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231224s2013 xx |||||o 00| ||eng c |
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|a 10.1021/la402168z
|2 doi
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|a pubmed24n0770.xml
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|a (DE-627)NLM231098294
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|a (NLM)24059827
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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|a Sterner, Olof
|e verfasserin
|4 aut
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|a Photochemically prepared, two-component polymer-concentration gradients
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|c 2013
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|a Text
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|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
|b cr
|2 rdacarrier
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|a Date Completed 06.06.2014
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|a Date Revised 16.11.2017
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a A versatile, photochemical surface-modification approach using nitrene-insertion reactions has been employed to develop an ultrathin, two-component, polymer-gradient coating. Perfluorophenyl azide (PFPA) acted as the photosensitive moiety, forming a nitrene radical upon 254 nm UV exposure. Cationic poly(allyl amine) was grafted with PFPA and surface-anchored onto silicon wafers by means of electrostatic self-assembly. After spin-coating of polystyrene (PS), the substrate was illuminated from behind a moving shutter, thereby controlling the azide-to-nitrene conversion degree across the substrate, and leading to a gradually varying PS density after rinsing. Backfilling with poly(vinyl pyrrolidone) (PVP) and re-exposing to UV light formed a two-component polymer-density gradient. The composition varied linearly following exposure to a linear UV exposure profile, as determined with spectroscopic ellipsometry (ELM) and X-ray photoelectron spectroscopy (XPS). High-spatial-resolution, time-of-flight secondary ion mass spectrometry (ToF-SIMS) revealed a high degree of mixing between the two incompatible polymers on the micrometer scale. The dynamic water-contact angle (dCA) was found to depend strongly on the sample history, suggesting adaptive properties of the coating, which was further confirmed by angle-resolved XPS (ARXPS). To confirm the applicability of the system for biological investigations, gradients were exposed to zoospores of the macrofouling alga Ulva linza , and a critical PS composition of 70% was identified, above which settlement started to increase. It has been shown that a two-component polymer-density gradient can provide a high-throughput platform for determining critical surface properties of polymer blend materials
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Azides
|2 NLM
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|a Hydrocarbons, Fluorinated
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|a Polyamines
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|a Polystyrenes
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|a perfluorophenyl azide
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|a polyallylamine
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|a 30551-89-4
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|a Povidone
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|a FZ989GH94E
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|a Silicon
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|a Z4152N8IUI
|2 NLM
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|a Serrano, Ângela
|e verfasserin
|4 aut
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|a Mieszkin, Sophie
|e verfasserin
|4 aut
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|a Zürcher, Stefan
|e verfasserin
|4 aut
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|a Tosatti, Samuele
|e verfasserin
|4 aut
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|a Callow, Maureen E
|e verfasserin
|4 aut
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|a Callow, James A
|e verfasserin
|4 aut
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|a Spencer, Nicholas D
|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 29(2013), 42 vom: 22. Okt., Seite 13031-41
|w (DE-627)NLM098181009
|x 1520-5827
|7 nnns
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| 773 |
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|g volume:29
|g year:2013
|g number:42
|g day:22
|g month:10
|g pages:13031-41
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|u http://dx.doi.org/10.1021/la402168z
|3 Volltext
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|h 13031-41
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