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Study of water adsorption in PolyN-isopropylacrylamide) thin films using fluorescence emission of 3-hydroxyflavone probes

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dc.contributor.author Morris, Cheryl
dc.contributor.author Szczupak, Boguslaw
dc.contributor.author Ryder, Alan G.
dc.date.accessioned 2012-09-28T18:22:30Z
dc.date.available 2012-09-28T18:22:30Z
dc.date.issued 2010
dc.identifier.citation Morris,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.issn 1520-5835
dc.identifier.uri http://hdl.handle.net/10379/2980
dc.description Journal article en_US
dc.description.abstract The 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.sponsorship Science Foundation Ireland [Research Frontiers Grant number 07/RFP/MASF423] en_US
dc.format application/pdf en_US
dc.language.iso en en_US
dc.publisher ACS Publications en_US
dc.relation.ispartof Macromolecules en
dc.subject Polymer en_US
dc.subject Thermoresponsive en_US
dc.subject Fluorescence en_US
dc.subject Humidity en_US
dc.subject 3-Hydroxyflavone en_US
dc.subject ESIPT en_US
dc.subject LCST en_US
dc.title Study of water adsorption in PolyN-isopropylacrylamide) thin films using fluorescence emission of 3-hydroxyflavone probes en_US
dc.type Article en_US
dc.date.updated 2012-08-17T14:42:29Z
dc.identifier.doi 10.1021/ma102152j
dc.local.publishedsource http://dx.doi.org/10.1021/ma102152j en_US
dc.description.peer-reviewed peer-reviewed
dc.contributor.funder |~|
dc.internal.rssid 1159089
dc.local.contact Alan Ryder, School Of Chemistry, Room 228, Arts/Science Building, Nui Galway. 2943 Email: alan.ryder@nuigalway.ie
dc.local.copyrightchecked Yes
dc.local.version ACCEPTED

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