Person: BİRTANE, HATİCE
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BİRTANE
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HATİCE
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Publication Metadata only Covalently bonded nanosilver-hydroxyethyl cellulose/polyacrylic acid/sorbitol hybrid matrix: thermal, morphological and antibacterial properties(SPRINGER, 2022) BİRTANE, HATİCE; Cigil, Asli Beyler; Sen, Ferhat; Birtane, Hatice; Kahraman, Memet VezirIn this study, an antibacterial, biodegradable, biocompatible, and environmentally friendly coating was prepared with an easy technique. Accordingly, Ag nanoparticles were synthesized to provide antibacterial properties to the coating, and its surface was modified with (3-Glycidyloxypropyl)trimethoxysilane (GPTMS) in order not to clump in the coating, to ensure homogeneous distribution on the surface, and to covalently bond to the coating. While preparing the coating formulation, polyacrylic acid (PAA), which are natural polymers, and hydroxyethyl cellulose (HEC), a derivative of cellulose, were preferred to reduce the consumption of petroleum derivatives. Then, sorbitol was used as a plasticizer. Synthesized Ag nanoparticles were included in the coating formulation containing PAA/HEC and sorbitol and thermally crosslinked at a high temperature. The size of Ag nanoparticles was analyzed by DLS while chemical composition after modification was analyzed by FTIR. Then, the chemical structure, thermal properties, surface properties, and antibacterial properties of the environmentally-friendly film were examined. It was observed that Ag nanoparticles, the surface of which were modified with GPTMS containing silicon groups, increased the thermal stability of the film, and the presence of Si and Ag on the surface was detected in SEM-EDAX measurements, and this showed that the aimed coating was obtained. It was observed that silver nanoparticles, of which their surface was modified, incorporated into the coating obtained from PAA and HEC, which are known to have no antibacterial properties, showed antibacterial activity against E. coli and S. aureus. The zone of inhibition was measured as 11 mm for both E. coli and S. aureus.Publication Metadata only Cellulose/cysteine based thiol-ene UV cured adsorbent: removal of silver (I) ions from aqueous solution(SPRINGER, 2021) BİRTANE, HATİCE; Cigil, Asli Beyler; Urucu, Oya Aydin; Birtane, Hatice; Kahraman, Memet VezirIn the present study, a novel, eco-friendly, and simple polymeric adsorbent was obtained from cellulose acetate butyrate (CAB) and cysteine (Cys) to remove silver (I) ions in the presence of a thiol-ene click reaction under UV rays. Accordingly, firstly, CAB was modified with acrylate groups to turn it into a photocurable resin. Then, the acrylate modified CAB obtained with the monomer having cysteine and triacrylate group was crosslinked by thiol-ene click reaction under UV rays to obtain an eco-friendly adsorbent. The adsorbent acquired -S-, -COO and -NH2 groups as a result of this reaction and these functional groups are known to have the ability to selectively couple with Ag(I) ions. The adsorbent was evaluated for the selective removal of Ag(I) ions from aqueous samples characterized by SEM, SEM-EDAX, and FTIR. To determine the most suitable conditions, the effect of important parameters such as pH and contact time was investigated. It was determined that the most suitable isotherm for adsorption was the Langmuir isotherm (R: 0.999). The efficacy of our eco-friendly adsorbent was investigated in a real stream and lake waters and very good results were achieved. [GRAPHICS] .Publication Metadata only Thermal, optical and electrical properties of UV-curing screen-printed glass substrates(SPRINGER, 2019) ARMAN KANDIRMAZ, EMİNE; Cigil, Asli Beyler; Kandirmaz, Emine Arman; Birtane, Hatice; Kahraman, Memet VezirIn this study, the hydroxyl functionality of the polyaniline surface was obtained using hydroxyethyl methacrylate and acrylated with isocyanatoethyl methacrylate. Coating formulation being curable with UV was designed by mixture of acrylated PANI (a-PANI) (0-5wt%), polyethylene glycol diacrylate, trimethylolpropane triacrylate, hydrolyzed 3-(methacryloxy) propyl trimethoxysilane (hydMEMO) and photoinitiator. The hybrid composite formulation has been printed on the glass surface with the method of screen printing. The chemical structure and the properties of thermal, electrical and surface obtained products were determined with ATR-FTIR, goniometer, current-voltage meter, scanning electron microscopy (SEM) and thermogravimetric analysis. ATR-FTIR results have shown that all materials were clearly produced. SEM results have revealed that PANI was dispersed at the composite in a stable manner. The conductivity value of the conductive line printed with F5a-PANI was found to be 3.7x10(-3)S. The best electrical results have presented that PANI has been beneficial for conductive line, and thus, screen printing was a convenient method for printing conductive lines.Publication Metadata only Antibacterial UV-photocured acrylic coatings containing quaternary ammonium salt(SPRINGER, 2021) BİRTANE, HATİCE; Birtane, Hatice; Sen, Ferhat; Bozdag, Buket; Kahraman, Memet VezirThis study aimed to develop UV-curable coating materials showing antimicrobial properties. GTAC was acrylated and characterized by FT-IR and(1)H NMR spectroscopy. UV-curable coating materials with different contents were prepared. Inhibition zone method was used to determine the antimicrobial activity of the materials. Thermal stability of samples was evaluated by TGA. Contact angles of samples were measured to obtain information about their hydrophobicity. Surface morphology of samples was investigated by SEM. Produced UV-curable coating materials have good antimicrobial, thermal and surface properties, and they can be used as antibacterial top coating material in many industries.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 Metadata only Structural and dielectric properties of POSS reinforced polyimide nanocomposites(TAYLOR & FRANCIS INC, 2019) BİRTANE, HATİCE; Birtane, Hatice; Esmer, Kadir; Madakbas, Seyfullah; Kahraman, Memet VezirIn this study, a series of [3-(2-aminoethyl)amino]propyl-heptaisobutyl substituted polyhedral oligomeric silsesquioxane (AHIP) containing polyimide (PI) nanocomposites were successfully prepared. Structural, thermal and electrical properties of the polyimide nanocomposites were studied. The properties of AHIP containing polyimides were compared with those of the neat polyimide films. The surface morphology of the prepared AHIP containing polyimides were determined by using Scanning Electron Microscopy (SEM). The hydrophilic/hydrophobic nature of AHIP/polyimide composites were analyzed by measuring their water contact angles. It was found that the addition of AHIP into the polyimide slightly increased the contact angle values. The incorporation of 5% AHIP to the PI matrix decreased the dielectric constant value of pure PI from 8.6 to 11.7, respectively. Furthermore he dielectric permittivity was changed from 8.6 (neat polyimide) to 5.5 (PI3).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 Metadata only Transparent and flexible antibacterial photocrosslinked thin films against the S. aureus and E. coli pathogen bacteria(ELSEVIER, 2021) BİRTANE, HATİCE; Beyler-Cigil, Asli; Birtane, Hatice; Sen, Ferhat; Kahraman, Memet VezirThe study aims to obtain simple, transparent, and flexible coatings that are produced using an environmentally-friendly method, have either positive or negative charge density on their surfaces, and have antibacterial properties. For this purpose, poly(ethylene glycol) diacrylate (PEGDA), trimethylolpropane triacrylate (TMPTA), and trimethylolpropane tris(3-mercaptopropionate) (TMPTMP) were crosslinked using the thiol-ene click reaction in the presence of UV light. Ammonium salt is known to have antibacterial properties due to its positively charged surface and was added to the coating formulation to positively charge the surface of the glycidyl-trimethylammonium chloride (GTMAC) coating and negatively charge the sodium 3-mercapto-1-propanesulfonate (3-MPS) surface. The thiol-ene click reaction was used in the coatings that were prepared by using the base formulation and adding 3-MPS while the thiol-ene and thiol-epoxy click reactions were used together for the addition of GTMAC to the formulation. The structural characterization of the coatings was made using FTIR, the thermal behaviors of the coatings were determined using thermogravimetric analysis (TGA), and the morphologies and chemical compositions of the coatings were examined using SEM and SEM-EDAX images. The antibacterial activities of the coatings were tested using the inhibition zone method against Gram-positive (Staphylococcus aureus) and Gram-negative (Escherichia coli) bacteria that have different cell wall properties and can serve as models for similar bacteria.Publication Metadata only UV ile kürlenebilen fosfor içeren biyo-esaslı kimyasalların sentezi ve kaplama uygulamaları(2022-09-01) BİRTANE, HATİCE; KAHRAMAN, MEMET VEZİR; OZMAN E., Dizman C., BİRTANE H., KAHRAMAN M. V.Günümüzde polimer malzemelerin yanmazlık seviyesini artırmak için çoğunlukla halojen esaslı katkı maddeleri kullanılmaktadır. Halojen esaslı katkıların insan ve çevre sağlığına olumsuz etkilerinden dolayı alternatif alev geciktiricilere ihtiyaç duyulmaktadır. Petrol türevlerine alternatif biyo-esaslı kimyasalların üretimi sürdürülebilir ekonomi, insan sağlığı ve çevre faktörleri düşünüldüğünde çok önemlidir.Bu çalışmada, yeni bir biyo-esaslı fosfor içeren reaktif sentezlendi ve karakterize edildi. Asit fonksiyonel alev geciktirici bir ajan elde etmek için önce 9, 10-dihidro-9-oksa-10-fosfafenantren-10-oksit (DOPO) ve biyo-esaslı itakonik asit reaksiyona sokuldu. Sentezlenen asit daha sonra iki işlevli fosfor içeren metakrilat alev geciktirici monomer oluşturmak için glisidil metakrilat ile reaksiyona sokuldu. Alev geciktirici monomer, Ultra viyole (UV) ile kürlenebilen kaplamalar hazırlamak için bir foto başlatıcı ile reaktif bir monomer matrisine ilave edildi. Alev geciktiricinin moleküler yapısı, Fourier-Dönüşümlü Kızılötesi-Zayıflatılmış Toplam Yansıma (FTIR-ATR) spektroskopisi ve Proton Nükleer Manyetik Rezonans (1H NMR) ile doğrulandı. Kaplamaların alev geciktirici davranışı Sınırlı Oksijen İndeksi (LOI) kullanılarak belirlendi. Filmlerin termal davranışları termal gravimetrik analiz (TGA) ile incelenmiştir. Ayrıca, temel bileşimi belirlemek ve kaplamaların morfolojisini gözlemlemek için Taramalı Elektron Mikroskobu (SEM)/Enerji Dağılım Spektroskopisi (EDAX) kullanıldı. Kaplamaların özellikleri (su adsorpsiyonu, jel içeriği vb.) de incelenmiştir. DOPO ilavesinin, kaplamaların alev geciktirici ve termal özelliklerinde önemli bir gelişme ile sonuçlandığı belirlenmiştir.Publication Metadata only Selective molecularly imprinted polymer for the analysis of chlorpyrifos in water samples(ELSEVIER SCIENCE INC, 2020) KÖK YETİMOĞLU, ECE; Urucu, Oya Aydin; Cigil, Asli Beyler; Birtane, Hatice; Yetimoglu, Ece Kok; Kahraman, Memet VezirIn this paper, a new molecularly imprinted solid-phase extraction (MISPE) method was described for the determination of the chlorpyrifos in water samples. A thiol-ene based UV-cured polymer was prepared by mixing glyoxal bis (-diallyl acetal), pentaerythritol tetrakis (3-mercaptopropionate), polyethylene glycol diacrylate (PEGDA), and photoinitiator. Chlorpyrifos was added to the prepared polymer as a template analyte, and its analysis was performed by gas chromatography with mass detection (GC-MS). The influence of some analytical parameters was studied. We found that the use of the molecularly imprinted polymer (MIP) UV-cured disc provides an easy, selective, and available solution for removing chlorpyrifos from water samples. (C) 2020 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.