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Abstract:

We performed polarized fluorescence emission studies of Nile Red (NR) in poly(methyl methacrylate) (PMMA), poly(ethyl methacrylate) (PEMA), and poly(butyl methacrylate) (PBMA) at the single molecule (SM) and at the ensemble level to study the in cage movements of the ground-state molecule in polymer films of nanometric thickness at room temperature. Experiments were performed with wide field irradiation. At the ensemble level, the linearly polarized irradiation was used to induce a photoselection by bleaching, which is compensated by rotational diffusion. Both results show an appreciable difference in mobility of NR in the films that is correlated with the different glass-transition temperatures of the films, particularly in PEMA, which displays a clearly distinct behavior between the 200 nm films, representing a rigid environment, and the 25 nm ones, showing much higher mobility. We developed a model of broad application for polarized photobleaching that allows obtaining rotational diffusion coefficients and photobleaching quantum yields in an easy way from ensemble experiments. The parameters obtained from ensemble measurements correlate well with the results from SM experiments. © 2014 American Chemical Society.

Registro:

Documento: Artículo
Título:Influence of the glass transition on rotational dynamics of dyes in thin polymer films: Single-molecule and ensemble experiments
Autor:Araoz, B.; Carattino, A.; Tauber, D.; Von Borczyskowski, C.; Aramendia, P.F.
Filiación:INQUIMAE, Dept. Química Inorgánica Analítica y Química Física, Universidad de Buenos Aires, Pabellon 2, Ciudad Universitaria, Ciudad de Buenos Aires, C1428EHA, Argentina
Institute of Physics and Nano MA, Technische Universität Chemnitz, Chemnitz, 09107, Germany
Centro de Investigaciones en Bionanociencias, CIBION-CONICET, Godoy Cruz 2390, Ciudad de Buenos Aires, 1425, Argentina
Dept. Química Inorganica Analítica y Química Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellon 2, Ciudad Universitaria, Ciudad de Buenos Aires, C1428EHA, Argentina
Leiden Institute of Physics, Leiden University, Niels Bohrweg 2, CA Leiden, 2333, Netherlands
Palabras clave:Diffusion; Diffusion in solids; Esters; Glass; Glass transition; Ground state; Irradiation; Molecules; Photobleaching; Polymethyl methacrylates; Semiconducting films; Ground-state molecules; Polarized fluorescence; Poly(ethyl methacrylate); Poly(methyl methacrylate) (PMMA); Polybutylmethacrylate; Rotational diffusion; Rotational diffusion coefficients; Rotational dynamics; Polymer films
Año:2014
Volumen:118
Número:45
Página de inicio:10309
Página de fin:10317
DOI: http://dx.doi.org/10.1021/jp500272y
Título revista:Journal of Physical Chemistry A
Título revista abreviado:J Phys Chem A
ISSN:10895639
CODEN:JPCAF
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10895639_v118_n45_p10309_Araoz

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Citas:

---------- APA ----------
Araoz, B., Carattino, A., Tauber, D., Von Borczyskowski, C. & Aramendia, P.F. (2014) . Influence of the glass transition on rotational dynamics of dyes in thin polymer films: Single-molecule and ensemble experiments. Journal of Physical Chemistry A, 118(45), 10309-10317.
http://dx.doi.org/10.1021/jp500272y
---------- CHICAGO ----------
Araoz, B., Carattino, A., Tauber, D., Von Borczyskowski, C., Aramendia, P.F. "Influence of the glass transition on rotational dynamics of dyes in thin polymer films: Single-molecule and ensemble experiments" . Journal of Physical Chemistry A 118, no. 45 (2014) : 10309-10317.
http://dx.doi.org/10.1021/jp500272y
---------- MLA ----------
Araoz, B., Carattino, A., Tauber, D., Von Borczyskowski, C., Aramendia, P.F. "Influence of the glass transition on rotational dynamics of dyes in thin polymer films: Single-molecule and ensemble experiments" . Journal of Physical Chemistry A, vol. 118, no. 45, 2014, pp. 10309-10317.
http://dx.doi.org/10.1021/jp500272y
---------- VANCOUVER ----------
Araoz, B., Carattino, A., Tauber, D., Von Borczyskowski, C., Aramendia, P.F. Influence of the glass transition on rotational dynamics of dyes in thin polymer films: Single-molecule and ensemble experiments. J Phys Chem A. 2014;118(45):10309-10317.
http://dx.doi.org/10.1021/jp500272y