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Surface-confined ph...
Surface-confined photopolymerization of pH-responsive acrylamide/acrylate brushes on polymer thin films
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- Dunér, Gunnar (författare)
- KTH,Kemi,Department of Chemistry, KTH
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- Anderson, Henrik (författare)
- Uppsala universitet,Fasta tillståndets elektronik,Thin Films Group
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- Myrskog, Annica, 1980- (författare)
- Linköpings universitet,Tekniska högskolan,Sensorvetenskap och Molekylfysik
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- Hedlund, Maria (författare)
- Uppsala universitet,Institutionen för fysik och materialvetenskap
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- Aastrup, Teodor (författare)
- KTH,Kemi,Attana AB
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- Ramström, Olof (författare)
- KTH,Organisk kemi,Department of Chemistry, KTH
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(creator_code:org_t)
- 2008-06-19
- 2008
- Engelska.
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Ingår i: Langmuir. - : American Chemical Society (ACS). - 0743-7463 .- 1520-5827. ; 24:14, s. 7559-7564
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- Dynamic acrylamide/acrylate polymeric brushes were synthesized at gold-plated quartz crystal surfaces. The crystals were initially coated with polystyrene-type thin films, derivatized with photolabile iniferter groups, and subsequently subjected to photoinitiated polymerization in acrylamide/acrylate monomer feeds. This surface-confined polymerization method enabled direct photocontrol over the polymerization, as followed by increased frequency responses of the crystal oscillations in a quartz crystal microbalance (QCM). The produced polymer layers were also found to be highly sensitive to external acid/base stimuli. Large oscillation frequency shifts were detected when the brushes were exposed to buffer solutions of different pH. The dynamic behavior of the resulting polymeric brushes was evaluated, and the extent of expansion and contraction of the films was monitored by the QCM setup in situ in real time. The resulting responses were rapid, and the effects were fully reversible. Low pH resulted in full contractions of the films, whereas higher pH yielded maximal expansion in order to minimize repulsion around the charged acrylate centers. The surfaces also proved to be very robust because the responsiveness was reproducible over many cycles of repeated expansion and contraction. Using ellipsometry, copolymer layers were estimated to be similar to 220 nm in a collapsed state and similar to 340 nm in the expanded state, effectively increasing the thickness of the film by 55%.
Ämnesord
- NATURVETENSKAP -- Kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences (hsv//eng)
- NATURVETENSKAP -- Kemi -- Polymerkemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Polymer Chemistry (hsv//eng)
- NATURVETENSKAP -- Kemi -- Fysikalisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Physical Chemistry (hsv//eng)
Nyckelord
- Bioelectric phenomena
- Brushes
- Chemical reactions
- Crystallography
- Frequency response
- Gold
- Molecular beam epitaxy
- Monomers
- Oxide minerals
- Photopolymerization
- Polyethylenes
- Polymerization
- Polymers
- Powders
- Quartz
- Quartz crystal microbalances
- Shrinkage
- Thick films
- Thin films
- Chemistry
- Kemi
- Polymer chemistry
- Surface and colloid chemistry
- Ytbioteknik
- NATURAL SCIENCES
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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