Person: BİRTANE, HATİCE
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BİRTANE
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HATİCE
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Publication Open Access An evaluation of antibacterial properties and cytotoxicity of UV-curable biocompatible films containing hydroxyethyl cellulose and silver nanoparticles(2023-08-01) BİRTANE, HATİCE; Özdemir Y., BİRTANE H., BEYLER ÇİĞİL A.The present study aimed to develop biocompatible film materials with antibacterial and anticancer properties that can be cured with UV rays depending on the thiol-en click reaction mechanism. The synthesized m-Ag NPs were added to formulations containing acrylate functionality HEC, pentaerythritol tetrarkis(3-mercaptopropionate), and photoinitiator at different rates (0, 20, 40, and 60 parts per hundred (phr)). The antibacterial activity of the films was evaluated against S. aureus, P. aeruginosa and E. coli by the disk diffusion test. The antibacterial effect of the films did not form an inhibition zone for the control formulation (Cm-Ag0 ) against bacteria whereas the antibacterial property increased as the Ag NPs content increased in formulations containing m-Ag NPs. The strongest resistance film against the three bacterial species was observed in the Cm-Ag60 formulation with 60 phr silver content, and the inhibition zones for S. aureus, P. aeruginosa, and E. coli were measured as 16.5 ± 0.7, 16.5 ± 2.1, and 16 ± 1.4, respectively. The cytotoxicity of the films against healthy cells and breast cancer cell (MCF-7) lines was investigated with MTT, and it was observed that all films did not cause any inhibition in the structure of the living cell but killed the cells at a high rate in the MCF-7 line. It was mainly observed that the Cm-Ag60 formulation showed 95.576 % cell inhibition against MCF-7. According to these results, it has been predicted that the prepared films will play a vital role in the next generation of cancer treatments.Publication Open Access Preparation of conductive and flame-retardant pu/go/dopo printed films(2022-01-01) BİRTANE, HATİCE; Çiğil A. B., BİRTANE H., ESENTÜRK O.© 2022 Authors.Printed electronics are emerging technology products that we use in every moment of our daily lives. It is used in many fields from health, textile, electronics to communication. Inks with nanometal or organic content can be used in printed electronics. The ability of printed electronics to withstand temperature makes its use widespread in the electronics industry. Main aim of the study is to combine surface modified graphene oxide-based conductive inks with flame retardant materials. In this study, an effective and simple approach for the preparation of polyurethane acrylate (PUA) screen printing ink containing surface modified reduced graphene oxide (rGO) which has flame retardant activity. A new and effective flame-retardant additive; 9,10-dihydro-9,10-oxa-10-phosphaphenanthrene-10-oxide (DOPO), silane coupling agent and reduced graphene oxide was synthesized. In this synthesis, first reduced graphene oxide was modified with (methacryloyloxy)propyltrimethoxysilane, and then reacted with DOPO to obtain a flame-retardant monomer containing P and Si. Based on the successful modification reactions, screen-printing ink containing polyurethane acrylate and different amounts of modified graphene oxide content (0, 5 and 10 wt%) were prepared and screen printed on the paper surface. In addition, coatings were made on the paper surface to determine some the properties. LOI values, thermal properties, contact angle values, conductivity and surface properties of the obtained prints and coatings films were investigated. As a result, conductive screen-printing ink resistant to high temperatures was successfully produced and printed coatings and free films were formed.Publication Open Access Yüksek Hidrofilik Polietilen İmin Kaplamaların Hazırlanması Ve_x000D_ Karakterizasyonu(2019-07-31) ARMAN KANDIRMAZ, EMİNE; Aslı BEYLER ÇİĞİL;Emine ARMAN KANDIRMAZ;Hatice BİRTANE;Memet Vezir KAHRAMANBu çalışmada süperhidrofilik bir kaplama hazırlanması planlanmış ve bu amaçla polietilen imin (PEI),silanlanmış cam yüzey üzerine modifiye edilmiştir; bu cam yüzeyin karakterizasyonları, X-ışını fotoelektronspektroskopisi (XPS), Geçirgenlik spektrumu ve temas açısı ölçümleri ile yapılmıştır. İlk olarak, cam örnekleripiranha çözeltisinde (sülfürik asit:hidrojen peroksit, 7:3) temizlenerek hidroksil fonksiyonelleştirilmiş daha sonra3-glisidiloksipropiltrimetoksisilan (GPTMS) kullanılarak silanlanmıştır. Epoksi modifiye cam örnekleri dahasonra polietilen imin (PEI) çözeltisine daldırılmış ve amin grubu modifiye edilen cam örnekler başarıylahazırlanmıştır. Sonuç olarak GPTMS'nin cam yüzeyine modifikasyonunun başarılı bir şekilde gerçekleştirildiğiXPS ile kanıtlanmıştır. Polietilen imin ile cam yüzeyinin modifikasyonundan sonra, XPS ile amino grubuoluşumu belirlenmiştir. Yüzey hidrofilikliği, su temas açısı (WCA) ölçümleriyle belirlenmiştir. Hiç işlemgörmemiş cam yüzeyin su temas açısı 73,6° olarak ölçülmüş ve amin grupları ile modifiye edilen cam yüzeyin sutemas açısı değeri 11,7° olarak ölçülmüştür. PEI modifiye edilen kaplamanın süperhidrofilik olduğubelirlenmiştir.Publication Open Access Production of ink containing thermochromic dyestuff(2022-01-01) AYDIN URUCU, OYA; BİRTANE, HATİCE; AYDIN URUCU O., BİRTANE H.© 2022 Authors.Security inks are functional inks containing a binder and a special colorant used in money, checks and valuable documents. In security inks, thermochromic dyes, UV emitted, infrared emitted dyes can be used. Thermochromic dyestuffs provide different colors at different temperatures and ensure the requirements in the field of security. Thermochromic inks are generally used in smart packaging applications, high temperature alarms and security inks. Thermochromic dyes are generally metal-containing chemical materials. In this study, ink will be produced for metal surfaces by using commercial thermochromic dyestuff and it will be provided to act as a temperature warning plate. For this purpose, UV spectra of the thermochromic dyestuff was determinate with different temperature. Solvent-based ink with polyurethane binder containing 1; 3; 5% commercial thermochromic substance was produced. Screen prints were made on the metal surface with the produced ink. The color and gloss properties of the prints were measured with a spectrophotometer and glossmeter, respectively, at different temperatures. Print quality and surface properties were determined with an optical microscope. In addition, alkali, nitro, acid resistance tests were carried out. The reusability (color change) number was determined depending on how many temperature changes the print has. As a result, inks that change color at 38 °C with commercial thermochromic material were produced and successfully printed.Publication Open Access Novel bio-based phosphorous-containing UV-curable flame-retardant coatings(2023-01-01) BİRTANE, HATİCE; KAHRAMAN, MEMET VEZİR; Ozman E., Dizman C., BİRTANE H., KAHRAMAN M. V.© 2023, American Coatings Association.In this work, a novel bio-based phosphorus-containing reagent was synthesized and characterized. To obtain a flame retardant agent with acid functionality, 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) and bio-based itaconic acid were first reacted. The synthesized acid then was reacted with glycidyl methacrylate to form a difunctional phosphorus-containing methacrylate flame retardant monomer. The flame retardant monomer was added to a reactive monomer matrix with a photoinitiator to prepare UV-curable coatings. The molecular structure of the flame retardant was confirmed by Fourier-transform infrared-attenuated total reflection spectroscopy and proton nuclear magnetic resonance (1H NMR) spectroscopy. The flame retardant behavior of coatings was determined using limiting oxygen index. Thermal behaviors of the films were studied by thermal gravimetric analysis. Furthermore, scanning electron microscopy/energy-dispersive spectroscopy was used to determine the elemental composition and to observe the morphology of the coatings. The properties (water adsorption, gel content, etc.) of the coatings were also studied. It was found that the addition of DOPO resulted in a significant improvement in the flame retardant and thermal properties of the coatings.Publication Open Access Edible film production with aloe vera extract and its printability(2022-01-01) BİRTANE, HATİCE; BİRTANE H., Beyler Çiğil A.The main concern with protecting fruits and vegetables from bacterial infection and growth is ensuring product quality and safety. Hydroxyethyl cellulose, with –OH in the natural cellulose molecule substituted by a hydroxyethyl group, has been widely used in oil exploitation, coating, medicine, food and polymerization process. It is nontoxic and low-cost. Aloe vera is a well-known herbal plant that is used for its therapeutic properties. The gel extracted from Aloe vera plants contains a variety of biologically active compounds, phenolic contents, and minerals. In this study, the edible films containing different proportions of aloe vera and hydroxyl ethyl cellulose were prepared. The structural and antibacterial properties of the obtained edible films were examined. The obtained films were printed with inkjet. Color and adhesion properties of printed samples were determined and it was observed that the edible films showed antibacterial properties.