Temperature effect on drying and swelling of kappa carrageenan gels: A steady state fluorescence study
Yükleniyor...
Dosyalar
Tarih
2008
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Wiley-V C H Verlag GMBH
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
A novel technique based on in situ steady state fluorescence (SSF) measurements is introduced for studying drying and swelling Of kappa(-) carrageenan (kappa carrageenan) gels at various temperatures. kappa(-) carrageenan gels were completely dried and then swelled in water vapor. Pyranine was embedded in kappa(-) carrageenan and used as a fluorescence probe. Scattered light intensities, I-SC and fluorescence intensities, I were monitored during the drying and swelling Of kappa(-) carrageenan gels. it was observed that the fluorescence intensity decreased linearly as drying time was increased. A simple model consisting of Case II diffusion was used to quantify the drying processes of the kappa(-) carrageenan gels. This moving boundary model provided packing constant, kappa(o). During swelling, fluorescence intensity increased exponentially as time is increased. The increase in I, was modeled using Li-Tanaka equation from which swelling time constants, tau(c) and cooperative diffusion coefficients, D-c were determined. It was observed that swelling time constants, tau(c) decreased and diffusion coefficients, D-c increased as the swelling temperature was increased. Activation energies for drying and swelling were also obtained and found to be 53.9 and 47.2 kJ mol(-1), respectively.
Açıklama
Anahtar Kelimeler
Cooperative diffusion coefficients, Drying, Fluorescence, Kappa(-) carrageenan, Swelling, Fast transient fluorescence, Poly(Methyl Methacrylate) Gels, Polymer networks, Kinetics, Shrinking, Heterogels, Swollen, ABS resins, Activation energy, Biomechanics, Colloids, Dewatering, Diffusion, Gelation, Gels, Light emission, Lithium, Luminescence, Respiratory mechanics, Semiconductor doping, Water vapor, Carrageenan, Carrageenan gels, Case II, Diffusion coefficients, Drying processes, Drying times, Fluorescence intensities, Fluorescence probes, In-situ, Moving boundaries, Novel techniques, Pyranine, Scattered light, SIMPLE models, Steady state fluorescences, Swelling temperatures, Swelling times, Tanaka equations, Temperature effects, Curing
Kaynak
Macromolecular Symposia
WoS Q Değeri
Q3
Scopus Q Değeri
Q3
Cilt
265
Sayı
Künye
Tarı İlgin, Ö. & Pekcan, M. Ö. (2008). Temperature effect on drying and swelling of kappa carrageenan gels: A steady state fluorescence study. Macromolecular Symposia, 265(1), 37-48. doi:10.1002/masy.200850505
