25 results on '"Yüksel, Behiye"'
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2. Düşük dereceli ısı depolanması amacıyla MgCl2 ve LiNO3 emdirilmiş vermikülit tabanlı kompozit yapıların sentezi ve karakterizasyonu.
- Author
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AYAN, Esra, YÜKSEL, Behiye, and ORHAN, Gökhan
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ENERGY storage , *ENERGY density , *COMPOSITE structures , *COMPOSITE materials , *HEAT exchangers , *HEAT storage - Abstract
In recent years, Thermochemical Heat Storage (THS) systems and storage materials are important for the development of these systems have attracted a great interest. In this study, composite materials were prepared by impregnating sorbent salts (MgCl2, LiNO3) into vermiculite (V). The cyclical heat storage behaviors of the obtained composite structures were investigated with the laboratory scale thermochemical heat exchanger prototype system. Accordingly, the stability of the V+MgCl2 composite during repeated cycles and the energy storage density (Ed) value calculated as a result of the measurements in the prototype were found to be higher than the V+LiNO3 composite, as in the DSC analysis results. [ABSTRACT FROM AUTHOR]
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- 2024
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3. Synthesis and characterization of salt-impregnated anodic aluminum oxide composites for low-grade heat storage
- Author
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Yilmaz, Bengisu, Yüksel, Behiye, Orhan, Gökhan, Aydin, Devrim, and Utlu, Zafer
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- 2020
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4. Isıl İşlemin Akımsız Ni-B/Ni-B-W Dubleks Kaplamanın Korozyon Direncine Etkisinin Analiz Edilmesi
- Author
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DİL, Gökçe, primary, GÖKSENLİ, Ali, additional, YÜKSEL, Behiye, additional, and MUHAFFEL, Faiz, additional
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- 2020
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5. Corrosion resistance of as-plated and heat-treated electroless dublex Ni-P/Ni-B-W coatings: Korozijska odpornost platiranih in neelektrično topolotno obdelanih dupleks Ni-P/Ni-B-W prevlek
- Author
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Baştan, Fatih Erdem, Erdogan, Garip, Yildiz, Ahmet, and Yüksel, Behiye
- Published
- 2017
6. Effect of artificial aging on hardness and intergranular corrosion of 6063 Al alloy
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Yüksel, Behiye, primary
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- 2017
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7. Results of 2nd and 3rd stage risk assessments in a private hospital
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Sezen, Erengül, primary and Yüksel, Behiye, additional
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- 2017
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8. Electroless Ni-B-W coatings for improving hardness, wear and corrosion resistance: Nanašanje Ni-B-W s cementacijskim galvaniziranjem za izboljšavo trdote, obrabe in odpornosti proti koroziji
- Author
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Aydeniz, Ali Imre, Calli, Cagdas, Dil, Gökce, Göksenli, Ali, Muhaffel, Faiz, and Yüksel, Behiye
- Abstract
In this study the formation of a Ni-B-W coating on steel using an electroless plating process and evaluation of the hardness, wear and corrosion resistance was analyzed. The Ni-B-W coating was prepared using an alkaline borohydride-reduced electroless nickel bath. Scanning electron microscopy (SEM) of the cross-sectional view of the Ni-B-W coating was analyzed and the layer characteristics were investigated. The Ni-B-W coating was characterized using XRD. The study reveals that the Ni-B-W coating is amorphous in the as-plated condition and after heat treatment at 450 °C for 1 h the Ni-B-W coatings crystallize and produce nickel and nickel borides. The hardness of the as-plated and heat-treated Ni-B-W coatings were compared with Ni-B coatings. In both coatings the hardness increased with heat treatment. The wear resistance of Ni-B-W coatings annealed at different temperatures was analyzed using a ball-on-flat test. The wear resistance of the coating increased with heat treatment and reached a maximum value at 400 °C. An optical microscope and EDS analysis were applied on the wear tracks to determine the wear mechanism. Ductile failure and an abrasive wear mechanism were dominant for the coating heat treated up to 400 °C. Network cracks and shearing marks were detected for the coatings annealed at 450 °C and above, indicating brittle failure. For investigating the corrosion characteristics of the coatings, immersion tests in 5 % H2SO4 and 10 % HCl acidic solutions for seven days were applied. According to the corrosion test results, the Ni-B-W coatings showed good corrosion resistance in the H2SO4 solutions. V tej študiji je bil analiziran postopek cementacijskega galvaniziranja za nanašanje Ni-B-W na jeklo in analizirana je bila trdota, obraba in korozijska odpornost. Nanos Ni-B-W je bil pripravljen z uporabo alkalne z borhidridom reducirane cementacijske galvanske kopeli niklja. Z vrstičnim elektronskim mikroskopom (SEM) je bil analiziran prečni prerez nanosa Ni-B-W in preiskane so bile značilnosti plasti. Nanos Ni-B-W je bil karakteriziran z XRD. Študija je odkrila, da je nanos Ni-B-W amorfen v nanesenem stanju, po toplotni obdelavi pri 450 °C, 1 h je bil nanos Ni-B-W kristaliziran in nastali so nikelj in nikljevi boridi. Primerjani sta bili trdota nanesenega in toplotno obdelanega nanosa Ni-B-W. V obeh primerih je trdota narastla s toplotno obdelavo. S preizkusom s kroglico na ploskvi je bila preizkušena obrabna odpornost nanosa Ni-B-W, žarjenega pri različnih temperaturah. Odpornost proti obrabi se je povečevala s toplotno obdelavo in je dosegla najvišjo vrednost pri 400 °C. Svetlobni mikroskop in EDS-analiza sta bila uporabljena na obrabljeni tečini, da bi ugotovili mehanizem obrabe. Žilav prelom in mehanizem abrazijske obrabe sta prevladovala pri nanosu, segretem do 400 °C. Pri nanosu, segretem na 450 °C in višje, se je pojavila mreža razpok in znaki striženja, kar kaže na krhek prelom. Za ugotavljanje korozijskih lastnosti so bili uporabljeni preizkusi s potapljanjem sedem dni v raztopino 5 % H2SO4 in 10 % HCl. Pri korozijskem preizkusu je nanos Ni-B-W pokazal dobro korozijsko odpornost v raztopini H2SO4.
- Published
- 2013
9. 6063 alüminyum alaşımının sertliği ve taneler arası korozyonu üzerine suni yaşlandırmanın etkisi.
- Author
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YÜKSEL, Behiye
- Abstract
In this study, the effect of artificial aging on hardness and the corrosion properties of 6063 Al alloy was investigated. Time and temperature play a very important role in the precipitation hardening process of the Alalloy. The results show that the variation in time and temperature have changed the hardness of aluminum alloy. Corrosion test revealed that the corrosion resistance of the alloy strongly depended on artificial aging times. The highest corrosion resistance for all artificial aging temperatures was observed at obtained the highest hardness value. [ABSTRACT FROM AUTHOR]
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- 2017
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10. Photocatalytical Antibacterial Activity of Mixed-Phase TiO2Nanocomposite Thin Films againstAggregatibacter actinomycetemcomitans
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Yeniyol, Sinem, primary, Mutlu, Ilven, additional, He, Zhiming, additional, Yüksel, Behiye, additional, Boylan, Robert Joseph, additional, Ürgen, Mustafa, additional, Karabuda, Zihni Cüneyt, additional, Basegmez, Cansu, additional, and Ricci, John Lawrence, additional
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- 2015
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11. Ni-fe-b Ve Co-ni-fe-b Üçlü Ve Dörtlü Alaşımların Elektrolitik Olarak Kaplanması
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Yüksel, Behiye, Çakır, Ali Fuat, Malzeme, Materials, and Metalurji ve Malzeme Mühendisliği Ana Bilim Dalı
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Metalurji Mühendisliği ,Anomalous Deposition ,Alloy Plating ,Magnetic Properties ,Elektrokaplama ,Manyetik Özellikler ,Magnetic properties ,Metallurgical Engineering ,Alaşım Kaplama ,Electroplating ,Anormal Kaplama - Abstract
Tez (Doktora) -- İstanbul Teknik Üniversitesi, Fen Bilimleri Enstitüsü, 2008, Thesis (PhD) -- İstanbul Technical University, Institute of Science and Technology, 2008, Bu çalışmada, elektrokaplama prosesi ile üretilen NiFeB ve CoNiFeB alaşımlarında film bileşimi, kristal yapı, tane boyutu ve manyetik özellikler üzerine çözelti bileşimi ve deney şartlarının (akım yoğunluğu, ton, toff ve işlem süresi) etkileri araştırılmıştır. İnce filmlerin kristal yapıları X-ışınları difraksiyonu (XRD) ile belirlenmiştir. Film bileşimlerini analiz etmek için, r.f. GD-OES (Radio Frequency Glow Discharge Optical Emission Spectroscopy) cihazı kullanılmıştır. Kaplamaların yüzey topografileri, AFM ve FE-SEM cihazları ile görüntülenmiştir. Filmlerin mayetik özellikleri (Bs (doyurma akış yoğunluğu ) ve Hc (manyetik enerjiyi koruyabilirlilik)) ise titreşimli numune magnetometresi kullanılarak ölçülmüştür. Bu çalışama kapsamında NiFeB ve CoNiFeB üçlü ve dörtlü alaşımları elektrolitik olarak üretilmiş, kaplama parametreleri ile iç yapı değişimleri ve iç yapı değişimleri ile manyetik özellik ilişkileri araştırılmıştır., In this study, NiFeB and CoNiFeB alloys have been produced with electroplating process and the effects of solution composition and experimental conditions (current density, ton, toff and duty cycle) on the chemical composition of the film, on its crystal structure, grain size and magnetic properties have been investigated. The crystal structures of the thin films were examined with XRD (X-Ray Diffraction). Rf. GDOES (Radio Frequency Glow Discharge Optical Emission Spectroscopy) is used to analyze the film composition. The surface topography of the coatings was evaluated by AFM and FE-SEM. The magnetic properties (Bs (saturation magnetic flux density) and Hc (coercivity)) of the films were measured using a vibrating sample magnetometer. In this work NiFeB ternary and CoFeNiB quaternary alloys are produced by electroplating and relation between plating parameters and internal structure and internal structure with magnetic properties are investigated., Doktora, PhD
- Published
- 2008
12. Antibacterial Activity of As-Annealed TiO2Nanotubes Doped with Ag Nanoparticles against Periodontal Pathogens
- Author
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Yeniyol, Sinem, primary, He, Zhiming, additional, Yüksel, Behiye, additional, Boylan, Robert Joseph, additional, Ürgen, Mustafa, additional, Özdemir, Tayfun, additional, and Ricci, John Lawrence, additional
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- 2014
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13. Heat Treated and As-Plated Electroless Duplex Ni-P/Ni-B Coatings: Evaluation of Hardness and Wear Resistance
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Dil, Gökce, primary, Göksenli, Ali, additional, Calli, Cagdas, additional, Muhaffel, Faiz, additional, Aydeniz, Ali I., additional, Yildiz, Ahmed, additional, and Yüksel, Behiye, additional
- Published
- 2013
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14. Temperature dependence of the bulk modulus of MgCNi3 in the normal state below room temperature.
- Author
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ÖZKAN, HÜSNÜ and YÜKSEL, BEHIYE
- Subjects
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MAGNESIUM compounds , *BULK modulus , *METALS at low temperatures , *SUPERCONDUCTORS , *THERMAL properties of metals , *PEROVSKITE - Abstract
Our previous article (Özkan, Philos. Mag. 2014) described a practical method to determine temperature dependence of the bulk modulus by using pressure dependence of the bulk modulus and the related analytical equations. The present study extended the method at low temperatures to obtain the bulk modulus of the superconducting peroxide MgCNi3, below room temperature. The bulk modulus of MgCNi3, decreases with temperature at a rate less than -0.008 GPa/K below 100K, then it decreases at a higher rate, -0.020GPa/K near 300 K, being close to corresponding theoretical values for the other non-oxide perovskites. Moreover, the Gruneisen parameter of MgCNi3, decreases from 300 K to 120 K, goes through a minimum and increases at lower temperatures. The thermal pressure, otvKT gradually increases from 1.1 MPa/K at 40 K to 2.0 at 100K then, increases with slightly reduced rate to 4.9 MPa/K at 300 K being in reasonable agreement with the related data in the literature. This study verifies that the outlined method may be used to predict bulk moduli data below room temperature to substantiate the related studies. [ABSTRACT FROM AUTHOR]
- Published
- 2016
15. Armatür üreten bir işletmede kaplama evresinin kalite güvence kapsamında kontrol optimizasyonu
- Author
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Yüksel, Behiye, Taptık, İsmail Yılmaz, and Metalurji Mühendisliği Ana Bilim Dalı
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Coating ,Metalurji Mühendisliği ,Armature ,Metallurgical Engineering ,Quality control ,Quality assurance system - Abstract
Kalite Güvence kavramı, gerek üretim yapan firmalarda gerekse hizmet sektöründe faaliyet gösteren işletmelerde son yıllarda giderek artan bir ilgi görmektedir. Kalite olgusundaki gelişme sonucunda anlaşılmıştır ki kalite, işletmede tek bir departmanın işi değildir, aksine işletmede en üst düzeydeki yöneticiden kapıdaki bekçiye kadar herkesin görevidir. İşletmelerde istenen kaliteyi sağlayabilmek için kalite araç ve teknikleri kullanılarak hata oluşumu azaltılır. Bu tez çalışmasında, armatür ürünlerinin hem korozyondan korunması hemde dekoratif amaçla kaplanması prosesinde kalite tekniklerinden biri olan OHTEA çalışması uygulanarak hata oluşumunu en aza indirmek amaçlanmıştır. Tezin ikinci bölümünde metalik kaplama proseslerinden olan bakır-nikel ve krom kaplamalar üzerinde durulmuştur. Bu bölümde, söz konusu metalik kaplamalar için geliştirilen farklı karakterdeki kaplama banyoları hakkında özet bilgi verilmiştir. Çalışmanın üçüncü bölümünde ise kalite kavramı ve bu olgunun tarihsel gelişimi üzerinde durulmuştur. Bölümün son kısmı ise günümüzde işletmeler tarafından hızla benimsenmeye başlanan `Toplam Kalite Yönetimi`ne ayrılmıştır. Bu kısımda klasik yönetim anlayışı ile benimsenmeye yeni başlanan Toplam Kalite Yönetimi anlayışı arasındaki farklar ortaya konulmuştur. Bir sonraki bölümde ise kalite tekniklerinden biri olan OHTEA detaylı olarak ele alınmıştır. Tezin son kısmı uygulamaya ayrılmıştır. Bu bölümde ürün OHTEA çalışması yapılmıştır. OHTEA çalışmasında öncelikle oluşması muhtemel problemler bir araya getirilmiş, bu hataların müşteriyi nasıl etkileyeceği tespit edilmiş ve hataların oluşmaması için alınması gerekli tedbirler üzerinde çalışılmıştır. OHTEA çalışması sonucunda elde edilen veriler doğrultusunda kaplama ünitesinde proses yeniden oluşturulmuştur. The aim of this thesis is to realise the control optimization of the coating department of an armature producing company through quality assurance. The thesis consists of four main chapters. In the first chapter, electrolytic coating has been discussed. The second chapter is related to the quality and quality techniques. In the third chapter, failure mode and effect analysis, quality techniques are analysed. These analysis techniques are also used in the practical part of the thesis. In the last chapter is the practical part of the thesis. The details related to these chapters are presented in the following paragraphs. In the first chapter, the results of the literature survey on the electrolytic coating techniques has been presented. Electrolytic coating techniques are the copper, nickel and chromium coating. In the related chapter; copper cyanide bath, bright type nickel bath and decorative type chromium bath that are available in the manufacturing plant which is practical application has been performed are analysed in more detail. The purpose of the coating is to preserve metals against corrosion and give a decorative appeal. In the second chapter, quality concept, total quality management and quality techniques has been explained. The quality concept has been a popular subject all over the world during the last 50 years. Although the first studies on the quality subject had been made in USA, after the Second World War Japanese companies has became the bigger producers of the high quality. The quality concept has been modified during the years parallel to progression in the World Market. The proof of this idea is that the definition of the quality changed from ` the conflrmence of specification ` to ` customer satisfaction `. The historical development of the quality can be summarised in the following order: H1. Control 2. Statistical process control 3. Total quality control 4. Quality assurance The last step of the historical development of the quality concept is the quality assurance. But quality assurance is not the last point to be reached. Although quality assurance certification is necessary for firms, it is not enough for customer satisfaction in today's world market. It is a step to reach the total quality management preferred by today's firms. The base of the total quality management is human. Each people from top level manager to workers in a company are at the same importance. Because of this reason, in the second chapter, the philosophy of the total quality management has been explained. Total quality management is not an aim, it is the way to manufacture well quality product, lower cost, higher quality and termin. A realise these there target at the same time has to produce the product with minimum failure in the shortest period. To obtain these conditions it is necessary to study in an available plant. In this studies, it has been benefited from quality techniques. Because of this, at the end of the chapter, quality techniques has been discussed. In the third chapter, failure mode and effect analysis techniques (FMEA) are discussed in detail. In this part firstly, the definition of FMEA, has been made. The types of FMEA, details of a FMEA application has been presented. A failure mode and effect analysis is an engineering technique used to define, identify, and eliminate known and/or potential failures, problems, errors, and so on from the system, design, process, and/or service before they reach the customer. There are four types FMEA ; system FMEA, design FMEA, process FMEA, service FMEA. A failure analysis technique is one of the most important early protector in design, service and process which will prevent failures and errors from occurring and reaching the customer. There are three important terms in the application of FMEA. They are; 1. Types of failure ; why does not the product work properly? 2. The reasons of the failure ; how does the costumer effect from the failure? 3. The results of the failure; the origin of the failure It is necessary to apply FMEA on time to get satisfactory results. XUA Failure mode and effect analysis is applied in the following cases:. When new system, products, processes or services are being designed,. In the ease of new development in the existing systems, products, processes or services,. If the new application fields can be found for the new systems, products, processes or services. At the fourth chapter of the thesis, product failure mode and effect analysis application has been performed for copper-nickel-chromium coating process. In the application part of the thesis, failure mode and effect analysis which is one the quality techniques has been used to find the failure types which are common in the plant and to supply more quality preventing to form these type failures. In the study, as a first step origins of the failures for copper-nickel-chromium coating process have been investigated. The effect of these type failures on the customers has been analysed. At the last step of the analysis, types of the precautions needed to be taken to prevent failures and errors have been studied. A good FMEA. Identifies known and potential failure modes. Identifies the causes and effects of each failure mode. Prioritizes the identified failure. Prioritizes the identified failure modes according to the risk priority number (RPN)- the product of frequency of occurrence, severity and detection. Provides for problem follow-up and corrective action. In the practical part of the thesis, process failure mode and effect analysis has been applied on the coating procedure of two different products; zamak and brass. Before the failure mode and effect analysis, to determine common failure types pareto analysis has been conducted. According to the results of the pareto analysis, the following common failure types has been determined: roughness, bad covering, grey plating, pitting, dull coating. In the failure mode and effect analysis, subsequent failure types has been selected with the assistance of the pareto analysis. Depends on this analysis, important failure types are roughness, bad covering and grey plating. The main reason for the roughness type failure observed in the plant, is used casting sand. In the FMEA, the first failure type to be examined is roughness. Lack of some equipments such as ultrasonic degreasing and filtration which are to be used to prevent the roughness type failures. Bad covering and grey plating types failure has been analysed. X1UIn this chapter, the first FMEA has been done for zamak. Firstly, possible failure types can occur in each plating steps during the copper-nickel and chromium coating of zamak has been ordered. After that, the reasons of these failures have been discussed. At the following step, the possible results when these type failure occurred have been defined. At the end of these steps, the first part of the FMEA chart has been filled up. For the bad covering failure type, it has been found that the risk priority number (RPN) must be greater than 50. Also it has been defined that which type of precautions can be applied to decrease the amount of the failure. After the application of these precautions, the second part of the failure mode and effect analysis chart has been filled up and the number of the risk priority number (RPN) for the bad covering failure is very small compared with 50. Thus bad covering type failure has been stopped. The same analysis steps have been applied for brass products. At the end of the forth chapter, some photographs of the failure types are presented. The following failures from FMEA application has been obtained: roughness, bad adhesion, dull coating, grey coating, pitting. The reasons of this failures are the followings: Lack of filtration Anode sludge existing in the solution Solid particles in the coating bath Bath concentration is out of control Insufficient cleaning, pickling and rinsing before coating process Metallic contamination available in the coating bath Organic contamination available in the coating bath High electrical current density during the coating process These are the measures to prevent the occurrence of this type failures: Copper and nickel baths have to be filtered, analytical studies have to be performed with the samples that represent coating bath, baths have to be cleaned periodically against metallic and organic contaminetion. Sufficient electrical currency have to be supplied during the coating process. To check the metallic coating for the elimination of failures, following simple checks can be done, adhesion,abrasive, coating thickness, control with eyes. The aim of this study is to define that quality can not be supplied by controlling of product during the process. XIVThe quality have to be produced during process. Because of this reason, process must be under controlled. Quality tools and techniques for the total quality management are to be used to solve the problems and to development continuously. The trio of high quality, low cost and termin can be reached using the controlled processes. XV 170
- Published
- 1997
16. Photocatalytical Antibacterial Activity of Mixed-Phase TiO2 Nanocomposite Thin Films against Aggregatibacter actinomycetemcomitans.
- Author
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Yeniyol, Sinem, Mutlu, Ilven, Zhiming He, Yüksel, Behiye, Boylan, Robert Joseph, Ürgen, Mustafa, Karabuda, Zihni Cüneyt, Basegmez, Cansu, and Ricci, John Lawrence
- Subjects
BIOCHEMISTRY ,BIOFILMS ,PHYSICAL & theoretical chemistry ,DYES & dyeing ,ELECTROCHEMICAL analysis ,HOST-bacteria relationships ,DENTAL implants ,INTERFEROMETRY ,PHENOMENOLOGY ,NANOPARTICLES ,OPTICS ,SCANNING electron microscopy ,SCATTERING (Physics) ,TITANIUM ,X-rays ,GRAM-negative anaerobic bacteria ,IN vitro studies ,COLONY-forming units assay - Abstract
Mixed-phase TiO
2 nanocomposite thin films consisting of anatase and rutile prepared on commercially pure Ti sheets via the electrochemical anodization and annealing treatments were investigated in terms of their photocatalytic activity for antibacterial use around dental implants. The resulting films were characterized by scanning electron microscopy (SEM), and X-ray diffraction (XRD). The topology was assessed by White Light Optical Profiling (WLOP) in the Vertical Scanning Interferometer (VSI) mode. Representative height descriptive parameters of roughness Rα and Rz were calculated. The photocatalytic activity of the resulting TiO2 films was evaluated by the photodegradation of Rhodamine B (RhB) dye solution. The antibacterial ability of the photocatalyst was examined by Aggregatibacter actinomycetemcomitans suspensions in a colony-forming assay. XRD showed that anatase/rutile mixed-phase TiO2 thin films were predominantly in anatase and rutile that were 54.6 wt% and 41.9 wt%, respectively. Craters (2-5 µm) and protruding hills (10-50 µm) on Ti substrates were produced after electrochemical anodization with higher Rα and Rz surface roughness values. Anatase/rutile mixed-phase TiO2 thin films showed 26% photocatalytic decolorization toward RhB dye solution. The number of colonizing bacteria on anatase/rutile mixed-phase TiO2 thin films was decreased significantly in vitro. The photocatalyst was effective against A. actinomycetemcomitans colonization. [ABSTRACT FROM AUTHOR]- Published
- 2015
- Full Text
- View/download PDF
17. Effect of Annealing Temperature on the Corrosion Resistance of Electroless Ni-B-Mo Coatings.
- Author
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Serin, Ihsan, Göksenli, Ali, Yüksel, Behiye, and Yildiz, Rasid
- Subjects
NICKEL alloys ,MOLYBDENUM alloys ,ANNEALING of metals ,CORROSION resistance ,ELECTROLESS deposition ,BORON alloys ,HEAT treatment ,PROTECTIVE coatings - Abstract
The Ni-B-Mo coating on steel by electroless plating and the evaluation of the morphology and corrosion performance after applying heat treatments at different temperatures for 1 h were investigated in this study. The 25-μm-thick coating was uniform and adhesion between the substrate and the coating was good. The coating consisted of an amorphous-like structure in their as-plated condition, and after annealing at 400 °C for 1 h, crystallized nickel, nickel borides, and molybdenum carbide were formed. Immersion tests in 10% HCl solution and potentiodynamic polarization measurements in 3.5% NaCl aqueous solution were applied to investigate corrosion resistance. The corrosion performance of heat-treated coatings was compared with steel and the as-plated coating. By increasing the annealing temperature, corrosion potential shifted toward a noble direction, corrosion current density decreased and the weight loss of specimens decreased, demonstrating an increase in corrosion resistance. Best corrosion performance was achieved by the coating heat treated at 550 °C . [ABSTRACT FROM AUTHOR]
- Published
- 2015
- Full Text
- View/download PDF
18. Demir grubu alaşımların anormal kaplama davranışına genel bir bakış.
- Author
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Yüksel, Behiye and Fuat Çakir, Ali
- Subjects
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ALLOY plating , *ELECTROPLATING , *MAGNETIC alloys , *THIN film devices , *COATING processes , *PROTECTIVE coatings , *IRON group , *MATERIALS , *MAGNETIC properties - Abstract
Electrodeposition, also known as electroplating, refers to the process where a thin film of metal is deposited onto a conductive substrate under an applied current. The electrodeposition of alloys on a substrate requires the simultaneous deposition of two or more metals. Electrodeposition is both a costeffective and simple method to produce thin film materials (such as NiFe, CoNi, CoFe and NiCoFe). Nickel, cobalt and iron, ( iron-group metals), and their alloys are important engineering materials in many applications because of their unique magnetic, corrosion and wear-resistance, thermophysical and electrocatalytic properties. For example, NiFe and NiCoFe alloys are strong candidates for application in high density magnetic recording heads due to their high saturation flux density and low coercivity. These functional materials are usually prepared by electroplating because this technique is often much cheaper and simpler than other methods. In addition, advantages of electrodeposition include low deposition temperature and the simplicity of the required apparatus. The magnetic properties of these materials are seriously affected by their composition and structure thus, reliable control of these properties for the iron-group alloys is important for their wide applications. The standard equilibrium potentials of Ni, Co, and Fe are -0.25, -0.27, and -0.44 V vs. the normal hydrogen electrode (NHE), respectively. Therefore from a thermodynamic consideration Ni is the most noble of the three metals. On the basis of these values, in normal codeposition, nickel is expected to electroplate preferentially to cobalt and cobalt preferentially to iron. When these metals are plated individually, the kinetics of the electrodeposition of individual metals follows the trend expected from the standard equilibrium potential. However, when Fe is present in the same solution with either Ni, Co or both ions, there is often potential range where the rate of Fe deposition exceeds the rate of Ni and Co deposition occurs. The called anomalous codeposition of iron group metals is characterized by the less noble metal deposition preferentially to the nobler one. In other words, the reduction of nickel is inhibited while the deposition of iron and/or cobalt are enhanced when compared with their individual deposition rates. The study on the anomalous deposition of the irongroup alloys can be traced back to 1927. The mechanism of anomalous codeposition of iron group metals has been studied by many researchers and several hypotheses have been presented in the literature. … [ABSTRACT FROM AUTHOR]
- Published
- 2010
19. Örnek bir örme kumaş sektöründe hazop ve 5*5 uygulamalarının karşılaştırılması
- Author
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Kabakulak, Tüba, Yüksel, Behiye, and İş Sağlığı ve Güvenliği Ana Bilim Dalı
- Subjects
Tekstil ve Tekstil Mühendisliği ,Textile and Textile Engineering ,Risk assesment - Abstract
İş kazalarının artmasıyla iş sağlığı ve güvenliği her geçen gün daha da ön plana çıkmaktadır. İş sağlığı ve güvenliği başta çalışanların güvenliğini olmak üzere üretim ve işletme güvenliğini sağlamak için gerekli olan planlı çalışmaları yapmaktadır. Bu çalışmaların odak noktasında da disiplinli ve düzenli bir şekilde yapılmış olan risk değerlendirmesi yer almaktadır. Yapılan risk değerlendirmesiyle işletme için tehlikeler tespit edilip tehlikelerden kaynaklanan riskin büyüklüğü tahmin edilerek mevcut kontrollerin yeterliliği dikkate alınıp riskin kabul edilir olup olmadığına karar verilmektedir. Gerekli olan düzeltici ve önleyici faaliyetlere karar verilerek iş kazalarının önüne geçilmektedir. Tekstil sektörü ülkemizin lokomotif sektörlerinden biridir. Bu anlamda ihracatınında yüksek olduğu bir sektör olması da önemlidir. Tekstil sektörü kendi içinde geniş bir ürün yelpazesine sahiptir. Böyle önemli bir sektörün üretim aşamalarındaki hususlarda göz ardı edilemez. Makine ağırlıklı olan tekstil sektöründe, sanayi devriminden sonra üretimde hız sağlanırken birtakım sorunlarında artışı gözlemlenmiştir. Sektör içinde makineleşmenin artması ve çalışılan alanlarda daha çok insan bulunmasıyla birlikte iş kazaları ve meslek hastalıkları da artmıştır. Bu durum tekstil için iş sağlığı ve güvenliği önemini ortaya koymuştur. Her ne kadar tekstil sektöründe işverenler iş sağlığı ve güvenliği maliyetlerini fazlalık olarak görüp göz ardı etmeye çalışsalarda devlette bu sektörle ilgili birtakım çalışmalar yapmaktadır. Çalışma ve Sosyal Güvenlik Bakanlığı İş Teftiş Kurulu Başkanlığı tarafından işverenlerin eğitimi ve iş mevzuatından kaynaklanan yükümlülükleri konusunda bilinçlendirilmeleri amacıyla el kitapları serisi arasında ''10 Soruda Tekstil Sektöründe İş Sağlığı ve Güvenliği Önlemleri'' yer almaktadır. Bunun gibi tekstil sektörü için yapılmış başka kaynaklarda vardır. Devletin bu girişimleri tekstil sektörünün bir kısmında önlemek ödemekten ucuzdur mantığını oluşturmuştur. İş kazaları ve meslek hastalıkları yapılan araştırmalar göre %50'sinin kolaylıkla önlenebileceği, %48' inin sistemli bir çalışma ile önlenebileceği, %2'sinin ise önlenemeyeceği ortaya çıkmıştır. Bu sebeple işyerlerinde tehlike kaynakları belirlenebilirse oluşabilecek riskler öngörülebilecek, kontrol altına alınabilecektir. Böylelikle iş kazaları azaltılmış olacak ve tehlikeler ortadan kaldırılabilecektir. Bunu ancak sistemli bir çalışma olan risk değerlendirmesiyle gerçekleştirmek mümkündür. Bu çalışmada da risk değerlendirme metodolojilerinden HAZOP ve 5x5 matris yöntemi kullanılmıştır. Çalışma için tekstil alt sektörlerinden olan örme kumaş imalatı yapan İstanbul'da bir firma seçilmiştir. Mevcut tehlikeler belirlenip tehlikelerin sonuçları ortaya koyulmuş, hafifletici ve önleyici mevcut kontroller var mı diye gözden geçirilmiş ve alınacak önlemler belirlenmiştir. Öncelikle 5x5 matris yöntemi için oluşturulan tablo içinden HAZOP için örnek birkaç tehlike belirlenip HAZOP çalışmasıyla da aynı tehlikeler için risk değerlendirmesi yapılmıştır. With the increase of the occupational accidents, the importance of occupational health and safety is getting to the foreground every day. Occupational health and safety are designed to ensure the safety of production and operation, especially for the safety of employees. The focus of these studies is on disciplined and regular risk assessment. With the risk assessment made, it is determined whether the risk for the enterprise is determined and whether the risk arising from the danger is estimated, the adequacy of the existing controls is considered, and whether it is considered risky. Decisions on necessary corrective and preventive actions are taken and job accidents are prevented.The textile sector is one of the locomotive sectors of our country. In this sense, it is also important that this sector is a sector with a high rate of exports. The textile industry itself has a wide range of products. Such an important sector cannot be ignored in the stages of production. In the machine-weighted textile sector, the speed of production after the industrial revolution has been accelerated, and a number of problems have also been observed. With the increase of mechanization within the sector and the presence of more people in the working areas, work accidents and occupational diseases have also increased. This situation has revealed the importance of occupational health and safety for textile. Although the employers in the textile sector try to ignore the cost of occupational health and safety as a surplus, the state department is doing some studies about this sector. In order to raise awareness of employers' obligations arising from training and labour legislation by the Ministry of Labour and Social Security Labour Inspection Board, `10 Responses to Occupational Health and Safety Precautions in the Textile Sector` is among the handbook series. There are other sources for the textile sector as well. This initiative of the state, in some parts of the textile sector, has created the logic of 'to prevent is cheaper than to pay'. Work accidents and occupational diseases can be prevented easily by 50% according to the researches, 48% can be prevented by systematic study and 2% cannot be prevented. Therefore, if sources of hazards can be identified in the workplace, the risks that may arise can be predicted and controlled. In this way, work accidents will be reduced and hazards can be removed. It is only possible to carry out this with a systematic risk assessment. In this study, HAZOP and 5x5 matrix method were used from the risk assessment methodologies. For the study, a firm was selected in Istanbul, which is a manufacturer of knitted fabrics from the textile sub-sectors. The existing hazards have been identified, the consequences of the hazards set forth, and the measures taken to ensure that there are existing mitigating and preventive controls. First, a few examples of hazards for HAZOP were identified from the table for the 5x5 matrix method, and risk assessments were made for the same hazards with the HAZOP study. 168
- Published
- 2018
20. Boya üretimi yapan işletmelerde risk analizi ve değerlendirmesi; örnek HAZOP ve 5x5 uygulaması
- Author
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Kiliç, Ahmet Ali, Yüksel, Behiye, and İş Sağlığı ve Güvenliği Ana Bilim Dalı
- Subjects
Bilim ve Teknoloji ,Accidents ,Kazalar ,Science and Technology - Abstract
Sanayinin gelişmesi İş Sağlığı ve Güvenliği kültürünün öneminin artmasına sebep olmuştur. Gelişen üretim ekipmanları, büyüyen üretim kapasiteleriyle birlikte artan meslek hastalıkları ve iş kazalarının önüne geçilmesi için belirli düzenlemeler yapılması gereğini doğurmuştur. Ülkemizde 6331 sayılı İŞ Sağlığı ve Güvenliği kanunu ve yönetmelikleri ile birlikte çeşitli düzenlemeler getirilmiştir. Bu kanun kapsamında risk analizi ve değerlendirmesi zorunluluk haline gelmiştir. Örnek çalışmada risk değerlendirme yöntemlerinden HAZOP ve 5x5 Matris Yöntemleri seçilmiştir. Bu iki yöntemde de diğer metodlarda olduğu gibi tehlikeleri belirlemek ve bu tehlikelere karşı önlem alarak olası riskleri ortadan kaldırmak amaçlanmaktadır. Meydana gelebilecek tehlikeli durumları en az etki yaratacak ya da etkisi hissedilmeyecek durumlara dönüştürecek önlemler planlanmaktadır. Bu çalışmada tehlikeli kimyasal maddelerin kullanıldığı tekstil boyası ve haşıl kimyasalı üretimi yapan bir firmada HAZOP ve 5x5 matris metodolojileri kullanılarak risk analizi ve değerlendirmesi süreci uygulanmaya çalışılmıştır. Kullanılan kimyasal maddelerin, makinelerin, araç ve gereçlerin çalışma ortamına ve çevreye verebileceği zararları kaynağında yok ederek çalışanların ve çalışma ortamının güvenliğinin korunabilmesi hususunda iki analiz karşılaştırılarak , her iki analizin aynı firma için nasıl sonuçlar verdiği incelenmiştir. Benzer özellikteki işletmelerde ne gibi önlemler alınması gerektiği konusunda fikir vermesi ve bundan sonraki çalışmalara örnek olması hedeflenmektedir. Bu çalışmada iş sağlığı ve güvenliği alanında yapılmış bilimsel makaleler, tezler ve internet sayfalarından yararlanılmıştır. With the development of the industry, the importance of the Occupational Health and Safety Culture had been increased. Specific arrangement has required to block developing manufacturing equipment, growing production capacity with increasing occupational diseases and work accident. In our country, various regulations have been introduced along with the Law No. 6331 on Occupational Health and Safety and its regulations. Risk analysis and evaluation under this law have become anobligation. In sample study HAZOP and 5x5 Matris methods of risk analysis were selected. In both methods, as in other methods identfy hazards and is aimed to eliminate the potential risks of taking measures against these dangers. Dangerous situations can occur that will create the least impact or effect that will be felt into the state measures are planned. In this study, manufacturing of sizing chemicals and textile dye in a company where used hazardous chemicals risk analysis and assessment evulation process were aimed to be applied with HAZOP and matrix metodology. It is researched that how resulted of both analysis for same the company by comparing two analysis by eliminating the harmful effect that chemical substances, machines, tools and equipment used in source can give to environment and working environment to protect the safety of the employeesand working environment. It aimed to be a model to next studies to advise that how should be provided in similar featured companies. In our study, scientific articles, theses and websites in the field of occupational health and safety were used. 94
- Published
- 2018
21. Avrupa Birliği uyum sürecinde Türkiye'de iş sağlığı ve güvenliği
- Author
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Sezen, Erengül, Yüksel, Behiye, and İş Sağlığı ve Güvenliği Ana Bilim Dalı
- Subjects
Endüstri ve Endüstri Mühendisliği ,Industrial and Industrial Engineering - Abstract
18. ve 19. yüzyılda başlamış olan Sanayi Devriminin gelişmesine parallel olarak iş kazaları ve meslek hastalıklarında görülen artış üzerine yeni önlemler alınmaya gerek görülmüş ve bu önlemler zamanla birçok ülkede yaptırım gücü kazanmış kurumsal yapıların oluşmasını sağlamıştır. Bunlardan biri de 1950'li yıllarda Belçika, Almanya, Fransa, İtalya, Lüksemburg ve Hollanda olmak üzere altı kurucu ülke tarafından kurulan Avrupa Kömür ve Çelik Topluluğu zaman içerisinde Roma Antlaşması'nı imzalayarak ortak bir pazara dayalı Avrupa Ekonomik Topluluğu (AET)'dur.Birçok ülke bu kurumsal yapıya üye olmuş ve gerek yasalara, gerek direktiflere uyum sağlamaya çalışmıştır.Türkiye de bu ülkelerden biridir. Ülkemizde,iş sağlığı ve güvenliği ile ilgili uygulamalar Osmanlı döneminde 1865 yılında Dilaver Paşa Nizamnamesiyle Cumhuriyet ve sonrası dönemde de birtakım kanun ve yönetmeliklerle iyileştirmeye yönelik yer verilmiştir. 1945 yılında Çalışma Bakanlığını kurulması İş güvenliği ve İş sağlığı konusunda en önemli aşama olmuştur.Çalışma ve Sosyal Güvenlik Bakanlığından sonra, İş Sağlığı ve Güvenliği Araştırma ve Geliştirme Enstitüsü Başkanlığı (İSGÜM),İş Teftiş Kurulu Başkanlığı (İTKB), İş Sağliği ve Güvenliği Genel Müdürlüğü (İSGGM), Çalışma ve Sosyal Güvenlik Eğitim Merkezi (ÇASGEM) gibi kurum ve kuruluşlar oluşturulmuştur.4857 sayılı İş Kanununun kabulünden sonra, iş sağlığı ve güvenliği konusunda Avrupa Birliği'ne uyum amaçlanmıştır.Avrupa Birliği'nde yayınlanan politika belgelerine parallel olarak, Türkiye'de de yeni kanunlar, yönetmelikler ve ulusal politika belgeleri yayınlanmış ve 30 Haziran 2012'de 6331 sayılı İş Sağlığı ve Güvenliği Kanunu yayınlanarak yürürlüğe girmiştir. Bu kanun,bütün işyerlerini kapsamı altına alan koruma ve önleme anlayışına yöneliktir. 6331 sayılı İş Sağlığı ve Güvenliği Kanununda, belli tanımlar yapılmış, kapması genişletilmiş, çalışanların ve işverenlerin yükümlülükleri detaylı bir şekilde düzenlenmiştir.Tez çalışmamda,Avrupa Birliği uyum sürecinde Türkiye'de uygulanan iyileştirme aşamaları ,hazırlanan kanun ve ulusal politika belgeleri amaç ve hedefleri incelenerek böylece Avrupa Birliği sürecinde iş sağlığı ve güvenliği konusunda Türkiye'nin mevcut durumu değerlendirilmiştir. Ayrıca Türkiye-Avrupa Birliği ilşikileri, Avrupa Birliği'nde (AB) İş Sağlığı ve Güvenliğinin gelişimi, bu gelişim ile mevzuatın oluşumu, İSG alanında yayınlanmış olan direktifler ve politikalara yer verilmiş bazı avrupa ülkelerinin istatistik verileri karşılaştırılmış ve Avrupa Birliği'nde İş Sağlığı ve Güvenliği uygulamarına örnek ülkeler de dâhil edilmiştir. Bu bilimsel araştırmada Avrupa Birliği'ne uyum sürecinde Türkiye'de İş Sağlığı ve Güvenliği Mevzuatındaki değişiklikler ve Mevzuata uyumlaştırılma süreçleri araştırılmıştır. In parallel with the development of the Industrial Revolution, which began in the 18th and 19th centuries, new precautions had to be taken on the increase in occupational accidents and occupational diseases, and these measures ensured the formation of institutional structures that were sanctioned in many countries over time.One of these is the European Coal and Steel Community (EEC), which was founded by the six founding nations, Belgium, Germany, France, Italy, Luxembourg and the Netherlands, in the 1950s, through the signing of the Rome Interpretation over time. Many countries have become members of this institutional structure and have tried to comply with both the law and the directives. Many countries have joined these working organizations and have tried to comply with both the legislation and the directives. Turkey is one of these countries.Practices related to occupational health and safety in our country In the Ottoman period, in 1865, with Dilaver Pasha Ordinance, the Republic and the post-period were given a place to improve with some laws and regulations. Establishment of the Ministry of Labor in 1945 has been the most important stage of work safety and occupational health.After the Ministry of Labor and Social Security, there are institutions such as the Institute for Occupational Health and Safety Research and Development (ISGÜM), the Labor Inspection Board (İTKB), the General Directorate of Occupational Health and Safety (ISGGM) and the Labor and Social Security Training Center (ÇASGEM) Organizations were established.Following the adoption of the Labor Law No. 4857, The European Union aimed at harmonization with respect to occupational health and safety. Parallel to the policy documents published in The European Union, new laws, regulations and national policy documents were published in Turkey, and on June 30, 2012, numbered 6331 The Law on Occupational Health and Safety came into force. This law is aimed at protection and prevention that covers all businesses. In the Law No. 6331 on Occupational Health and Safety, certain definitions were made, the door was expanded, and the obligations of employees and employers were arranged in detail.In studying the thesis, the aims and targets of the improvement law, prepared law and national policy documents in the European Union harmonization process have been examined so that the current situation of Turkey on occupational health and safety in the European Union process has been evaluated.In addition, Turkey-EU relations, European Union (EU) development of health and safety, the development of legislation, the directives published in the field of OSH and the statistical data of some european countries included in politics have been compared and the European Union has been working on Occupational Health and Safety Examples of applications have been included in the countries. this scientific research, changes in the legislation on occupational health and safety in Turkey and the harmonization processes of the legislation in the EU harmonization process have been investigated. 118
- Published
- 2017
22. Suda çözünür ftalosiyanin bileşiklerinden nanotel yapıdaki malzemelerin eldesi ve özelliklerinin incelenmesi
- Author
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Göktuğ, Özge, Durmuş, Mahmut, Yüksel, Behiye, and Kimya Anabilim Dalı
- Subjects
Chemistry ,Kimya - Abstract
Bu tez çalışmasında, 2,3,9,10,16,17,23,24-oktakis-[(2-merkaptopiridin) ftalosiyaninato] çinko (II) (6), 2,3,9,10,16,17,23,24-oktakis-[(2-merkaptopiridin) ftalosiyaninato] kloro-galyum (III) (7), 2,3,9,10,16,17,23,24-oktakis-[(2-merkaptopiridin) ftalosiyaninato] bakır (II) (8), 2,3,9,10,16,17,23,24-oktakis-[(2-merkaptopiridin) ftalosiyaninato] okso-titanyum (IV) (9) bileşikleri ve bu bileşiklerin kuaterner türevleri olan 2,3,9,10,16,17,23,24-oktakis-[(N-metil-2-merkaptopiridin) ftalosiyaninato] çinko (II) sülfat (10), 2,3,9,10,16,17,23,24-oktakis-[(N-metil-2-merkaptopiridin) ftalosiyaninato] kloro-galyum (III) sülfat (11), 2,3,9,10,16,17,23,24-oktakis-[(N-metil-2-merkaptopiridin) ftalosiyaninato] bakır (II) sülfat (12) ve 2,3,9,10,16,17,23,24-oktakis-[(N-metil-2-merkaptopiridin) ftalosiyaninato] okso-titanyum (IV) sülfat (13) bileşikleri sentezlendi.Ftalosiyanin bileşiklerinin sentezini takiben, elektrokimyasal yöntem ile yüksek yoğunlukta ve homojen dağılımlı anodik alüminyum oksit (AAO) yapıları elde edildi. Nanotel elde edebilmek amacıyla sentezlenen ftalosiyanin bileşiklerinin her biri elektrokimyasal biriktirme yöntemi ile üretilen AAO şablonlarının içerisinde biriktirilerek nanotel yapıdaki ftalosiyanin malzemeler elde edildi.Sentezlenen bileşiklerin yapıları FT-IR, UV-Vis, 1H-NMR, kütle spektrumları ve elementel analiz sonuçları yardımıyla aydınlatıldı. Elde edilen ftalosiyanin nanotellerin yapıları ise AAO şablonların elektrokimyasal biriktirme yönteminin öncesi ve sonrasında FESEM (Alan Emisyonlu Taramalı Elektron Mikroskobu) cihazından elde edilen görüntüler yardımıyla karakterize edildi. In this work, the non-ionic phthalocyanine compounds 2,3,9,10,16,17,23,24-oktakis-[(2-mercaptopyridine) phthalocyaninato] zinc (II) (6), 2,3,9,10,16,17,23,24-oktakis-[(2-mercaptopyridine) phthalocyaninato] chloro-gallium (III) (7), 2,3,9,10,16,17,23,24-oktakis-[(2-mercaptopyridine) phthalocyaninato] copper (II) (8), 2,3,9,10,16,17,23,24-oktakis-[(2-mercaptopyridine) phthalocyaninato] oxo-titanium (IV) (9) and their quaternized derivatives 2,3,9,10,16,17,23,24-oktakis-[(N-methyl-2-mercaptopyridine) phthalocyaninato] zinc (II) sulphate (10), 2,3,9,10,16,17,23,24-oktakis-[(N-methyl-2-mercaptopyridine) phthalocyaninato] chloro-gallium (III) sulphate (11), 2,3,9,10,16,17,23,24-oktakis-[(N-methyl-2-mercaptopyridine) phthalocyaninato] copper (II) sulphate (12), 2,3,9,10,16,17,23,24-oktakis-[(N-methyl-2-mercaptopyridine) phthalocyaninato] oxo-titanium (IV) sulphate (13) were synthesized. Following synthesis of the compounds, close packed evenly distributed anodic alumium oxide (AAO) structures by electrochemical method were fabricated. Finally, each of the metallophthalocyanine compounds were tried to deposit into AAO templates using electrodeposition to achieve phthalocyanine nanowires.The synthesized novel compounds have been characterized by FT-IR, UV-Vis, 1H-NMR, mass spectra and elemental analysis. Also, FESEM was used to characterize phthalocyanine nanowires via anodic aluminium oxide templates before and after electrochemical deposition procedure of the compounds. 125
- Published
- 2016
23. Anodik alüminyum oksitlerin üretilerek ftalosiyanin nanotel üretiminde kullanılması
- Author
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Özer Erdoğan, Pembe, Ahsen, Vefa, Yüksel, Behiye, and Kimya Ana Bilim Dalı
- Subjects
Chemistry ,Metalurji Mühendisliği ,Metallurgical Engineering ,Kimya - Abstract
Bu çalışmada, daha önceden literatürde sentezlenen 2(3),9(10),16(17),23(24)-tetrakis-(dodekan) ftalosiyaninato nikel (II) (5), 2(3),9(10),16(17),23(24)-tetrakis-(dodekan) ftalosiyaninato çinko (II) (6), 2,(3), 9(10),16(17),23(24)-tetrakis-(2-merkaptopiridin)ftalosiyaninato çinko (II) (8), 2(3),9(10),16(17),23(24)-tetrakis-[(N-metil-2-merkaptopiridinftalosiyaninato]çinko(II)sülfat (9), 2,(3),9(10),16(17),23(24)-tetrakis-[(2-merkaptopiridin)ftalosiyaninato]klorogalyum(III)(10) ,2,(3),9(10),16(17) ,23(24)-tetrakis-[(N-metil-2-merkaptopiridin)ftalosiyaninato]klorogalyum(III)sülfat (11) bileşikleri sentezlendi. Ftalosiyanin bileşiklerinin sentezini takiben, elektrokimyasal yöntem ile yüksek yoğunlukta ve homojen dağılımlı anodik alüminyum oksit (AAO) yapıları elde edildi. Son olarak ise ftalosiyanin nanotel elde edebilmek amacıyla sentezlenen ftalosiyanin bileşiklerinin her biri elektrokimyasal biriktirme yöntemi ile üretilen AAO şablonlarının içerisinde biriktirilmeye çalışıldı.Sentezlenen bileşiklerin yapıları IR spektroskopisi ve erime noktaları yardımıyla karakterize edildi. AAO şablonlar ise elektrokimyasal biriktirme prosesi öncesi ve sonrasında FESEM (Alan Emisyonlu Taramalı Elektron Mikroskobu) ve TEM (Geçirimli Elektron Mikroskobu) cihazı ile karakterize edildi.Anahtar Kelimeler: Ftalosiyanin nanotel, AAO, elektrokimyasal biriktirme. In this work, the phthalocyanine compounds available in literature were synhesized 2(3),9(10),16(17),23(24)-tetrakis-(dodecane) phthalocyaninato nickel (II) (5), 2(3),9(10),16(17),23(24)-tetrakis-( dodecane) phthalocyaninato zinc (II) (6), 2,(3),9(10),16(17),23(24)-tetrakis-(2-merkaptopiridin) phthalocyaninato zinc (II) (8), 2(3),9(10),16(17),23(24)-tetrakis-[(N-methyl-2-mercaptopyridine phthalocyaninato] zinc(II) sulfate (9), 2,(3),9(10),16(17),23(24)-tetrakis-[(2-merkaptopiridin) phthalocyaninato] chloro galium(III) (10), 2,(3),9(10),16(17),23(24)-tetrakis-[(N-methyl-2-mercaptopyridine) phthalocyaninato] chloro galium(III) sulfate (11).Following syhthesis of the compounds, close packed evenly distributed anodic aluminum oxide (AAO) structures by electrochemical method were fabricated. Finally, each of the metallophthalocyanine compounds were tried to deposit into AAO templates using electrodeposition to achieve phthalocyanine nanowires.The synthesized compounds have been characterized by IR spectroscopy and melting points of these compounds. Also, FESEM and TEM have been used to characterize anodic aluminum oxide templates before and after electrochemical deposition procedure of the compounds.Keywords: Phthalocyanine nanowire, AAO, electrochemical deposition. 88
- Published
- 2013
24. Photocatalytical Antibacterial Activity of Mixed-Phase TiO2 Nanocomposite Thin Films against Aggregatibacter actinomycetemcomitans.
- Author
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Yeniyol S, Mutlu I, He Z, Yüksel B, Boylan RJ, Ürgen M, Karabuda ZC, Basegmez C, and Ricci JL
- Subjects
- Aggregatibacter actinomycetemcomitans radiation effects, Anti-Bacterial Agents administration & dosage, Anti-Bacterial Agents chemical synthesis, Anti-Bacterial Agents radiation effects, Catalysis radiation effects, Cell Survival drug effects, Light, Nanocomposites radiation effects, Phase Transition, Titanium radiation effects, Aggregatibacter actinomycetemcomitans drug effects, Aggregatibacter actinomycetemcomitans physiology, Nanocomposites administration & dosage, Nanocomposites chemistry, Titanium administration & dosage, Titanium chemistry
- Abstract
Mixed-phase TiO2 nanocomposite thin films consisting of anatase and rutile prepared on commercially pure Ti sheets via the electrochemical anodization and annealing treatments were investigated in terms of their photocatalytic activity for antibacterial use around dental implants. The resulting films were characterized by scanning electron microscopy (SEM), and X-ray diffraction (XRD). The topology was assessed by White Light Optical Profiling (WLOP) in the Vertical Scanning Interferometer (VSI) mode. Representative height descriptive parameters of roughness R a and R z were calculated. The photocatalytic activity of the resulting TiO2 films was evaluated by the photodegradation of Rhodamine B (RhB) dye solution. The antibacterial ability of the photocatalyst was examined by Aggregatibacter actinomycetemcomitans suspensions in a colony-forming assay. XRD showed that anatase/rutile mixed-phase TiO2 thin films were predominantly in anatase and rutile that were 54.6 wt% and 41.9 wt%, respectively. Craters (2-5 µm) and protruding hills (10-50 µm) on Ti substrates were produced after electrochemical anodization with higher R a and R z surface roughness values. Anatase/rutile mixed-phase TiO2 thin films showed 26% photocatalytic decolorization toward RhB dye solution. The number of colonizing bacteria on anatase/rutile mixed-phase TiO2 thin films was decreased significantly in vitro. The photocatalyst was effective against A. actinomycetemcomitans colonization.
- Published
- 2015
- Full Text
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25. Antibacterial Activity of As-Annealed TiO2 Nanotubes Doped with Ag Nanoparticles against Periodontal Pathogens.
- Author
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Yeniyol S, He Z, Yüksel B, Boylan RJ, Urgen M, Ozdemir T, and Ricci JL
- Abstract
It is important to develop functional transmucosal implant surfaces that reduce the number of initially adhering bacteria and they need to be modified to improve the anti-bacterial performance. Commercially pure Ti sheets were anodized in an electrolyte containing ethylene glycol, distilled water and ammonium fluoride at room temperature to produce TiO2 nanotubes. These structures were then annealed at 450°C to transform them to anatase. As-annealed TiO2 nanotubes were then treated in an electrolyte containing 80.7 g/L NiSO4 ·7H2O, 41 g/L MgSO4 ·7H2O, 45 g/L H3BO3, and 1.44 g/L Ag2SO4 at 20°C by the application of 9 V AC voltage for doping them with silver. As-annealed TiO2 nanotubes and as-annealed Ag doped TiO2 nanotubes were evaluated by SEM, FESEM, and XRD. Antibacterial activity was assessed by determining the adherence of A. actinomycetemcomitans, T. forsythia, and C. rectus to the surface of the nanotubes. Bacterial morphology was examined using an SEM. As-annealed Ag doped TiO2 nanotubes revealed intense peak of Ag. Bacterial death against the as-annealed Ag doped TiO2 nanotubes were detected against A. actinomycetemcomitans, T. forsythia, and C. rectus indicating antibacterial efficacy.
- Published
- 2014
- Full Text
- View/download PDF
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