Person: KORAL KOÇ, SERPİL
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KORAL KOÇ
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SERPİL
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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 Applications of atomic force microscopy in textiles(Sage, 2015-01-01) Koç, Serpil Koral; KORAL KOÇ, SERPİL; Mühendislik Fakültesi; Tekstil Mühendisliği Bölümü; 0000-0002-0739-8256; AFZ-8325-2022Potential applications of atomic force microscopy (AFM) in textiles are explained. For this purpose samples were carefully selected from both natural and synthetic fibers. Cotton, wool, conventional polyethylene terepthalate (PET), antibacterial PET, and antistatic PET were investigated by means of 3D topography imaging, phase imaging, and calculation of their Rq values. The distribution of the additives in the cross sections of antibacterial PET and antistatic PET were analyzed. Moreover, differences between inner and outer cross section of trilobal PET was observed by force spectroscopy. The results are discussed considering the fiber properties. It is concluded that AFM is a powerful tool to investigate different properties of textile fibers, and it gives valuable information.Publication A new approach to determination of the instability of air-jet textured yarns(Inda, 2015-01-01) Koç, Serpil Koral; Düzyer, Şebnem; Hockenberger, Aslı; KORAL KOÇ, SERPİL; DÜZYER GEBİZLİ, ŞEBNEM; HOCKENBERGER, ASLI; Mühendislik Fakültesi; Tekstil Mühendisliği Bölümü; 0000-0002-0739-8256; 0000-0003-3737-5896; AFZ-8325-2022; AFO-0698-2022; IMR-3897-2023Determination of the instability of air-jet textured yarns is a very important aspect of their quality characterization. To overcome this problem many researchers have suggested different techniques, however none has been accepted as a standard method. Among all the methods, that suggested by Demir et al. takes attention, since it was improved after investigating the advantages and disadvantages of most of the techniques in use. Recovery from strain measurements are commonly used to get information about fiber molecular structure. In this study, instability of air-jet textured yarns was investigated by using both Demir's instability test method and recovery from strain measurements. It was observed that Demir's method is a practical and reliable way to compare the instability of air-jet textured yarns produced from the same raw material. For comparing different materials it was more beneficial to use recovery from strain measurements.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.