Browsing Araştırma Çıktıları | WoS | Scopus | TR-Dizin | PubMed by Author "Pekcan, Önder"
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Application of epidemic models to phase transitions
Bilge, Ayşe Hümeyra; Pekcan, Önder; Gürol, M. V. (Taylor & Francis Ltd, 2012)The Susceptible-Infected-Recovered (SIR) and Susceptible-Exposed-Infected-Recovered (SEIR) models describe the spread of epidemics in a society. In the typical case, the ratio of the susceptible individuals fall from a ... -
Application of fluorescence technique for understanding film formation from polymer latexes and composites
Uğur, Ş.; Pekcan, Önder (Elsevier, 2021)This chapter summarizes the application of fluorescence technique to understand all aspects of film formation using both pure polymer latexes and polymer nanocomposites. Transient fluorescence, steady state fluorescence, ... -
Cation Effect on Slow Release from Alginate Beads: A Fluorescence Study
Kaygusuz, Hakan; Erim, F. Bedia; Pekcan, Önder; Evingür, Gülşen Akin (Springer/Plenum Publishers, 2014)In this study spherical alginate beads containing pyranine (P-y) as a fluorescence probe were prepared by ionotropic gelation of a sodium alginate solution. The steady state fluorescence technique was used to study pyranine ... -
Comparison of cation effects on phase transitions of kappa and iota carrageenan
Tari, Özlem; Pekcan, Önder (European Polymer Federation, 2010)Phase transitions of kappa and iota carrageenan in KCl NaCl and CaCl2 solutions were separately studied during heating and cooling processes by using fluorescence technique. Scattered light I-SC and fluorescence intensity ... -
A comparison of fluorescence and UV-visible spectrometry techniques for thermal phase transitions of agarose gels
Arda, Ertan; Kara, Selim; Mergen, Ömer Bahadır; Pekcan, Önder (Springer, 2015)In this study thermoreversible phase transitions of high (HMP) and low (LMP) melting point agarose gels were investigated by using the UV-vis and fluorescence spectroscopy techniques. Pyranine was added to the aqueous ... -
Conductivity percolation of carbon nanotubes (CNT) in polystyrene (PS) latex film
Uğur, Şaziye; Yargı, Önder; Pekcan, Önder (Canadian Science Publishing Nrc Research Press, 2010)In this study the effect of multiwalled carbon nanotubes (MWNT) on film formation behaviour and electrical conductivity properties of polystrene (PS) latex film was investigated by using the photon transmission technique ... -
Conductivity Percolation of Carbon Nanotubes in Polyacrylamide Gels
Pekcan, Önder; Evingür, Gülşen Akın (Intech Europe, 2011)[Abstract Not Available] -
Critical Exponents of Gelation and Conductivity in Polyacrylamide Gels Doped by Multiwalled Carbon Nanotubes
Aktas, Demet Kaya; Evingür, Gülşen Akin; Pekcan, Önder (Taylor & Francis Ltd, 2010)Polyacrylamide (PAM) doped by multiwalled carbon nanotube (MWNT) gels were prepared with different amounts of MWNTs varying in the range between 0.1 and 15 wt%. The PAM-MWNT composite gels were characterized by the steady ... -
Critical Exponents of Kappa Carrageenan in the Coil-Helix and Helix-Coil Hysteresis Loops
Tarı, Özlem; Kara, Selim; Pekcan, Önder (Taylor & Francis Inc, 2009)The steady-state fluorescence technique was used to study coil-helix (sol-gel) and helix-coil (gel-sol) transitions of the kappa carrageenan-water system with various carrageenan contents. Fluorescence (I) and scattered ... -
Critical Exponents of Photoinitiated Gelation at Different Light Intensities
Doğruyol, Zekeriya; Arsu, Nergis; Pekcan, Önder (Taylor & Francis Inc, 2009)A photo-differential scanning calorimetric (Photo-DSC) technique was used to study the photoinitiated radical polymerization of a 75% epoxy diacrylate (EA) and 25% tripropyleneglycoldiacrylate (TPGDA) mixture with ... -
Critical Exponents of Thermal Phase Transitions of kappa-Carrageenan in Various Salt Solutions
Tarı, Özlem; Pekcan, Önder (Wiley-VCH Verlag GmbH, 2009)The steady state fluorescence (SSF) technique was employed to study the phase transitions Of kappa-carrageenan in NaCl and KCl solutions. Pyranine was used as a fluorescence probe for monitoring these transitions. Scattered ... -
Critical phenomenon during photoinitiated gelation at different temperatures: A Photo-DSC study
Dogruyol, Zekeriya; Arsu, Nergis; Dogruyol, Sevnur Keskin; Pekcan, Önder (Elsevier Science, 2011)The behaviour of photoinitiated radical polymerization of an 80 wt% epoxy diacrylate (EA) and 20 wt% tripropyleneglycoldiacrylate (TPGDA) mixture with 2-mercaptothioxanthone (TX-SH) photoinitiator was studied at different ... -
Diffusion energies of oxygen diffusing into polystyrene (PS)/poly (N-isopropylacrylamide) composites
Yargı, Önder; Ugur, Saziye; Pekcan, Önder (Wiley-Blackwell, 2012)Diffusion coefficient of oxygen penetrating into polystyrene (PS) latex/poly (N-isopropylacrylamide) (PNIPAM) microgel composite films were measured using Fluorescence technique. Three different (5 15 and 40wt%) PS content ... -
Drying of Polyacrylamide Composite Gels Formed with Various Kappa- Carrageenan Content
Evingür, Gülşen Akın; Pekcan, Önder (Springer/Plenum Publishers, 2011)Drying of polyacrylamide (PAAm)-kappa-carrageenan (kappa C) composite gels were monitored by using steady-state fluorescence technique. Disc shaped gels were formed from acrylamide (AAm) and N N'- methylenebisacrylamide(Bis) ... -
Drying of polyacrylamide-multiwalled carbon nanotube (MWNT) composites with various MWNTs contents: a fluorescence study
Evingür, Gülşen Akin; Pekcan, Önder (Walter De Gruyter Gmbh, 2013)We studied the drying of polyacrylamide (PAAm)-multiwalled carbon nanotube (MWNT) composites prepared by free radical crosslinking copolymerization in water with a steady state fluorescence technique. Composite gels were ... -
Drying process in vapor swollen heterogels
Erdogan, Matem; Pekcan, Önder (Springer, 2010)Disk-shaped heterogels were prepared by combining methyl methacrylate (MMA) and styrene (S) with ethylene glycol dimethacrylate (EGDM) as a crosslinker agent in the presence of 22'-azobisisobutyronitrile (AIBN). Swelling ... -
Effect of Calcium Ion Concentration on Small Molecule Desorption from Alginate Beads
Evingür, Gülşen Akin; Kaygusuz, Hakan; Erim, F. Bedia; Pekcan, Önder (Taylor & Francis Inc, 2014)Spherical alginate beads were prepared by ionotropic gelation of sodium alginate through the use of calcium ions. Pyranine (Py) was added to the alginate solution as a small molecule probe for fluorescence studies. Desorption ... -
EFFECT OF CONTENT AND TEMPERATURE ON THE PHASE TRANSITIONS OF POLYMER COMPOSITES DOPED BY KAPPA CARRAGEENAN AND ALGINATE
Evingür, Gülşen Akın; Pekcan, Önder (Elsevier Academic Press Inc, 2016)[Abstract Not Available] -
The effect of film thickness and TiO2 content on film formation from PS/TiO2 nanocomposites prepared by dip-coating method
Sunay, M. Selin; Pekcan, Önder; Ugur, Saziye (Hindawi Publishing Corporation, 2012)Steady-state fluorescence (SSF) technique in conjunction with UV-visible (UVV) technique and atomic force microscope (AFM) was used for studying film formation from TiO2 covered nanosized polystyrene (PS) latex particles ... -
Effect of LCST on the swelling of PAAm-NIPA copolymers: a fluorescence study
Evingür, Gülşen Akin; Pekcan, Önder (Springer, 2012)Temperature sensitive copolymers were prepared by free radical crosslinking copolymerization in aqueous solution with different molar percentage of N-isopropylacrylamide (NIPA) and acrylamide (AAm) monomers. NN'-methylenebis ...