FBE- Nano Bilim ve Nano Mühendislik
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Nano Bilim ve Nano Mühendislik Ana Bilim Dalı altında bir lisansüstü programı olup, yüksek lisans ve doktora düzeyinde eğitim vermektedir.
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Konu "air filters" ile FBE- Nano Bilim ve Nano Mühendislik'a göz atma
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ÖgeDevelopment and characterisation of functional nanofibers for face mask applications(Fen Bilimleri Enstitüsü, 2020) Baysal, Tuğba ; Demir, Ali ; 633557 ; Nano Bilim ve Nano MühendislikNowadays, air pollution is a major problem all around the world and human life is seriously and negatively affected by air pollution. It causes serious health problems including cancer. Air pollutants can be classified into three groups as ultra-fine particulates, toxic gases and biological pollutants involving viruses and bacteria. Very recent COVID-19 pandemic has clearly showed all humanity how a minute virus-based air pollution could be a human disaster. In this study, the filtration application of nanofibrous mats to be functionalized with MgO or ZnO nanoparticles have been investigated. Firstly, effect of MgO NP concentration and thickness of nanofiber layer on particulate filtration have been investigated. 25% MgO/PAN filter produced with 60-min electrospinning time have showed high filtration efficiency of 97,6% and low pressure drop of 215 Pa, which meet the face mask standard of EN149+A1. It has been shown that as the nanoparticle concentration in the polymer solution increases; the surface of the nanofiber filter becomes rough, the nanofiber diameters increase, and the particle filtration performance of the filter increases. The increase in filtration efficiency of the filter is related to the adsorption ability of MgO NPs and the decrease in pressure drop value is related to the increased pore size among nanofibers. Secondly, adsorption studies with toluene gas, one of the toxic volatile organic compounds, have been carried out using MgO/PAN NF with various MgO NP concentrations, various nanofiber layer thicknesses and two different adsorption times. Physical adsorption takes places between toluene gase and MgO NP by the means of hydroxyl and oxide groups on the surface of the nanoparticle. We have achieved a high amount of toluene adsorption of 53.31%. Antibacterial efficacy of ZnO/PAN filter have been evaluated by using two types of bacteria, gram positive S. aureus and gramnegative E. coli. The antibacterial activity of ZnO NPs was found to be higher against E. coli than S. aureus due to differences in the cell membrane of two different bacteria type.