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231223s2009 xx |||||o 00| ||eng c |
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|a 10.1021/la900573w
|2 doi
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|a pubmed24n0630.xml
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|a eng
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1 |
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|a Carr, Joshua K
|e verfasserin
|4 aut
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|a Heterogeneous translational dynamics of rhodamine B in polyelectrolyte multilayer thin films observed by single molecule microscopy
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|c 2009
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
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|2 rdacarrier
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|a Date Completed 17.09.2009
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|a Date Revised 14.07.2009
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|a published: Print
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|a Citation Status PubMed-not-MEDLINE
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|a The lateral diffusion dynamics of rhodamine B (RB) in polyelectrolyte multilayer (PEM) thin films has been studied with single-molecule confocal fluorescence microscopy. The films were made with sodium poly(sodium 4-styrenesulfonate) (PSS) and poly(diallydimethlyammonium chloride) (PDDA). Analysis of the real-time emission intensity traces reveals three diverse components of translational motion: (1) fast diffusion of RB through the confocal detection volume; (2) reversible tracer adsorption processes; and (3) nanoconfined diffusion. These processes cover a wide range of time scales. Analysis via fluorescence correlation spectroscopy (FCS) involves multicomponent fitting of the autocorrelated emission data. The model includes a free Brownian diffusion parameter, D, and two rate constants of desorption, k(-1) and k(-2). For RB in a PSS/PDDA thin film made with 0.01 M NaCl in the polyelectrolyte buildup solutions, D = 1.7 x 10(-7) cm(2)/s, k(-1) = 30 s(-1), and k(-2) = 0.1 s(-1). FCS was also performed on RB/PEM samples made with NaCl concentrations of the buildup solutions ranging from 0.01 to 0.7 M. A weak dependence of D and k(-1) on NaCl concentration was observed while k(-2) increased linearly with [NaCl]
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|a Journal Article
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1 |
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|a Himes, Ryan D
|e verfasserin
|4 aut
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|a Keung, Connie H
|e verfasserin
|4 aut
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|a Burden, Daniel L
|e verfasserin
|4 aut
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|a Walhout, Peter K
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1999
|g 25(2009), 14 vom: 21. Juli, Seite 8330-9
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|x 1520-5827
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| 773 |
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|g volume:25
|g year:2009
|g number:14
|g day:21
|g month:07
|g pages:8330-9
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| 856 |
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|u http://dx.doi.org/10.1021/la900573w
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