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|Title:||Phase Transition of pNIPAM Grafted on Plasma-Activated PEO Monitored in-Situ by Quartz Crystal Microbalance|
|Authors:||HEINZ Paul; BRETAGNOL Frederic; MANNELLI ILARIA; GILLILAND DOUGLAS; RAUSCHER HUBERT; ROSSI FRANCOIS|
|Citation:||Journal of Physics: Conference Series vol. 100 p. 012033-1 012033-4|
|Publisher:||IOP Publishing LTD|
|JRC Publication N°:||JRC44452|
|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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