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231224s2017 xx |||||o 00| ||eng c |
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|a 10.1021/acs.langmuir.6b04600
|2 doi
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|a pubmed24n0896.xml
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|a (NLM)28195489
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|a DE-627
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|e rakwb
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|a eng
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| 100 |
1 |
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|a Rupper, Patrick
|e verfasserin
|4 aut
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| 245 |
1 |
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|a Composition and Stability of Plasma Polymer Films Exhibiting Vertical Chemical Gradients
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|c 2017
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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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|2 rdacarrier
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|a Date Completed 11.05.2018
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|a Date Revised 11.05.2018
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a Controlling the balance between stability and functional group density in grown plasma polymer films is the key to diverse applications such as drug release, tissue-engineered implants, filtration, contact lenses, microfluidics, electrodes, sensors, etc. Highly functional plasma polymer films typically show a limited stability in air or aqueous environments due to mechanisms like molecular reorganization, oxidation, and hydrolysis. Stabilization is achieved by enhancing cross-linking at the cost of the terminal functional groups such as -OH and -COOH, but also -NH2, etc. To overcome such limitations, a structural and chemical gradient was introduced perpendicular to the surface plane; this vertical gradient structure is composed of a highly cross-linked base layer, gradually changing into a more functional nanoscaled surface termination layer. This was achieved using CO2/C2H4 discharges with decreasing power input and increasing gas ratio during plasma polymer deposition. The aging behavior and stability of such oxygen-functional vertical gradient nanostructures were studied in air and in different aqueous environments (acidic pH 4, neutral pH ≈ 6.2, and basic pH 10). Complementary characterization methods were used, including angle-resolved X-ray photoelectron spectroscopy (ARXPS) and time-of-flight secondary ion mass spectrometry (ToF-SIMS) as well as water contact angle (WCA) measurements. It was found that in air, the vertical gradient films are stabilized over a period of months. The same gradients also appear to be stable in neutral water over a period of at least 1 week. Changes in the oxygen depth profiles have been observed at pH 4 and pH 10 showing structural and chemical aging effects on different time scales. The use of vertical gradient plasma polymer nanofilms thus represents a novel approach providing enhanced stability, thus opening the possibility for new applications
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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1 |
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|a Vandenbossche, Marianne
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Bernard, Laetitia
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Hegemann, Dirk
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Heuberger, Manfred
|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 33(2017), 9 vom: 07. März, Seite 2340-2352
|w (DE-627)NLM098181009
|x 1520-5827
|7 nnns
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| 773 |
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|g volume:33
|g year:2017
|g number:9
|g day:07
|g month:03
|g pages:2340-2352
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|u http://dx.doi.org/10.1021/acs.langmuir.6b04600
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