Title: Phase Transition of pNIPAM Grafted on Plasma-Activated PEO Monitored in-Situ by Quartz Crystal Microbalance
Authors: HEINZ PaulBRETAGNOL FredericMANNELLI ILARIAGILLILAND DOUGLASRAUSCHER HUBERTROSSI FRANCOIS
Citation: Journal of Physics: Conference Series vol. 100 p. 012033-1 012033-4
Publisher: IOP Publishing LTD
Publication Year: 2008
JRC Publication N°: JRC44452
ISSN: 1742-6588
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC44452
DOI: 10.1088/1742-6596/100/1/012033
Type: Articles in Journals
Abstract: Thermoresponsive poly(N-isopropylacrylamide) layers were grafted on plasmaactivated poly(ethylene oxide)-like substrate. Analysis by ToF-SIMS confirmed the presence of a pNIPAM film, which shows a phase transition temperature at 28 - 32 °C with hysteresis, as determined in-situ by quartz crystal microbalance. During the transition, the frequency of the pNIPAM coated quartz sensor exhibits a pronounced and unexpected minimum while the dissipation changes monotonously. This peculiar behaviour is explained by temporary formation of water-rich regions, which may cause delayed release and uptake of water during the collapse and re-swelling of the layer.
JRC Institute:Institute for Health and Consumer Protection

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