Yazar "Pekcan, Mehmet Önder" için listeleme
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Study of drying of kappa-carrageenan gel at various temperatures using a fluorescence technique
Tarı İlgin, Özlem; Pekcan, Mehmet Önder (Taylor & Francis Inc, 2008-01)The steady-state fluorescence technique was used to study drying of kappa-carrageenan gel at various temperatures. Pyranine was doped as a fluorescence probe, and scattered light, I-sc, and fluorescence intensities, I, ... -
Study on critical behaviour in N-isopropyl acrylamide gels by using fluorescence technique
Kaya Aktaş, Demet; Pekcan, Mehmet Önder (Taylor & Francis Group, 2006-11)The steady state fluorescence (SSF) technique was used to study the sol-gel transition for the solution free radical crosslinking copolymerization of N-isopropyl acrylamide (NIPA), with N,N'-methylenebis (acrylamide) (BIS) ... -
Study on swelling of hydrogels (PAAm) at various temperatures by using fluorescence technique
Kaya Aktaş, Demet; Evingür, Gülşen Akın; Pekcan, Mehmet Önder (Springer US, 2007-10)Steady-state fluorescence (SSF) technique was employed for studying swelling of polyacrylamide (PAAm) hydrogels. Disc-shaped gels were prepared by free-radical crosslinking copolymerization of acrylamide (AAm) with N, N'- ... -
Studying on the small molecule diffusion into hydrogels: a fluorescence study
Evingür, Gülşen Akın; Karslı, Kadir; Pekcan, Mehmet Önder (Amer Inst Physics, 2007)In situ steady state fluorescence experiments (SSF) were reported during the diffusion of water molecules into PAAm in gels at various temperatures. The fluorescence emission intensities, Ip increased continuously as water ... -
Swelling activation energy of kappa-carrageenan in its gel state: A fluorescence study
Tarı İlgin, Özlem; Pekcan, Mehmet Önder (John Wiley & Sons Inc, 2007-12-15)A steady-state fluorescence technique was employed to study the swelling Of K-carrageenan gels at various temperatures. Pyranine was used as a fluorescence probe. The fluorescence intensity of pyranine was measured during ... -
Swelling of iota-carrageenan gels prepared with various CaCl2 content: A fluorescence study
Tarı İlgin, Özlem; Pekcan, Mehmet Önder (European Polymer Federation, 2008-01-05)Iota carrageenan gels prepared with various CaCl2 content were completely dried and then swelled in water vapor. Steady-state fluorescence ( SSF) technique was used to monitor the swelling process of each iota carrageenan ... -
Synergistic effect of the locust bean gum on the thermal phase transitions of kappa-carrageenan gels
Arda, Ertan; Kara, Selim; Pekcan, Mehmet Önder (Elsevier Sci Ltd, 2009-03)Synergism between K-carrageenan and locust bean gum (LBG) was studied using the photon transmission technique. Synergistic effects in these polymeric mixtures strongly affected the physical properties of the gel structure. ... -
Synthesis and liquid crystalline behavior of random copolymer of poly(ethylene oxide) macromonomer and liquid crystalline monomer by the photon transmission technique
Yıldız, Sevtap; Yılmaz, Faruk; Özbek, Haluk; Pekcan, Mehmet Önder; Ito, Koichi; Yağcı, Yusuf (Taylor & Francis Inc, 2005-12)Random copolymers of poly(ethylene oxide) macromonomer with p-vinylbenzyl end-functional group (PEOVB) and liquid crystalline monomer, namely 6-(4-cyanobiphenyl-4'-oxy)hexyl acrylate (COA), were prepared by conventional ... -
Temperature effect on drying and swelling of kappa carrageenan gels: A steady state fluorescence study
Tarı İlgin, Özlem; Pekcan, Mehmet Önder (Wiley-V C H Verlag GMBH, 2008)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 ... -
Time evolution of film formation from polystyrene particles: a percolation approach
Uğur, Şaziye; Pekcan, Mehmet Önder (Springer, 2005-12)This work reports the film formation process from surfactant-free polystyrene (PS) latex particles. Steady state fluorescence and photon transmission techniques were used to study the evolution of film formation. The films ... -
Universal behaviour of gel formation from acrylamide-carrageenan mixture around the gel point: A fluorescence study
Kaya Aktaş, Demet; Evingür, Gülşen Akın; Pekcan, Mehmet Önder (Taylor & Francis Group, 2006-08)The steady state fluorescence (SSF) technique was used to study the sol-gel transition, for the solution free radical crosslinking copolymerization of acrylamide (AAm) with various carrageenan content. N, N'- methylenebis ... -
Universal behaviour of glass transition exponents in various polymeric systems
Pekcan, Mehmet Önder; Kaya Aktaş, Demet (VSP BV, Brill Academic Publishers, 2005)The fast transient fluorescence (FTRF) technique was used to study the critical exponents during glass transition in free-radical cross-linking copolymerization (FCC). Methyl methacrylate (MMA), ethyl methacrylate (EMA) ... -
Universality of sol-gel phase transition of kappa-carrageenan in various salts: a steady state fluorescence study
Pekcan, Mehmet Önder; Tarı İlgin, Özlem (Taylor & Francis Ltd, 2007-08)Thermal phase transitions of kappa-carrageenan in NaCl, KCl and CaCl2 solutions were studied using steady state fluorescence (SSF) technique. Pyranine was introduced as a fluorescence probe for studying sol-gel phase ... -
Vapor-induced film formation from low-T-g particles for different solvent compositions
Arda, Ertan; Kara, Selim; Saraç, Ayfer; Pekcan, Mehmet Önder (Elsevier Inc, 2006-05-15)The photon transmission method was used to study latex film formation from poly(vinyl acetate) (PVAc) particles induced by two different solvents. Films with the same latex content were prepared from PVAc particles and ...