Browsing by Author "Özçelik, Serdar"
Now showing items 1-20 of 37
-
Absorption spectrum of monomeric pseudoisocyanine: A new perspective and its implications for formation and spectral response of J-aggregates in solution and in thin films
Gülen, Demet; Özçelik, Serdar (Elsevier, 2008-05)We argued against the current spectral assignment for absorption spectrum of monomeric PIC which is widely accepted since the pioneering works of Scheibe and Jelley [G. Scheibe, Angew. Chem. 49 (1936) 563; E.E. Jelly, ... -
Biofunctional quantum dots as fluorescence probe for cell-specific targeting
Ağ, Didem; Bongartz, Rebecca; Eral Doğan, Leyla; Seleci, Muharrem; Walter, Johanna G.; Odacı Demirkol, Dilek; Stahl, Frank; Özçelik, Serdar; Timur, Suna; Scheper, Thomas (Elsevier, 2014-02)We describe here the synthesis, characterization, bioconjugation, and application of water-soluble thioglycolic acid TGA-capped CdTe/CdS quantum dots (TGA-QDs) for targeted cellular imaging. Anti-human epidermal growth ... -
Cholesterol Dictates the Freedom of EGF Receptors and HER2 in the Plane of the Membrane
Orr, Galya; Hu, Dehong; Özçelik, Serdar; Wiley, H. Steven; Colson, Steven D.; Opresko, Lee K. (Elsevier, 2013-10-01)The flow of information through the epidermal growth factor receptor (EGFR) is shaped by molecular interactions in the plasma membrane. The EGFR is associated with lipid rafts, but their role in modulating receptor mobility ... -
Composites of reactive silica nanoparticles and poly(glycidyl methacrylate) with linear and crosslinked chains by in situ bulk polymerization
Demir, Mustafa M.; Altın, Burcu; Özçelik, Serdar (Koninklijke Brill NV, 2010-11)Composites of poly(glycidyl methacrylate) (PGMA) and L-lysine-coated silica nanoparticles with varying contents were prepared by in situ bulk polymerization using benzoyl peroxide (BPO) as free radical initiator. Silica ... -
Controlled Formation of the Two-Dimensional TTBC J-Aggregates in an Aqueous Solution
Birkan, Burak; Gülen, Demet; Özçelik, Serdar (American Chemical Society, 2013-09-30)Strong experimental and theoretical evidence was provided on the controlled formation of the two-dimensional J-aggregates that were assembled in the herringbone morphology. The exciton-band structure formation of ... -
Controlling spontaneous emission of CdSe nanoparticles dispersed in electrospun fibers of polycarbonate urethane
Demir, Mustafa M.; Soysal, Duygu; Ünlü, Caner; Kuş, Mahmut; Özçelik, Serdar (American Chemical Society, 2009)Luminescent fibrous composite films consisting of submicrometer diameter fibers were prepared by electrospinning of segmented polycarbonate urethane (PCU) in dimethyl formamide and tri-n-octylphosphine oxide (TOPO)-capped ... -
Developing a facile 1 method for highly luminescent colloidal CdSxSe1_x ternary nanoalloys†
Ünlü, Caner; Ünal Tosun, Gülçin; Sevim, Seçil; Özçelik, Serdar (Royal Society of Chemistry, 2013)We report a facile method to synthesize highly luminescent colloidal CdSxSe1 xternary nanoalloys. The synthesis is achieved exactly in one-step, one-pot and at low temperature, by applying the two-phase thermal approach. ... -
Development of a novel electrocardiography sensor based on a composite silver chloride nanoparticles and polyaniline
Taşcıoğlu, Didem (İzmir Institute of Technology, 2013)The electrical activity of the heart is detected by electrodes attached to the surface of the skin. These electrodes detect bioelectrical signals in the human body. Physilogical status of heart condition especially ... -
Development of colloidal alloyed nanocrystals for quantum dot based device applications
Sevim Ünlütürk, Seçil (Izmir Institute of Technology, 2018-06)Quantum dots (QDs) are very attractive luminescent semiconducting nanoparticles. In this study, our aim was to synthesize Cd and/or Zn based QDs with tunable optical properties by the particle size and the alloy ... -
Development of semiconductor nanocrystals for biotechnological applications
Ünlü, Caner (İzmir Institute of Technology, 2008)Semiconductor nanocrystals are very useful tools in biological applications because of their unique optical properties. In this study, synthesis and characterization of CdTe / CdS and CdSexS1-x nanocrystals were carried ... -
Dynamic nuclear polarization of spherical nanoparticles
Akbey, Ümit; Altın, Burcu; Linden, Arne; Özçelik, Serdar; Gradzielski, Michael; Oschkinat, Hartmut (Royal Society of Chemistry, 2013-12)Spherical silica nanoparticles of various particle sizes (∼10 to 100 nm), produced by a modified Stoeber method employing amino acids as catalysts, are investigated using Dynamic Nuclear Polarization (DNP) enhanced Nuclear ... -
The effects of engineered silica nanoparticles on the cellular behaviours of human hepatocellular carcinoma cell lines
Tüncel Çerik, Özge (Izmir Institute of Technology, 2018-07)Physicochemical properties of the silica nanoparticles have vital roles in determining the physiological behaviours of the cells. Applications of nanoparticle treatments have some outcomes as a response of the cells in ... -
Enthalpy-driven selective loading of CdSe0.75S0.25 nanoalloys in triblock copolymer polystyrene-b-polyisoprene-b-polystyrene
Aşkın, Görkem; Çeçen, Volkan; Ünlütürk, Seçil Sevim; Özçelik, Serdar; Demir, Mustafa M. (Elsevier, 2016-09-01)CdSe0.75S0.25 nanoalloys were blended with asymmetric triblock copolymer of polystyrene-b-polyisoprene-b-polystyrene(PS-SIS) in tetrahydrofuran. The fraction of styrene block varies from 14 to 22% with respect to isoprene ... -
Erratum: Optical transition rates of a meso-substituted thiacarbocyanine in methanol-in-oil reverse micelles (Journal of Luminescence (2005) 113 (1-8) DOI:10.1016/j.jlumin.2004.07.009)
Özçelik, Serdar; Atay, N. Zeynep (Elsevier, 2005-09)The correct correspondence information for the first author is: Serdar Özçelik Chemistry Department, Izmir Institute of Technology, Urla-35430 Izmir, Turkey E-mail address: serdarozcelik@iyte.edu.tr Tel.: +90 232 750 ... -
Folic acid modified clay/polymer nanocomposites for selective cell adhesion
Barlas, F. B.; Ağ Şeleci, D.; Özkan, M.; Demir, B.; Şeleci, M.; Aydın, M.; Taşdelen, M. A.; Zareie, Hadi M.; Timur, S.; Özçelik, Serdar; Yağcı, Y. (Royal Society of Chemistry, 2014-10)A folic acid (FA) modified poly(epsilon-caprolactone)/clay nanocomposite (PCL/MMT-(CH2CH2OH)2-FA) resulting in selective cell adhesion and proliferation was synthesized and characterized as a cell culture and biosensing ... -
Formation of Pseudoisocyanine J-Aggregates in Poly(vinyl alcohol) Fibers by Electrospinning
Demir, Mustafa M.; Özen, Bengisu; Özçelik, Serdar (American Chemical Society, 2009-08-05)Submicrometer diameter, light emitting fibers of poly(vinyl alcohol) (PVA) doped with pseudoisocyanine (1,1′-diethyl-2,2′-cyanine bromide, PIC) dye were prepared by electrospinning. A horizontal setup was employed with ... -
FRET measurements between small numbers of molecules identifies subtle changes in receptor interactions
Özçelik, Serdar; Orr, Galya; Hu, Dehong; Chen, Chii-Shiarng; Reşat, Haluk; Harms, Greg S.; Opresko, Lee K.; Wiley, H. Steven; Colson, Steven D. (2013-10-08)Overexpression of HER2 alters the cellular behavior of EGF receptor (EGFR) and itself,with great implications on cell fate. To understand the molecular interactions underlying these alterations, we quantified the association ... -
Hierarchial coassembly of a cyanine dye in poly(vinyl alcohol) fibrous films by electrospinning
Demir, Mustafa M.; Horzum, Nesrin; Özen, Bengisu; Özçelik, Serdar (American Chemical Society, 2013-09)We report molecular aggregate formation of TTBC (1,1′,3,3′- tetraethyl-5,5′,6,6′-tetrachlorobenzimidazolocarbocyanine) in submicrometer-sized PVA (poly(vinyl alcohol)) fibers by electrospinning. The formation of the molecular ... -
Highly efficient orange–red electroluminescence from a single layer MEH-PPV-POSS:CdS0.75Se0.25 hybrid PLED
Saygılı, Gamze; Ünal, Gülçin; Özçelik, Serdar; Varlıklı, Canan (Elsevier, 2012-07)In this study, poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] end capped with polyhedral oligomeric silsesquioxanes (MEH-PPV-POSS): cadmium sulfide selenide quantum dots (CdS0.75Se0.25 QDs) ... -
Investigation of structure-spectroscopy-function relationship of twodimensional J-aggregates of tetrachlorobenzimidazolorcarbocyanine preferentially oriented in poly-vinly-alcohol thin films
Gülen, Demet; Atasoylu, Onur; Özçelik, Serdar (Elsevier, 2009-01)The structure–spectroscopy–function relationship of 1,1 0 ,3,3 0 -tetraethyl-5,5 0 ,6,6 0 -tetrachlorobenzimidazolocarbocyanine (TTBC) aggregates is studied using a combination of experimental and theoretical ...
