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Öğe Biyokirlenmeye karşı yüksek dirençli ve florlanmış membranlı yüksek seçiciliğe sahip yeni elektrokimyasal ve optik amonyum sensörlerin geliştirilmesi(2015) Yılmaz, İbrahim; Henden, Emür; Sezer, Metin; Aksuner, Nur; Çukurovalı, AlaaddinÇeşitli elektrokimyasal sensörlerin geliştirilmesi ve uygulamaları ile ilgili çalışmalar 1960'lı yılların sonlarından beri hızla artarak devam etmektedir. Bu tip sensörler, fizyolojik, biyokimyasal ve biyomedikal çalışmalar, klinik analizler ve çevresel analizler gibi birçok alanda kullanılmaktadır. Bu çalışmada, günümüzde çevresel ve klinik analizlerde en fazla ihtiyaç duyulan, biyokirlenmeye karşı yüksek dirençli, yüksek seçiciliğe sahip ve membran bileşiminde perfloro türlerin bulunduğu yeni elektrokimyasal ve optik amonyum sensörü geliştirilmesi hedeflenmiştir. Bu kapsamda, detayları deneysel kısımda verilen, potasyumun altı koordinasyonlu kompleks oluşturmasını engelleyecek ve amonyum iyonu ile tetrahedral kompleks oluşturabilecek indazol yapılarının bulunduğu iyonoforlar sentezlenmiştir. Ayrıca, elektrokimyasal sensörlerin membran bileşenlerinden olan iyon değiştirici grup olarak perfloro alkil grupları içeren tetrafenil borat tuzları sentezlenmiştir. Sentezlenen bu bileşenler kullanılarak sensörler hazırlanmış ve hazırlanan sensörlerin cevap süresi, tayin limiti, seçiciliği, çalışma aralığı ve kullanım ömrü gibi parametreleri belirlenerek, kan ve idrar gibi biyolojik sıvılarda uygulamaları yapılmıştır. Buna ilaveten geliştirilen sensörlerin performansları, nonaktin, PVC ve florsuz iletkenlik artırıcı tuzlar kullanılarak yapılan klasik mebranlı sensörlerin performansları ile karşılaştırılmıştır.Öğe Development of a Highly Sensitive and Selective Optical Chemical Sensor for the Determination of Zinc Based on Fluorescence Quenching of a Novel Schiff Base Ligand(American Scientific Publishers, 2010) Aksuner, Nur; Henden, Emur; Yılmaz, İbrahim; Çukurovalı, AlaaddinA sensitive new optical sensor for Zn2+ is described. This optode is based on a novel Schiff base ligand, 2-(2-hydroxy-5-chloro)benzaldehyde-[4-(3-methyl-3-mesitylcyclobutyl)-1,3- thiazol-2yl]hydrazone, in plasticized polyvinyl chloride membrane. This sensing membrane is capable of determining Zn2+ with a high sensitivity and selectivity over a wide dynamic range between 5.0×10-7 to 1.0×10-4 mol L-1 at pH 6.0 with a lower detection limit of 2.2×10-7 mol L-1 (14.4 g L-1 . The sensor can readily be regenerated with 1.0 mol L-1 EDTA solution. In addition to high stability, the sensor shows a unique selectivity toward Zn2+ with respect to common metal cations. The sensor was successfully applied for the determination of zinc real samples. The results obtained for the determination of zinc ions in hair samples using the proposed method was found to be comparable with the well-established flame atomic absorption methodÖğe Highly sensitive sensing of zinc(II) by development and characterization of a PVC-based fluorescent chemical sensor(Elsevier, 2011) Aksuner, Nur; Henden, Emur; Yenigül, Berrin; Yılmaz, İbrahim; Çukurovalı, AlaaddinA sensor membrane with excellent performance based on 1-methyl-1-phenyl-3-[1-hydroxyimino-2- (succinimido)ethyl]cyclobutane has been developed for the determination of zinc(II) ions. The sensing membrane is capable of determining zinc(II) with an outstanding high selectivity over a dynamic range between 8.0×10-8 and 1.6×10-4 mol L-1 with a limit of detection of 2.5×10-8 mol L-1 (1.6 gL-1). It can be easily and completely regenerated by using 0.1 mol L-1 EDTA solution. The optical sensor developed here was found to be stable, cost effective, easy to prepare, and has unique selectivity towards Zn2+ ion with respect to common metal ions. The proposed sensor was then applied for the determination of zinc in tap water and hair samples with satisfactory results.Öğe A newly synthesized hydrazone derivative as a fluorescent enhancement chemosensor for sensitive detection of Cd2+ Ions(American Scientific Publishers, 2016) Başaran, Beyza; Aksuner, Nur; Henden, Emur; Yılmaz, İbrahim; Çukurovalı, AlaaddinA highly sensitive chemical sensor procedure for Cd2+ based on fluorescent measurements was accomplished by using of Chloroacetic acid N-[4-(3-methyl-3-phenyl-cyclobutyl)-thiazol-2-yl]-N-pyridin-2-ylmethylene-hydrazide ligand immobilized in PVC films. This membrane gives a linear response in the concentration range between 1.0×10-10 and 1.0×10-5 M with a limit of detection of 7.2×10-11 M at pH 5.5. The membrane can be used over a period of four months with good reproducibility. It is selective over a number of anions and cations and can be regenerated with 0.1 M EDTA solution. The proposed sensor was applied to the determination of cadmium in real water samples. The sensor provides a low cost and fast method for the determination of Cd2+. © 2016 American Scientific Publishers.Öğe A novel optical chemical sensor for the determination of nickel(II) based on fluorescence quenching of newly synthesized thiazolo-triazol derivative and application to real samples(Elsevier, 2012) Aksuner, Nur; Henden, Emur; Yılmaz, İbrahim; Çukurovalı, AlaaddinThe characterization of a new optical sensor membrane is described for the determination of Ni(II) based on the immobilization of the fluorescent thiazolo-triazol derivative in PVC matrix. This optode has a wide linear range of 1.0 × 10-9–4.4 × 10-3M at pH 6.0 for Ni(II) ions with the detection limit of 8.5 × 10-10 M. The response of the optode membrane to Ni(II) is fully reversible and reveals a very good selectivity towards Ni(II) ion over a wide variety of other metal ions in solution. The membrane showed a good durability and short response time with no evidence of reagent leaching. The proposed optical sensor gives good results for applications in direct determination of Ni(II) in real samples that are satisfactorily comparable with corresponding data from flame atomic absorption spectrometryÖğe A sensitive and selective fluorescent sensor for the determination of mercury(II) based on a novel triazine-thione derivative(Elsevier, 2010) Aksuner, Nur; Başaran, Beyza; Henden, Emur; Çukurovalı, Alaaddin; Yılmaz, İbrahimA sensor membrane based on the fluorescence enhancement of a novel triazine-thione derivative, 4-ethyl- 5-hydroxy-5,6-di-pyridin-2-yl-4,5-dihydro-2H-[1,2,4]triazine-3-thione, was capable of determining mercury(II) with high selectivity over the range 5.0 10 10 and 5.0 10 5 mol L 1 with a limit of detection of 1.8 10 10 mol L 1 (0.036 mg L 1). The sensor can be regenerated using 5% thiourea in 1.0 mol L 1 HCl solution. The sensor also displayed unique selectivity toward mercury(II) ion with respect to other common metal cations and was applied to the determination of mercury(II) in tap water and human hair samples. The accuracy of the results were comparable to those obtained by cold vapour atomic fluorescence spectrometry
