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Öğe Novel approach for the production of poly (vinyl alcohol) nanofibers: Centrifugal spinning(Chamber of Textile Engineers, 2018) Akgül, Y.; Kiliç, A.One of the emerging technologies for the nanofiber production is "centrifugal spinning". It is a compatible technique for industrial applications due to higher production rates compared to electrospinning, which is the most widely used method. In this study, poly(vinyl alcohol) nanofibers which are used in high value added products such as biomedical applications and lithium ion battery electrodes were produced via centrifugal spinning. Effect of production parameters (solution concentration, needle diameter, rotor speed and needle-collector distance) on fiber morphology was investigated with SEM images. Optimum conditions were determined as 10-15 wt% solution concentration, 6000-9000 rpm speed, 0.5 mm needle diameter and around 150 mm needle-collector distance. Also, nanofibers with diameters below 200 nm were produced at industrial rates. © 2012 Journal of Textiles and Engineer.Öğe Optimization of Electro-Blown PVDF Nanofibrous Mats for Air Filter Applications(TUBITAK, 2024) Toptas, A.; Çalisir, M.D.; Kiliç, A.Particles with diameters smaller than 2.5 µm (PM2.5) have the capability to penetrate into respiratory system, thereby exerting adverse effects on human health. High-efficiency nanofiber mats present a viable and efficient solution for the purification of ambient air contaminated with such particulate matter. In this study, PVDF based electret nanofiber mats were optimized via electro-blowing technique. The experimental parameters were systematically devised utilizing a Taguchi three-level L9 orthogonal design, and the results were subsequently analyzed using ANOVA. In this context, among the examined parameters (solution concentration, air pressure, and electrical field), the most significant factors influencing fiber diameters were identified as solution concentration and electric field strength. While an increase in air pressure exhibited a negligible influence on fiber diameters, it was observed to mitigate undesired droplet density. The optimal parameters yielding the thinnest fiber (124 ± 71 nm) were determined as 9 wt.% solution concentration, 2 bar air pressure, and 30 kV electrical voltage. Furthermore, the application of corona discharge treatment to the specimens resulted in a remarkable enhancement of quality factors by over 70%. © 2024, TUBITAK. All rights reserved.Öğe Production of nanofibrous wound dressings via solution blowing(Chamber of Textile Engineers, 2018) Canbay, Gökçe, E.; Akgül, Y.; Kiliç, A.; Açma, E.In this study, thermoplastic polyurethane (TPU) nanofibers were produced via a novel technique: solution blowing. Smoke tree oil was obtained with soxhlet extraction and according to GC-MS analysis; it was shown that obtained extract includes constituents with high antimicrobial activity. Therefore, TPU nanofibers coated with smoke tree oil at different amounts using drop casting in order to obtain antibacterial nanofibers. All coated nanofibers showed antibacterial activity against to S.Aureus and E.Coli. On the other hand, SEM images show that increase of amount of smoke tree oil effect to fiber morphology negatively. Thus, air permeability of nanofibers mats decreased significantly. © 2012.
