Optical characterization of co-nonsolvency effects in thin responsive PNIPAAm-based gel layers exposed to ethanol/water mixtures

Ilke Anac, Alena Aulasevich, Matthias J N Junk, Piotr Jakubowicz, Robert F Roskamp, Bernhard Menges, Ulrich Jonas, Wolfgang Knoll

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Abstract

Surface-attached, photo-crosslinked gel films of a N-isopropylacrylamide copolymer were investigated in ethanol/water mixtures using a combination of surface plasmon resonance/ optical waveguide spectroscopy with reversed WKB analysis. The solvent quality of the pure good solvents drops in their mixture and this co- nonsolvency effect shifts the transition temperature (T c) in the μm-thin gel films from 32.8 °Cin pure water to 29.7 °C with only 0.25 vol.-% etha- nol. Between 20 and 70% ethanol and >10 °C (the practical temperature limit) the layers existed only in the collapsed state. A reentrant Tc of 40.2 °C was found at 70% ethanol while at higher ethanol volume fraction no Tc could be recorded.
LanguageEnglish
Pages1018-1025
Number of pages8
JournalMacromolecular Chemistry and Physics
Volume211
Issue number9
DOIs
StatusPublished - 3 May 2010

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Ethanol
ethyl alcohol
Gels
gels
Water
water
Surface plasmon resonance
Optical waveguides
surface plasmon resonance
optical waveguides
Superconducting transition temperature
Volume fraction
copolymers
Copolymers
transition temperature
poly-N-isopropylacrylamide
Spectroscopy
shift
spectroscopy
Temperature

Cite this

Anac, I., Aulasevich, A., Junk, M. J. N., Jakubowicz, P., Roskamp, R. F., Menges, B., ... Knoll, W. (2010). Optical characterization of co-nonsolvency effects in thin responsive PNIPAAm-based gel layers exposed to ethanol/water mixtures. DOI: 10.1002/macp.200900533

Optical characterization of co-nonsolvency effects in thin responsive PNIPAAm-based gel layers exposed to ethanol/water mixtures. / Anac, Ilke; Aulasevich, Alena; Junk, Matthias J N; Jakubowicz, Piotr; Roskamp, Robert F; Menges, Bernhard; Jonas, Ulrich; Knoll, Wolfgang.

In: Macromolecular Chemistry and Physics, Vol. 211, No. 9, 03.05.2010, p. 1018-1025.

Research output: Contribution to journalArticle

Anac, I, Aulasevich, A, Junk, MJN, Jakubowicz, P, Roskamp, RF, Menges, B, Jonas, U & Knoll, W 2010, 'Optical characterization of co-nonsolvency effects in thin responsive PNIPAAm-based gel layers exposed to ethanol/water mixtures' Macromolecular Chemistry and Physics, vol. 211, no. 9, pp. 1018-1025. DOI: 10.1002/macp.200900533
Anac I, Aulasevich A, Junk MJN, Jakubowicz P, Roskamp RF, Menges B et al. Optical characterization of co-nonsolvency effects in thin responsive PNIPAAm-based gel layers exposed to ethanol/water mixtures. Macromolecular Chemistry and Physics. 2010 May 3;211(9):1018-1025. Available from, DOI: 10.1002/macp.200900533
Anac, Ilke ; Aulasevich, Alena ; Junk, Matthias J N ; Jakubowicz, Piotr ; Roskamp, Robert F ; Menges, Bernhard ; Jonas, Ulrich ; Knoll, Wolfgang. / Optical characterization of co-nonsolvency effects in thin responsive PNIPAAm-based gel layers exposed to ethanol/water mixtures. In: Macromolecular Chemistry and Physics. 2010 ; Vol. 211, No. 9. pp. 1018-1025
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