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Öğe Biocompatible multi-walled carbon nanotube-CdTe quantum dot-polymer hybrids for medical applications(ELSEVIER SCIENCE BV, 2015) Baslak, Canan; Kars, Meltem Demirel; Karaman, Mustafa; Kus, Mahmut; Cengeloglu, Yunus; Ersoz, MustafaHerein we report the synthesis of polymer coated quantum dots (QDs)-carbon nanotube composite material with high biocompatibility and low cellular toxicity. The synthesized multi-walled carbon nanotube (MWCNT)-QD-(-poly(glycidyl methacrylate)) (pGMA) hybrids were characterized using X-ray photoelectron spectroscopy, laser scanning confocal microscopy, transmission electron microscopy and scanning electron microscopy. The results showed that quantum dots were well-distributed on nanotube surfaces in high density. The toxicological assessments of QDs and MWCNT-QD-polymer hybrids in human mammary carcinoma cells and their fluorescence imaging in living cell system were carried out. MWCNT-QD-polymer hybrids possess intense red fluorescence signal under confocal microscopy and good fluorescence stability over 6-h exposure in living cell system. The toxicity comparison of QDs and MWCNT-QD-polymer hybrids has shown that the existence of PGMA thin coating on MWCNT-QD hybrid surface decreased the cellular toxicity and increased biocompatibility. (C) 2014 Elsevier B.V. All rights reserved.Öğe A Bodipy-bearing pillar[5]arene for mimicking photosynthesis: Multi-fluorophoric light harvesting system(PERGAMON-ELSEVIER SCIENCE LTD, 2018) Kursunlu, Ahmed Nuri; Baslak, CananHerein, we submitted to the original synthesis, characterization, energy transfer mechanism of the Bodipy-bearing pillar[5]arene Bodipy and its reactants by employing of infrared, H-1, B-11, C-13, F-19- NMRs, UV-vis, fluorescence spectroscopy, melting point apparatus, CHN elemental analysis and mass spectroscopy. Preliminary UV-vis, fluorescence and excitation measurements were carried out in CH2Cl2 and the results revealed an effective fluorescence resonance energy transfer (FRET) system based on the interaction of pillar[5]arene and Bodipy derivative. epsilon(max) of target molecule reached to a maximum value and it was found as 955 000 M-1 cm(-1). This fluorescent macromolecule worked well for mimicking a light harvesting system with an energy transfer efficiency up to 92%. (C) 2018 Elsevier Ltd. All rights reserved.Öğe A comparative study on fluorescence quenching of CdTe nanocrystals with a serial of polycyclic aromatic hydrocarbons(ELSEVIER SCIENCE BV, 2014) Baslak, Canan; Kus, Mahmut; Cengeloglu, Yunus; Ersoz, MustafaWe report sensing different polycyclic aromatic hydrocarbons (PAHs) with colloidal CdTe nanocrystals. The effect of molecular structure on quenching rate for 2-hyroxy-1-naphthaldehyde (2H-1N), 9,10-phenanthraquinone (PQ), 9-anthracenecarboxaldehyde (9-AC) and quinoline (Q) is presented. The quenching rate constants are observed to be strongly dependent on the molecular structure. PQ consisting of two carbonyl groups, shows the highest rate constant while Q shows the worst one. Both static and dynamic quenching are simultaneously observed for PQ and 2H-1N. Therefore extended Stern-Volmer equations are used to calculate rate constants. Results showed that dynamic quenching is a dominant process. The rate constants for PQ 2H-1N, 9-AC and Q are calculated to be 64.84, 10.73, 10.66 and 1.85 respectively. (C) 2014 Elsevier B.V. All rights reserved.Öğe Electrospun Nanofibers with CdTe QDs, CdTeSe QDs and CdTe/CdS Core-shell QDs(IEEE, 2017) Baslak, Canan; Koysuren, Ozcan; Kus, Mahmut[Abstract not Available]Öğe Removal of Rhodamine B from water by using CdTeSe quantum dot-cellulose membrane composites(ROYAL SOC CHEMISTRY, 2016) Baslak, Canan; Arslan, Gulsin; Kus, Mahmut; Cengeloglu, YunusFacilitated transport of Rhodamine B through a novel polymer inclusion membrane (PIM) containing CdTeSe Quantum Dots (QDs) as a carrier reagent has been investigated. The prepared PIM was characterized with Fourier transform infrared (FT-IR) spectroscopy, Atomic Force Microscopy (AFM), confocal microscopy, X-ray Photoelectron Spectroscopy (XPS) and fluorescence spectroscopy (PL) techniques and contact angle measurements. The transport was observed by the increased absorbance peak of the stripping phase by UV-visible and fluorescence spectrophotometer. The transport efficiency of Rhodamine B was observed to be 60% after 6 h under optimized conditions. When the feed phase contained 0.005% Rhodamine B at pH 12.19, Rhodamine B was transported through the PIM (prepared with 0.1% CdTeSe QDs) by using 1 M HCl as a stripping phase. The results also showed that the transport efficiency of the PIM was reproducible and it could be beneficial in long-term separation processes.Öğe Synthesis of a Novel Thiadiazine Derivative and Electrochemical Properties for Pb2+ Transfer across Water/1,2-Dichloroethane Interface(PEKING UNIV PRESS, 2011) Baslak, Canan; Bingol, Haluk; Coskun, Ahmet; Atalay, TevfikThe transfer of Pb2+ facilitated by interfacial complexation with 5-(4-phenoxyphenyl)-6H-1,3,4-thiadiazin-2-amine (PPTA) at the polarized water/1,2-dicholoroethane (1,2-DCE) interface was investigated by cyclic voltammetry. We synthesized the thiadiazine derivative, PPTA, firstly. The transfer was performed at different metal concentrations and scan rates, and the obtained voltammetric transfer peaks toward Pb2+ ion over other divalent cations (Zn2+, Co2+, Ni2+, Cd2+, Hg2+, and Cu2+) were reversible. The dependence of the half-wave potentials of the Pb2+ ion on the concentration of PPTA in the organic phase indicates that the ion transfer is facilitated by the formation of 1:2 (metal: ligand) complex in the organic phase with the association constant (Ig beta(2)) of (17.1 +/- 0.2).Öğe Voltammetric determination of facilitated ion transfer across the water/1,2-dichloroethane interface(PLEIADES PUBLISHING INC, 2014) Baslak, Canan; Atalay, TevfikThe facilitated transfer characteristics of Cd2+ ion by 4-morpholinoacetophenone-4-ethyl-3-thiosemicarbazone (MAPET) across water/1,2-dicholoroethane (1,2-DCE) interface and its electrochemical properties were investigated by voltammetric measurements. Cyclic voltammetry (CV) was employed to examine the transfer in the conditions of the ligand (organic phase) in excess and the obtained transfer peaks have reversible nature at different metal concentrations and scan rates. The dependence of the obtained half-wave transfer potential on MAPET concentration showed that the equilibrium is effectively displaced towards a 1: 3 (Cd2+: ligand) stoichiometry with an association constant of log beta (3) (0) = 12.96 +/- 0.09 for the Cd2+ ion, corresponding to the TIC/TID mechanism.
