Evingür, Gülşen AkınPekcan, Önder2019-06-272019-06-27201280924-30460924-3046https://hdl.handle.net/20.500.12469/933https://doi.org/10.1080/09243046.2012.690299Polyacrylamide (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.eninfo:eu-repo/semantics/openAccessMulti walled carbon nanotubes (MWNT)AcrylamideCompositeFluorescenceTemperatureDryingSwellingArticle193208221WOS:00030753280000610.1080/09243046.2012.6902992-s2.0-84866947399N/AQ2