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dc.contributor.authorAktaş, Demet Kayatr_TR
dc.contributor.authorEvingür, Gülşen Akıntr_TR
dc.contributor.authorPekcan, Mehmet Öndertr_TR
dc.date.accessioned2015-01-15T23:00:50Z
dc.date.available2015-01-15T23:00:50Z
dc.date.issued2007
dc.identifier.citationAktaş, D., Pekcan, Ö., & Evingur, G. (2007). Drying of PAAm hydrogels at various temperatures: A fluorescence study. Journal of Macromolecular Science, Part B, 46(3), 581-590. doi:10.1080/00222340701257950en_US
dc.identifier.issn0022-2348
dc.identifier.issn1525-609X
dc.identifier.otherWOS:000246476700013
dc.identifier.urihttp://hdl.handle.net/11729/272
dc.identifier.urihttp://dx.doi.org/10.1080/00222340701257950
dc.description.abstractThe steady-state fluorescence (SSF) technique was employed for studying the drying of polyacrylamide (PAAm) hydrogels. Disc-shaped hydrogels were prepared by free-radical crosslinking copolymerization of acrylamide (AAm) with N,N'-methylene bisacrylamide (BIS) as crosslinker in the presence of ammonium persulfate (APS) as an initiator. Pyranine (P) was introduced as a fluorescence probe and the intensity of pyranine was monitored during in situ drying at various temperatures. It was observed that the fluorescence intensity of pyranine increased during the drying process. A supporting, gravimetrical experiment was also performed. A phenomenological equation was introduced to determine the desorption coefficient, D, of water molecules from the drying hydrogels at various temperatures. The desorption activation energy, triangle E-d, values were measured for the drying processes and found to be 91.08 and 36.82 kJ mol(-1) by fluorescence and gravimetrical methods, respectively. This difference most probably originates from the origin of the techniques; the fluorescence technique measures the parameters at a molecular level, whereas the gravimetrical technique measures a parameter in the bulk.en_US
dc.language.isoenen_US
dc.publisherTaylor & Francis Groupen_US
dc.relation.isversionof10.1080/00222340701257950
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.sourceJournal of macromolecular science part b-physicsen_US
dc.subjectActivation energyen_US
dc.subjectDryingen_US
dc.subjectFluorescenceen_US
dc.subjectHydrogelsen_US
dc.subjectFast transient fluorescenceen_US
dc.subjectGelsen_US
dc.subjectHeterogelsen_US
dc.subjectDiffusionen_US
dc.subjectBehavioren_US
dc.titleDrying of PAAm hydrogels at various temperatures: A fluorescence studyen_US
dc.typearticleen_US
dc.description.versionPublisher' Versionen_US
dc.contributor.departmentIsik University, Faculty of Arts and Sciences, Department of Physicsen_US
dc.contributor.departmentIşık Üniversitesi, Fen Edebiyat Fakültesi, Fizik Bölümütr_TR
dc.contributor.authorIDTR9155
dc.contributor.authorIDTR117602
dc.contributor.authorIDTR51568
dc.identifier.volume46
dc.identifier.issue3
dc.identifier.startpage581
dc.identifier.endpage590
dc.peerreviewedYesen_US
dc.publicationstatusPublisheden_US


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