Scopus İndeksli Yayınlar Koleksiyonu by Institution Author "Pekcan, Önder"
Now showing items 21-40 of 91
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Elastic percolation of swollen polyacrylamide (PAAm)-multiwall carbon nanotubes composite
Evingür, Gülşen Akin; Pekcan, Önder (Taylor & Francis Ltd, 2012)Polyacrylamide (PAAm)-multiwalled carbon nanotube (MWNT) composites were prepared via free radical cross-linking copolymerization with different amounts of MWNTs varying in the range between 0.1 and 50 wt%. The mechanical ... -
Elastic Properties of a Swollen PAAm-NIPA Copolymer with Various NIPA Contents
Evingür, Gülşen Akin; Pekcan, Önder (Taylor & Francis, 2014)Copolymer based on cross-linked polyacrylamide (PAAm) having N-isopropylacrylamide (NIPA) was prepared and their elastic properties were studied as a function of NIPA contents. NIPA content dependency of the shear modulus ... -
Elasticity Study of PAAm-kappa C Composite Prepared in Various kappa C Content and Measured at Several Temperatures
Evingür, Gülşen Akin; Pekcan, Önder (Polish Acad Sciences Inst Physics, 2015)Polyacrylamide (PAAm)-kappa carrageenan (kappa C) composite gels were prepared via free radical crosslinking copolymerization with various (w/v) percentages of kappa C in the range between 0.5 and 3 (w/v)% of kappa C . ... -
Electrical and optical percolations in PMMA/GNP composite films
Arda, Ertan; Mergen, Omer Bahadir; Pekcan, Önder (Taylor & Francis Ltd, 2018)Effects of graphene nanoplatelet (GNP) addition on the electrical conductivity and optical absorbance of poly(methyl methacrylate)/graphene nanoplatelet (PMMA/GNP) composite films were studied. Optical absorbance and two ... -
Electrical and optical percolations of polystyrene latex-multiwalled carbon nanotube composites
Kara, Selim; Arda, Ertan; Dolastir, Fahrettin; Pekcan, Önder (Academic Press Inc Elsevier Science, 2010)Electrical conductivity and optical transmittance properties of polystyrene (PS)-multiwalled carbon nanotube (MWCNT) composite films were investigated. Composite films were prepared by mixing of various mass fractions of ... -
Electrical optical and fluorescence percolations in P(VAc-co-BuA)/MWCNT composite films
Arda, Ertan; Kara, Selim; Pekcan, Önder (Taylor & Francis Ltd, 2013)Effects of multiwall carbon nanotube (MWCNT) addition on the electrical conductivities optical transparencies and fluorescence emissions of poly(vinyl acetate-co-butyl acrylate) (P(VAc-co-BuA))/MWCNT composite films were ... -
Energy needs for drying of PAAm- kappa C composites prepared with various kappa C contents
Pekcan, Önder; Evingür, Gülşen Akın (European Polymer Federation, 2011)Various polyacrylamide (PAAm) - Kappa Carrageenan (kappa C) composite gels were prepared from acrylamide (AAm) N N'- methylenebisacrylamide (BIS) and different kappa C contents by free radical crosslinking copolymerization ... -
Epidemic models for phase transitions: application to a physical gel
Bilge, Ayşe Hümeyra; Pekcan, Önder; Kara, Selim; Öğrenci, Arif Selçuk (Taylor & Francis Ltd, 2017)Carrageenan gels are characterized by reversible sol-gel and gel-sol transitions under cooling and heating processes and these transitions are approximated by generalized logistic growth curves. We express the transitions ... -
Evaluation of the fractal dimension of polyacrylamide during gelation and swelling
Arda, Ertan; Kara, Selim; Pekcan, Önder; Gülşen, Akın-Evingür (Elsevier, 2021)[Abstract Not Available] -
Film Formation of Nano-Sized Hard Latex (PS) in Soft Polymer Matrix (PBA): An Excimer Study
Uğur, Şaziye; Sunay, Selin; Pekcan, Önder (John Wiley & Sons Inc, 2010)This work reports steady state fluorescence (SSF) technique for studying film formation from pyrene (P)labeled nano-sized polystyrene (PS) and poly(n-butyl acrylate) (PBA) hard/soft latex blends. Blend films were prepared ... -
Fluorescence and photon transmission techniques for studying film formation from PS/GO nanocomposites
M. Selin, Sunay; Şaziye, Uğur; Pekcan, Önder (SPRINGER, 2020)Steady-state fluorescence and UV-Vis techniques were used to study the film formation behavior of composites consisting of pyrene (P)-labeled polystyrene (PS) latex and graphene oxide (GO) in terms of PS latex/GO volume ... -
Fluorescence quenching method for monitoring oxygen diffusion into PS/CNT composite films
Yargı, Önder; Uğur, Şaziye; Pekcan, Önder (Elsevier Science SA, 2013)Oxygen permeabilities of nanocomposite films consisting of multi wall carbon nanotubes (MWNT) and polystyrene (PS) were determined to investigate the oxygen diffusion depending on MWNT and temperature. A method which is ... -
Fluorescence study of effect of particle size in PS latex/Al2O3 nanocomposite films
Uğur, Şaziye; Sunay, M. Selin; Pekcan, Önder (MANEY PUBLISHING, 2015)Steady state fluorescence and BioUV-Visible techniques were used to study film formation of polystyrene (PS) latex and Al2O3 composites depending on PS particles size and Al2O3 content. Two film series (SmPS/Al2O3 and ... -
Fluorescence study of film formation from PS/Al2O3 nanocomposites
Pekcan, Önder; Uğur, Şaziye; Sunay, M. Selin (Elsevier Science, 2014)Steady state fluorescence (SSF) and UV-vis (UVV) techniques were used to study the film formation behavior of pyrene (P) labeled polystyrene (PS) latex and Al2O3 (PS/Al2O3) composites depending on PS particles size and ... -
Fluorescence study on drying of iota-carrageenan gels at different temperatures prepared with various CaCl2 content
Tari, Özlem; Pekcan, Önder (Springer, 2011)The influence of temperature and salt content on drying was investigated by using steady-state fluorescence (SSF) technique. Supporting gravimetric and volumetric measurements were also carried out during drying of gels ... -
Fractal dimension and phase transition of graphene oxide (GO) doped polyacrylamide
Evingür, Gülşen Akın; Pekcan, Önder (ELSEVIER SCI LTD, 2020)Graphene Oxide (GO)- Polyacrylamide composites prepared between 5 and 50 mu l GO were performed by Fluorescence Spectroscopy. The phase transition performed on the composites was measured by calculating the critical ... -
Fractal Dimensions of kappa-Carrageenan Gels during Gelation and Swelling
Kara, Selim; Arda, Ertan; Pekcan, Önder (Taylor & Francis Inc, 2018)A photon scattering technique for research on the sol-gel and gel-sol transitions in kappa-carrageenan-water systems with various carrageenan contents (CC) was utilized for characterizing the fractal dimensions during ... -
Fractal Features and Structural Morphological Optical Characteristics of Sol-Gel Derived Silica Nanoparticled Thin Films
Uysal, Bengü Özuğur; Pekcan, Önder (Polish Acad Sciences Inst Physics, 2018)Nanostructured silica films using a simple and effective sol-gel spin coating technique were synthesized and the influence of ammonia/sol ratios on the particle size and thickness of this film was investigated. In addition ... -
Gelation electrical conductivity and elasticity of PAM- MWNT
Evingür, Gülşen Akin; Pekcan, Önder (Cambridge Univ Press, 2011)Polyacrylamide- Multiwalled carbonnanotube (PAM- MWNT) composites were prepared via free radical crosslinking copolymerization with different amounts of MWNT varying in the range between 0.1 and 15 wt. %. PAM- MWNT composite ... -
GELATION MECHANISMS
Pekcan, Önder; Kara, Selim (World Scientific Publ Co Pte Ltd, 2012)In this paper, we survey the gelation mechanisms for various polymeric systems which are classified by the type and the strength of the cross-linkages. These are the "irreversible" gels that are cross-linked chemically by ...