Monitoring of dynamical processes in PAAm-MWNTs composites by fluorescence method

dc.contributor.authorEvingür, Gülşen Akın
dc.contributor.authorPekcan, Önder
dc.date.accessioned2019-06-27T08:04:23Z
dc.date.available2019-06-27T08:04:23Z
dc.date.issued2012
dc.departmentFakülteler, Mühendislik ve Doğa Bilimleri Fakültesi, Biyoinformatik ve Genetik Bölümüen_US
dc.description.abstractPolyacrylamide (PAAm)-multi walled carbon nanotube (MWNT) composites were prepared by free radical cross-linking copolymerization in water. Ammonium persulfate and NN'-methylenebis (acrylamide) (BIS) were used as a free radical initiator and a crosslinker respectively. The drying and swelling processes of disc shaped PAAm-MWNT composites were monitored by the steady-state fluorescence technique at various temperatures. Disc shaped composite gels were prepared with pyranine (P) doped as a fluorescence probe. Scattered I-sc and emission light I-em intensities were monitored during drying and swelling of these gels. Since the decrease and increase in I-sc corresponds to the decrease and increase in turbidity of the drying and swelling hydrogel respectively the corrected fluorescence intensity I was introduced to analyse the drying and swelling processes. The Stern-Volmer equation combined with moving boundary and Li-Tanaka models were used to explain the behavior of I during drying and swelling processes respectively. Results indicated that the desorption coefficient D-d decreased by increasing MWNT content until 1 weight percentage of MWNT is reached and then increased above 1 wt% MWNT for a given temperature during drying. However cooperative diffusion coefficient D-s behaved opposite to D-d during swelling at a given temperature. Supporting gravimetric and volumetric experiments were also carried out during drying and swelling of PAAm-MWNT composite gels.en_US]
dc.identifier.citation8
dc.identifier.doi10.1080/09243046.2012.690299en_US
dc.identifier.endpage208
dc.identifier.issn0924-3046en_US
dc.identifier.issn0924-3046
dc.identifier.issue2
dc.identifier.scopus2-s2.0-84866947399en_US
dc.identifier.scopusqualityQ2
dc.identifier.startpage193en_US
dc.identifier.urihttps://hdl.handle.net/20.500.12469/933
dc.identifier.urihttps://doi.org/10.1080/09243046.2012.690299
dc.identifier.volume21en_US
dc.identifier.wosWOS:000307532800006en_US
dc.identifier.wosqualityN/A
dc.institutionauthorEvingür, Gülşen Akınen_US
dc.institutionauthorPekcan, Önderen_US
dc.language.isoenen_US
dc.publisherTaylor & Francis Ltden_US
dc.relation.journalAdvanced Composite Materialsen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectMulti walled carbon nanotubes (MWNT)en_US
dc.subjectAcrylamideen_US
dc.subjectCompositeen_US
dc.subjectFluorescenceen_US
dc.subjectTemperatureen_US
dc.subjectDryingen_US
dc.subjectSwellingen_US
dc.titleMonitoring of dynamical processes in PAAm-MWNTs composites by fluorescence methoden_US
dc.typeArticleen_US
dspace.entity.typePublication

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