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

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...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: Rodríguez, Hernán Bernardo, San Roman, Enrique Arnoldo
Publicado: 2016
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_1474905X_v15_n1_p80_Litman
http://hdl.handle.net/20.500.12110/paper_1474905X_v15_n1_p80_Litman
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_1474905X_v15_n1_p80_Litman
record_format dspace
spelling paper:paper_1474905X_v15_n1_p80_Litman2023-06-08T16:17:41Z Tuning the concentration of dye loaded polymer films for maximum photosensitization efficiency: Phloxine B in poly(2-hydroxyethyl methacrylate) Rodríguez, Hernán Bernardo San Roman, Enrique Arnoldo 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. 2016 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_1474905X_v15_n1_p80_Litman 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.
author Rodríguez, Hernán Bernardo
San Roman, Enrique Arnoldo
spellingShingle Rodríguez, Hernán Bernardo
San Roman, Enrique Arnoldo
Tuning the concentration of dye loaded polymer films for maximum photosensitization efficiency: Phloxine B in poly(2-hydroxyethyl methacrylate)
author_facet Rodríguez, Hernán Bernardo
San Roman, Enrique Arnoldo
author_sort Rodríguez, Hernán Bernardo
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)
publishDate 2016
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_1474905X_v15_n1_p80_Litman
http://hdl.handle.net/20.500.12110/paper_1474905X_v15_n1_p80_Litman
work_keys_str_mv AT rodriguezhernanbernardo tuningtheconcentrationofdyeloadedpolymerfilmsformaximumphotosensitizationefficiencyphloxinebinpoly2hydroxyethylmethacrylate
AT sanromanenriquearnoldo tuningtheconcentrationofdyeloadedpolymerfilmsformaximumphotosensitizationefficiencyphloxinebinpoly2hydroxyethylmethacrylate
_version_ 1768543482790543360

Ejemplares similares