Person: TEZEL, SERKAN
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TEZEL
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SERKAN
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Publication Copper-electroplating of biodegradable pcl nanofiber mats(E.u. Printing And Publishing House, 2023-01-01) Tezel, Serkan; TEZEL, SERKAN; Gebizli, Şebnem Düzyer; DÜZYER GEBİZLİ, ŞEBNEM; Jadouh, Ahd; KORAL KOÇ, SERPİL; Peksöz, Ahmet; PEKSÖZ, AHMET; Mühendislik Fakültesi; Tekstil Mühendisliği Bölümü; 0000-0003-3737-5896; 0000-0002-0739-8256; C-5123-2013; AFZ-8325-2022; AFO-0698-2022In this study, biodegradable polycaprolactone (PCL) nanofibers were copper (Cu) electroplated in a more environmentally friendly bath compared to conventional electroplating baths. The Cu-plating mechanism and determination of the optimum parameters for the production of Cu-plated PCL nanofiber mats were explained. PCL nanofibers were produced on metal frames by electrospinning. Cu-electroplating needs a conductive surface. To provide this, a gold/palladium (Au/Pd) mixing was sputtered on the PCL samples with different sputtering thicknesses (1-5-10-15 and 20 nm). After determining the minimum sputtering thickness as 5 nm, the samples were Cu-plated for 1, 3, 5, and 30 minutes in a citric acid electroplating bath. The surface properties of the samples were evaluated after Au/Pd sputtering and electroplating, respectively. Elemental analyses, mapping, and electrical characterizations were also performed after electroplating. After Au/Pd sputtering, the SEM images showed that randomly aligned nanofibers with an average diameter of 223 nm were produced. After electroplating, the average nanofiber diameters increased up to 444 nm. It was seen that the coating grew along the surface of the single nanofibers indicating a smooth Cu coating. While elemental analyses presented a Cu content of 79.77%, electrical characterizations gave a sheet resistance value of 5.98 m Omega/sq for the samples Cu-plated for 30 minutes, indicating a highly conductive structure. Every step of the study is described in detail to provide insight for further studies.Publication Influence of knitting structure and metal wire amount on electromagnetic shielding effectiveness of knitted fabrics(E.u. Printing And Publishing House, 2023-01-01) Vandenbosch, Guy A. E.; Volski, Vladimir; TEZEL, SERKAN; KAVUŞTURAN, YASEMİN; Mühendislik Fakültesi; Tekstil Mühendisliği Bölümü; 0000-0003-4078-8210; C-5123-2013; A-7462-2018In this study, the influence of knitting structure and metal wire amount on the electromagnetic shielding effectiveness (EMSE) of knitted fabrics were investigated comparatively. Single jersey, single pique, weft locknit, and cross miss fabrics involving stainless steel or copper wires were produced on a flat knitting machine. In order to measure the EMSE, a free space measurement method was used in an anechoic chamber because of its high reproducibility and accuracy. The variance analysis results of the EMSE values showed that knitting structure, metal wire type, metal wire amount, and incident wave frequency is highly significant. It was observed that fabrics with tuck and miss loop structures had higher EMSE values than single jersey fabrics. Also, single pique fabrics had higher EMSE than single jersey fabrics that contain twice as much metal wire. It indicates that the knitting structure has a great effect on EMSE rather than the amount of the conductive material.Publication Comparison of poisson's ratio measurement methods: The extensometer and the universal tensile testing devices(Ege Universitesi, 2021-01-01) Tiritoğlu, Mehmet; Tezel, Serkan; Kavuşturan, Yasemin; TİRİTOĞLU, MEHMET; TEZEL, SERKAN; KAVUŞTURAN, YASEMİN; Mühendislik Fakültesi; Tekstil Mühendisliği Bölümü; 0000-0002-9919-564X; 0000-0002-2316-0782; 0000-0003-4078-8210; C-5123-2013; ABI-8400-2020; A-7462-2018Auxetic materials with a negative Poison's ratio (PR) have the potential to meet the demand for different materials, especially technical textiles. Universal Tensile Test (UTT) devices and various experimental setups developed by researchers have been used in PR measurements. This study aims to investigate the PR of knitted fabrics with UTT and extensometer devices comparatively by using the same measurement parameters according to ASTM E132. Knitted fabrics with zigzag and foldable patterns were produced in the study because of their auxetic behaviour. It has been determined that the extensometer device can be used as an alternative to the UTT device for PR measurements. While the PR of foldable fabrics cannot be measured with the UTT device because of the fabrics' folding on themselves, it has been observed that it can be easily measured with the extensometer device thanks to the horizontal axis principle.Publication Influence of solvent system on the optoelectrical properties of pcl/carbon black nanofibers(Taylor & Francis Inc, 2022-01-04) Peksöz, Ahmet; PEKSÖZ, AHMET; Gebizli, Şebnem Düzyer; DÜZYER GEBİZLİ, ŞEBNEM; Cunayev, Şaban; Tezel, Serkan; TEZEL, SERKAN; Koç, Serpil Koral; KORAL KOÇ, SERPİL; Mühendislik Fakültesi; Tekstil Mühendisliği Bölümü; 0000-0003-3737-5896; 0000-0002-0739-8256; AFZ-8325-2022; C-5123-2013; AFO-0698-2022In this study, conductive and transparent polycaprolactone (PCL)/carbon black (CB) nanofibers are produced by electrospinning. In order to investigate the effect of solvent system on the optoelectrical properties of PCL/CB nanofibers, the fibers are produced from two different solvent systems; namely, chloroform (CHL) and dimetyl formamid (DMF). For optoelectrical characterization, nanofibers are produced with different deposition times in the range of 1-10 minutes. Surface, optical, electrical and optoelectrical properties of the PCL/CB nanofibers are evaluated. Nanofibers produced from CHL solvent system results in non-uniform nanofibers with higher diameters. They also give a larger diameter distribution. On the other hand, nanofibers with uniform and smaller diameters are obtained from DMF system. UV-spectrophotometer analysis show that nanofiber mats produced from both solvent systems have similar optical transparencies. Lower sheet resistance values are obtained with the nanofiber mats produced from DMF system according to electrical characterizations. Higher Figure of Merit values are calculated for the nanofiber mats produced in DMF solvent system. Considering all the results, it can be concluded that PCL/CB nanofibers produced from DMF solvent system are better candidates compared to the nanofibers produced from CHL solvent system for optoelectrical applications.