiency: Phloxine B in poly(2-hydroxyethyl methacrylate); Royal Society of Chemistry; Photochemical and Photobiological Sciences; 15; 1; 1-2016; 80-85
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