Tuning the concentration of dye loaded polymer films for maximum photosensitization efficiency: Phloxine B in poly(2-hydroxyethyl methacrylate)

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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...

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Autores principales: Litman, Y., Rodríguez, H.B., San Román, E.
Formato: JOUR
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_1474905X_v15_n1_p80_Litman
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_1474905X_v15_n1_p80_Litman
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spelling todo:paper_1474905X_v15_n1_p80_Litman2023-10-03T16:18:19Z Tuning the concentration of dye loaded polymer films for maximum photosensitization efficiency: Phloxine B in poly(2-hydroxyethyl methacrylate) Litman, Y. Rodríguez, H.B. San Román, E. 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. Fil:Rodríguez, H.B. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:San Román, E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_1474905X_v15_n1_p80_Litman
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description 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.
format JOUR
author Litman, Y.
Rodríguez, H.B.
San Román, E.
spellingShingle 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)
author_facet Litman, Y.
Rodríguez, H.B.
San Román, E.
author_sort Litman, Y.
title Tuning the concentration of dye loaded polymer films for maximum photosensitization efficiency: Phloxine B in poly(2-hydroxyethyl methacrylate)
title_short Tuning the concentration of dye loaded polymer films for maximum photosensitization efficiency: Phloxine B in poly(2-hydroxyethyl methacrylate)
title_full Tuning the concentration of dye loaded polymer films for maximum photosensitization efficiency: Phloxine B in poly(2-hydroxyethyl methacrylate)
title_fullStr Tuning the concentration of dye loaded polymer films for maximum photosensitization efficiency: Phloxine B in poly(2-hydroxyethyl methacrylate)
title_full_unstemmed Tuning the concentration of dye loaded polymer films for maximum photosensitization efficiency: Phloxine B in poly(2-hydroxyethyl methacrylate)
title_sort tuning the concentration of dye loaded polymer films for maximum photosensitization efficiency: phloxine b in poly(2-hydroxyethyl methacrylate)
url http://hdl.handle.net/20.500.12110/paper_1474905X_v15_n1_p80_Litman
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AT sanromane tuningtheconcentrationofdyeloadedpolymerfilmsformaximumphotosensitizationefficiencyphloxinebinpoly2hydroxyethylmethacrylate
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