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231224s2011 xx |||||o 00| ||eng c |
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|a 10.1021/la2027779
|2 doi
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|e rakwb
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|a eng
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|a Rotella, Cinzia
|e verfasserin
|4 aut
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|a Adsorption kinetics of ultrathin polymer films in the melt probed by dielectric spectroscopy and second-harmonic generation
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|c 2011
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
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|2 rdamedia
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|a ƒa Online-Ressource
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|a Date Completed 06.03.2012
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|a Date Revised 08.11.2011
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a We studied the adsorption kinetics of supported ultrathin films of dye-labeled polystyrene (l-PS) by combining dielectric spectroscopy (DS) and the interface-specific nonlinear optical second harmonic generation (SHG) technique. While DS is sensitive to the fraction of mobile dye moieties (chromophores), the SHG signal probes their anisotropic orientation. Time-resolved measurements were performed above the glass transition temperature on two different sample geometries. In one configuration, the l-PS layer is placed in contact with the aluminum surface, while in the other one, the deposition is done on a strongly adsorbed layer of neat PS. From the time dependence of the dielectric strength and SHG signal of the l-PS layer in contact with the metal, we detected two different kinetics regimes. We interpret these regimes in terms of the interplay between adsorption and orientation of the adsorbing labeling moieties. At early times, dye moieties get adsorbed adopting an orientation parallel to the surface. When adsorption proceeds to completeness, the kinetics slows down and the dye moieties progressively orient normal to the surface. Conversely, when the layer of l-PS layer is deposited on the strongly adsorbed layer of neat PS, both the dielectric strength and the SHG signal do not show any variation with time. This means that no adsorption takes place
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Polymers
|2 NLM
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|a Napolitano, Simone
|e verfasserin
|4 aut
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|a Vandendriessche, Stefaan
|e verfasserin
|4 aut
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|a Valev, Ventsislav K
|e verfasserin
|4 aut
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|a Verbiest, Thierry
|e verfasserin
|4 aut
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|a Larkowska, Maria
|e verfasserin
|4 aut
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|a Kucharski, Stanislaw
|e verfasserin
|4 aut
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|a Wübbenhorst, Michael
|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 1992
|g 27(2011), 22 vom: 15. Nov., Seite 13533-8
|w (DE-627)NLM098181009
|x 1520-5827
|7 nnns
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| 773 |
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|g volume:27
|g year:2011
|g number:22
|g day:15
|g month:11
|g pages:13533-8
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|u http://dx.doi.org/10.1021/la2027779
|3 Volltext
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