Influence of the glass transition on rotational dynamics of dyes in thin polymer films: Single-molecule and ensemble experiments
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...
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todo:paper_10895639_v118_n45_p10309_Araoz2023-10-03T16:04:49Z Influence of the glass transition on rotational dynamics of dyes in thin polymer films: Single-molecule and ensemble experiments Araoz, B. Carattino, A. Tauber, D. Von Borczyskowski, C. Aramendia, P.F. 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 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. Fil:Araoz, B. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Aramendia, P.F. 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_10895639_v118_n45_p10309_Araoz |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
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 |
| spellingShingle |
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 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 |
| topic_facet |
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 |
| description |
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. |
| format |
JOUR |
| author |
Araoz, B. Carattino, A. Tauber, D. Von Borczyskowski, C. Aramendia, P.F. |
| author_facet |
Araoz, B. Carattino, A. Tauber, D. Von Borczyskowski, C. Aramendia, P.F. |
| author_sort |
Araoz, B. |
| title |
Influence of the glass transition on rotational dynamics of dyes in thin polymer films: Single-molecule and ensemble experiments |
| title_short |
Influence of the glass transition on rotational dynamics of dyes in thin polymer films: Single-molecule and ensemble experiments |
| title_full |
Influence of the glass transition on rotational dynamics of dyes in thin polymer films: Single-molecule and ensemble experiments |
| title_fullStr |
Influence of the glass transition on rotational dynamics of dyes in thin polymer films: Single-molecule and ensemble experiments |
| title_full_unstemmed |
Influence of the glass transition on rotational dynamics of dyes in thin polymer films: Single-molecule and ensemble experiments |
| title_sort |
influence of the glass transition on rotational dynamics of dyes in thin polymer films: single-molecule and ensemble experiments |
| url |
http://hdl.handle.net/20.500.12110/paper_10895639_v118_n45_p10309_Araoz |
| work_keys_str_mv |
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