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231223s2008 xx |||||o 00| ||eng c |
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|a 10.1021/la802496h
|2 doi
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|a pubmed25n0608.xml
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|a eng
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1 |
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|a Lane, Thomas J
|e verfasserin
|4 aut
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|a Dual-beam polarization interferometry resolves mechanistic aspects of polyelectrolyte adsorption
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|c 2008
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
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|a ƒa Online-Ressource
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|a Date Completed 28.10.2008
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|a Date Revised 01.10.2008
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a The electrostatically driven binding dynamics of a polyelectrolyte multilayer (PEMU) film was investigated in real-time using dual-beam polarization interferometry (DPI) and independently supported by quartz crystal microbalance with dissipation monitoring (QCM-D) studies. Multilayer assemblies of the polyanions poly[1-[4[(3-carboxy-4-hydroxyphenylazo)benzenesulfonamido]-1,2-ethanediyl sodium salt] (PAZO) and poly(styrene sulfonate) (PSS) were respectively constructed with the polycation poly(ethylenimine) (PEI) on anionic functionalized substrates using the layer-by-layer electrostatic self-assembly method. DPI measurements indicate that polyelectrolyte adsorption occurs in three distinct stages. In the first stage, for approximately 5 s, coil-like segments of polyanion partially tether to the surface of the oppositely charged PEI. In the second stage, these coils unfurl over a period of approximately 10 s to cover the surface resulting in an increase in average density of the film. During the final adsorption step, the surface-bound polyelectrolyte diffuses into the multilayer assembly, exposing the surface to further deposition. This last step occurs over a much longer time period and results in a highly interpenetrated film containing a charge-overcompensated region at the film surface
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|a Journal Article
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|a Fletcher, Will R
|e verfasserin
|4 aut
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|a Gormally, Michael V
|e verfasserin
|4 aut
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|a Johal, Malkiat S
|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 1985
|g 24(2008), 19 vom: 07. Okt., Seite 10633-6
|w (DE-627)NLM098181009
|x 1520-5827
|7 nnas
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| 773 |
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|g volume:24
|g year:2008
|g number:19
|g day:07
|g month:10
|g pages:10633-6
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|u http://dx.doi.org/10.1021/la802496h
|3 Volltext
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