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dc.contributor.authorMorris, Cheryl
dc.contributor.authorSzczupak, Boguslaw
dc.contributor.authorRyder, Alan G.
dc.date.accessioned2012-09-28T18:22:30Z
dc.date.available2012-09-28T18:22:30Z
dc.date.issued2010
dc.identifier.citationMorris,C.,Szczupak,B.,Klymchenko,A.S.,Ryder,A.G. (2010) 'Study of water adsorption in PolyN-isopropylacrylamide) thin films using fluorescence emission of 3-hydroxyflavone probes'. Macromolecules, 43 (22):9488-9494.en_US
dc.identifier.issn1520-5835
dc.identifier.urihttp://hdl.handle.net/10379/2980
dc.descriptionJournal articleen_US
dc.description.abstractThe noncontact measurement of water uptake in microscale , thermoresponsive poly(N-isopropylacrylamide) thin films is challenging. We assessed the efficacy of three different 3-hydroxyflavone (3-HF)-based fluorophores to monitor water uptake in pNIPAM thin films close to the lower critical solution temperature (LCST) at 25 and 37 °C. These 3-HF fluorophores undergo excited-state intramolecular proton transfer, yielding emission from normal (N*) and tautomeric (T*) excited-state forms. The emission intensity ratio, log(IN*/IT*), and N* band position are environmentally sensitive. Water adsorption in pNIPAM thin films follows a nonlinear, two-phase process: at low relative humidity, the adsorbed water disrupts polymer-fluorophore hydrogen bonding, yielding small changes in log(IN*/IT*) ratios and overall intensity; at higher relative humidity, these intensity parameters (but not fluorescence lifetime) change dramatically, indicating a larger change in local polarity. These probes are thus sensitive indicators of water uptake in pNIPAM.en_US
dc.description.sponsorshipScience Foundation Ireland [Research Frontiers Grant number 07/RFP/MASF423]en_US
dc.formatapplication/pdfen_US
dc.language.isoenen_US
dc.publisherACS Publicationsen_US
dc.relation.ispartofMacromoleculesen
dc.subjectPolymeren_US
dc.subjectThermoresponsiveen_US
dc.subjectFluorescenceen_US
dc.subjectHumidityen_US
dc.subject3-Hydroxyflavoneen_US
dc.subjectESIPTen_US
dc.subjectLCSTen_US
dc.titleStudy of water adsorption in PolyN-isopropylacrylamide) thin films using fluorescence emission of 3-hydroxyflavone probesen_US
dc.typeArticleen_US
dc.date.updated2012-08-17T14:42:29Z
dc.identifier.doi10.1021/ma102152j
dc.local.publishedsourcehttp://dx.doi.org/10.1021/ma102152jen_US
dc.description.peer-reviewedpeer-reviewed
dc.contributor.funder|~|
dc.internal.rssid1159089
dc.local.contactAlan Ryder, School Of Chemistry, Room 228, Arts/Science Building, Nui Galway. 2943 Email: alan.ryder@nuigalway.ie
dc.local.copyrightcheckedYes
dc.local.versionACCEPTED
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