EnstitülerInstituteshttps://hdl.handle.net/20.500.12809/32024-03-29T12:13:02Z2024-03-29T12:13:02ZBir Masal Metninin Sonsuz Serüveni: Ali Cengiz Oyunu Çözüldü Mü?Daşdemir, Cansuhttps://hdl.handle.net/20.500.12809/109202023-11-30T06:59:02Z2023-01-01T00:00:00ZBir Masal Metninin Sonsuz Serüveni: Ali Cengiz Oyunu Çözüldü Mü?
Daşdemir, Cansu
Toplumsal ve kültürel kalıpların aktarıcısı olan masallar, sözlü kültürün önemli saç ayaklarından biridir.
2023-01-01T00:00:00ZInvestigation of Structural, Morphological and Photoluminescence Properties of Electrospun Cu@PMMA NanofibersAcar, YaseminGüngör, ElifÇoban, Mustafa BurakKuru, FatmaKara Subaşat, Hülyahttps://hdl.handle.net/20.500.12809/108992023-08-22T08:05:14Z2023-01-01T00:00:00ZInvestigation of Structural, Morphological and Photoluminescence Properties of Electrospun Cu@PMMA Nanofibers
Acar, Yasemin; Güngör, Elif; Çoban, Mustafa Burak; Kuru, Fatma; Kara Subaşat, Hülya
In this work, a tetrameric Cu(II) Schiff base complex [Tetrakis((µ3-N-(3,5-dichlorosalicyclideneamino)ethanolato)-Cu(II))], (1), has been synthesized and structurally characterized by single crystal X-ray diffraction technique. In different concentrations (5–20 wt%), complex (1) has been doped into poly(methylmethacrylate) (PMMA) as the polymer matrix using by electrospinning technique to form Cu@PMMA nanofibers. Both complex (1) and electrospun Cu@PMMA nanofibers were characterized using various techniques including field emission scanning electron microscopy (FESEM), photoluminescence (PL) and Fourier transform infrared (FT-IR) spectroscopy. The photoluminescence (PL) characteristics of Cu@PMMA composite fibers in the solid-state were studied at room temperature. Furthermore, the temperature-dependent PL properties of Cu@PMMA nanofibers, with a weight% of 15%, were investigated within a temperature range of 10–300 K. Cu@PMMA nanofibers exhibited blue emission with excitation wavelength of 349 nm. Brilliant values of the chromaticity coordinates of the prepared photoluminescent nanofibers predict their possible use in blue solid-state lighting applications.
2023-01-01T00:00:00ZStructural, Thermal, Optical and Antibacterial Properties of Co-doped (Dy3+/Eu3+): PEG + PVA Novel Transparent Hybrid FilmsÇoban, Mustafa BurakDiken, Mehmet EminDoğan, SerapKara Subaşat, Hülyahttps://hdl.handle.net/20.500.12809/107892023-06-23T12:33:32Z2023-01-01T00:00:00ZStructural, Thermal, Optical and Antibacterial Properties of Co-doped (Dy3+/Eu3+): PEG + PVA Novel Transparent Hybrid Films
Çoban, Mustafa Burak; Diken, Mehmet Emin; Doğan, Serap; Kara Subaşat, Hülya
In this report, PEG + PVA + Dy3+:Eu3+ films with Eu3+ concentrations of 1–7wt% were prepared by solution casting method and characterized. The composites were characterized by PXRD, FTIR, UV–Vis, DMA, SEM, TGA and photoluminescence measurements, and also their antibacterial activities were tested by the diffusion method. Thermogravimetric analyzes show that increasing Eu3+ content outstandingly increases thermal stability. Moreover, the antibacterial properties of composites showed strong activities against E. coli and S. aureus with the addition of Dy3+ and Eu3+ ions to polymer blends. Optical measurement records presented that the optical band gap Eg progressively decreased from 4.66 eV for the undoped PEG + PVA blend film to 3.18 eV by increasing Eu3+ ions concentration. Charmingly, the room temperature PL results reveal that the enhancement of the emission of Eu3+ ions in the PEG + PVA polymer matrix after co-doping with Eu3+ ions, whereas the reduction of Dy3+ emission intensity, owing to energy migration from Dy3+ to Eu3+. Besides, according with low-temperature PL measurements indicate that the PL density gradually decreases due to thermal quenching as the temperature increases. With the temperature increased, the color coordinates gradually changed from orange to reddish-orange. These results show that Dy3+/Eu3+ doped polymer blends can likely of a promising candidate in varieties of applications including OLEDs, biosensors, polymer solar cells and optoelectronics devices.
2023-01-01T00:00:00Z{[HNC5H4B(OH)(OCH3)-4]2PdCl2} Yeni Bileşiğin Sentezi, Kristal Yapısı ve Hidrojen Bağ ÖzellikleriGüngör, ElifKara Subaşat, Hülyahttps://hdl.handle.net/20.500.12809/103892022-11-17T07:05:30Z2022-01-01T00:00:00Z{[HNC5H4B(OH)(OCH3)-4]2PdCl2} Yeni Bileşiğin Sentezi, Kristal Yapısı ve Hidrojen Bağ Özellikleri
Güngör, Elif; Kara Subaşat, Hülya
Bu çalışmada, yeni bileşik {[HNC5H4B(OH)(OCH3)-4]2PdCl2} sentezlendi ve kristal yapısı belirlendi. Bileşik, monoklinik kristal sisteminde P21/n uzay grubunda a=3.8749 (8) Å, b=10.177 (2) Å, c=20.403 (4) Å, α= γ = 90°, β =91.78° ve Z=2 birim hücre parametrelerinde kristallendi. Bileşikteki Pd iyonu inversiyon merkezinde ve dörtlü bir koordinasyona sahiptir. N–Pd–N* ve Cl–Pd–Cl* açıları 180° olduğu için, Pd iyonu kare düzlem geometriye sahiptir. Bileşikteki CH···O, CH···Cl ve π···π etkileşimleri, bc düzleminde ve a ekseni boyunca 3 boyutlu bir yapı oluşturmaktadır.; In this study, the new compound {[HNC5H4B(OH)(OCH3)-4]2PdCl2} was synthesized and its crystal structure was determined. Compound crystallized in the space group P21/n in the monoclinic crystal system at a=3.8749 (8) Å, b=10.177 (2) Å, c=20.403 (4) Å, α= γ = 90°, β =91.78° and Z=2 units cell parameters The Pd ion in the compound is at the inversion center and has a quaternary coordination. Because the N–Pd–N* and Cl–Pd–Cl* angles are 180°, the Pd ion has a square plane geometry. The CH···O, CH···Cl and π···π interactions in the compound form a 3-dimensional structure in the bc plane and along a axis.
2022-01-01T00:00:00Z