Yazar "Pekcan, Mehmet Önder" için listeleme
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Molecular alignment during gel formation from methyl methacrylate: An excimer fluorescence study
Kaya Aktaş, Demet; Erdoğan, Matem; Pekcan, Mehmet Önder (Taylor & Francis Ltd, 2005-05)Glass transition during bulk polymerization was studied in free-radical cross-linking copolymerization (FCC) of methyl methacrylate (MMA) using the steady-state fluorescence (SSF) technique. Naphthalene (N) was used as a ... -
Molecular recognition during sol-gel and gel-sol transition of kappa-iota carrageenan mixtures
Kara, Selim; Arda, Ertan; Pekcan, Mehmet Önder (Taylor & Francis ltd, 2005-12)Sol-gel and gel-sol phase transitions of kappa-iota (kappa-iota) carrageenan mixtures in two types of salts were studied using photon transmission technique. Here, KCl and CaCl2 were chosen as the proper salts for the ... -
Monitoring diffusion of reptating polymer chains by a direct energy transfer method: A Monte Carlo simulation
Tüzel, Erkan; Kısacıkoğlu, Kemal Batuhan; Pekcan, Mehmet Önder (Wiley-Blackwell, 2002-07-29)A kinetic Monte Carlo method was used to simulate the diffusion of reptating polymer chains across an interface. A time-resolved fluorescence technique in conjunction with a direct energy transfer method was used to measure ... -
Monitoring small molecule diffusion into hydrogels at various temperatures by fluorescence technique
Evingür, Gülşen Akın; Karslı, Kadir; Pekcan, Mehmet Önder (Elsevier B.V., 2006-12-01)steady state fluorescence technique was used to study small molecule diffusion into polyacrylamide (PAAm) gels at various temperatures. Pyranine (P-y), dissolved in water was introduced as a probe and fluorescence emission ... -
Monovalent and divalent cation effects on phase transitions of iota-carrageenan
Kara, Selim; Arda, Ertan; Pekcan, Mehmet Önder (Sage Publications Ltd, 2007-01)Phase transitions Of L-carrageenan in a variety of monovalent (Li, Na, K) and divalent (Mg, Ca, Sr) cation solutions were studied during heating and cooling by using photon transmission technique. Photon transmission ... -
Percolation approach to film formation from surfactant-free polystyrene particles
Uğur, Şaziye; Pekcan, Mehmet Önder (Taylor & Francis, 2005-09)In this study, a film formation process from surfactant-free polystyrene (PS) latex particles is reported. Steady state fluorescence (SSF) and photon transmission (UVV) techniques were used to study the evolution of film ... -
Phase transitions of kappa-carrageenan gels in various types of salts
Kara, Selim; Arda, Ertan; Kavzak, Burhan; Pekcan, Mehmet Önder (John Wiley & Sons Inc, 2006-11-05)Sol-gel and gel-sol phase transitions of K-carrageenan in various types of salts were studied using photon transmission technique. Here, LiCl, NaCl, KCl, MgCl2, CaCl2, and SrCl2 were chosen as the proper salts for the ... -
A photon transmission study for film formation from poly(vinyl acetate) latex particles with different molecular weights
Arda, Ertan; Kara, Selim; Pekcan, Mehmet Önder (John Wiley & Sons Inc, 2007-10-15)The photon transmission technique was used to monitor the temperature evolution of film formation from poly(vinyl acetate) (PVAc) latex particles with two different molecular weights. Two sets of latex films were prepared ... -
Photon transmission study on conformational ordering of iota-carrageenan in CaCl2 solution
Kara, Selim; Pekcan, Mehmet Önder (Taylor & Francis Inc, 2005-06)Coil-to-double helix (c-h) and double helix-to-dimer (h-d) phase transitions of iota-carrageenan in CaCl2 solution upon cooling were studied using photon transmission technique. Photon transmission intensity, I-iota r was ... -
Poly (styrene) latex/modified na-activated bentonite nanocomposite films: a fluorescence study
Uğur, Şaziye; Yargı, Önder; Günister, Ebru; Pekcan, Mehmet Önder (Elsevier Science BV, 2008-12)We studied film formation of composites of surfactant-free polystyrene (PS) nanoparticles and modified Na-activated bentonite (MLB), by steady state fluorescence (SSF) technique. The films were prepared from a mixture of ... -
Reordering of polystyrene gel due to multiple swelling in organic vapor fast transient fluorescence technique study
Erdoğan, Matem; Pekcan, Mehmet Önder (Elsevier Science SA, 2006-07-31)Reordering of disc-shaped polystyrene (PS) gels due to multiple swelling, under organic vapor was studied by using Fast Transient Fluorescence (FTRF) technique. Disc-sbaped polystyrene gels were prepared by free radical ... -
Reversible film formation from nano-sized PNIPAM particles below glass transition
Uğur, Şaziye; Elaissari, Abdelhamid; Yargı, Önder; Pekcan, Mehmet Önder (Springer-Verlag, 2007-01)Reversible film formation process from nano-sized Poly(N-isopropylacrylamide) (PNIPAM) microgel particles were studied during heating-cooling cycles at various rates. Photon transmission technique was used and transmitted ... -
Reversible film formation from PS doped PNIPAM particles in various compositions
Uǧur, Şaziye; Yargı, Önder; Pekcan, Mehmet Önder (John Wiley & Sons Inc, 2008-02)Film formation from polystyrene (PS) doped poly(N-isopropylacrylamide) (PNIPAM) particles was studied using photon transmission technique. The transmitted light intensity, Itr, was monitored during film formation process. ... -
Slow release from carrageenan gels at various temperatures
Tarı İlgin, Özlem; Pekcan, Mehmet Önder (Prous Science, SA, 2007-07)[No abstract available] -
Small molecule desorption from a swelling polymeric glass in polymer solution: Energy transfer method
Uğur, Şaziye; Pekcan, Mehmet Önder (Elsevier Science Sa, 2005-07-15)Direct energy transfer (DET) method conjunction with fast transient fluorescence (FTRF) technique were used to study small molecule desorption from a swelling poly(methyl methacrylate) (PMMA) glass in polymer solution, ... -
Small molecule desorption prior to dissolution of a polymeric glass
Pekcan, Mehmet Önder; Uğur, Şaziye (Wiley Subscription Services, Inc., A Wiley Company, 2006-07-15)Poly(methyl methacrylate) (PMMA) discs in various molecular weights (M-w) were prepared by free-radical polymerization. Pyrene (Py) was introduced during polymerization as a fluorescence probe. In situ steady state ... -
Small molecule diffusion into swelling Iota-Carrageenan gels: A fluorescence study
Ataman, Evren; Pekcan, Mehmet Önder (Taylor & Francis Group, 2007-04)Small molecule diffusion into Iota-Carrageenan gel was studied by using steady-state fluorescence (SSF) technique. Pyranine, dissolved in water was used as fluorescence probe. Fluorescence emission intensity, I-p, and ... -
Small molecule sorption and desorption in and out of iota-carrageenan gels
Ataman, Evren; Pekcan, Mehmet Önder (Taylor & Francis Group, 2007-08)Small molecule sorption and desorption in and out of Iota-Carrageenan was studied by using steady-state fluorescence (SSF) technique. Pyranine dissolved in water used as fluorescence probe. Fluorescence emission intensity, ... -
Small molecule sorption and desorption in and out of PAAm hydrogels at various temperatures
Evingür, Gülşen Akın; Karslı, Kadir; Pekcan, Mehmet Önder (Prous Science, SA, 2007-07)[No abstract available] -
Sorption and slow release kinetics of PAAM gels at various temperatures
Evingür, Gülşen Akın; Pekcan, Mehmet Önder (Freund Publishing House Ltd, 2007-11)Small molecule sorption and slow release in and out of polyacrylamide (PAAm) gels were studied by using steady state fluorescence (SSF) technique. Pyranine (P-y) dissolved in water used as a probe. Fluorescence emission ...