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Synthesis, Characterization and Cr(VI) Adsorption Properties of Modified Magnetite Nanoparticles

100%
Çıftçı H., Ersoy B., Evcın A.
Acta Physica Polonica A
|
2017
|
vol. 132
|
issue 3
564-569
EN
In this study, magnetite (Fe₃O₄) nanoparticles were synthesized by chemical co-precipitation method, coated with silica, and then the surface of silica coated magnetite (Fe₃O₄@SiO₂) nanoparticles was modified with (3-aminopropyl)triethoxysilane (APTES) at first. Secondly, attained nanoparticles were characterized by the Fourier transform infrared, X-ray diffraction, transmission electron microscopy, the Brunauer-Emmett-Teller, vibrating sample magnetometer, and zeta-sizer devices/methods. Finally, detailed adsorption experiments were performed to remove hexavalent chromium (Cr(VI)) from aqueous media by synthesized nanoparticles. Mean size and specific surface area of synthesized nanoparticles were about 15 nm and 89.5 m²/g, respectively. The highest adsorption capacity among used adsorbents (Fe₃O₄, Fe₃O₄@SiO₂, Fe₃O₄@SiO₂@L) was attained by Fe₃O₄ nanoparticles and it was determined that adsorption capacity of the other two adsorbents was too low when compared to the Fe₃O₄ nanoparticles. Optimum conditions for Cr(VI) adsorption by Fe₃O₄ nanoparticles were: pH, 3; temperature, 55°C; contact time, 90 min; adsorbent concentration, 0.5 g/l and initial Cr(VI) concentration 10 mg/l. Under these conditions, adsorption capacity and removal percentage of Cr(VI) were found to be 33.45 mg/g and 88%, respectively.
2
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Investigation of Wear Strength of Blast Furnace Slag Blended Polymer Materials

100%
Gunes I., Uygunoğlu T., Evcın A., Ersoy B.
Acta Physica Polonica A
|
2017
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vol. 132
|
issue 3
599-603
EN
Having symmetrical and balanced material properties, polymer matrix composites are increasingly becoming popular due to easiness of construction and are use in the production of aerospace and automotive structures. In the study, we developed polymer composites based on epoxy resins, containing up to 40 wt.% of blast furnace slag and determined their pin-on-disc dynamic friction, wear, Shore hardness and surface roughness values. Wear tests were performed using a pin-on-disc under dry friction conditions, at the loads of 5, 10, 15 and 30 N, using slip velocity of 0.3 m/s and along distance of 500 m. The hardness and wear resistance values increased with the increase in the content of blast furnace slag. Showing the relationship between wear rate and hardness, an equation with parameters dependent on load was provided. There was an increase in the dynamic friction with an increase in the surface roughness. In addition, dynamic friction was an increasing function of the wear rate. The wear surfaces of the polymer composites were analyzed using scanning electron microscopy. It was observed that the wear rate of the epoxy composites and pure epoxy samples ranged from 19.85 to 171.42 mm³/Nm.
3
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Radiation Shielding Properties of Some Composite Panel

88%
Al-Sarray E., Akkurt İ., Günoğlu K., Evcın A., Bezır N.
Acta Physica Polonica A
|
2017
|
vol. 132
|
issue 3
490-492
EN
With the discovering atomic nucleus, nuclear science started to be used in different fields and researcher focused on radiation protection as it is dangerous for human cell. Thus radiation physics and materials development becomes one of the important subject in science for this purposes. The developed material should be used for radiation shielding. In this work gamma ray shielding properties of some composite materials produced by polymer have been investigated.
4
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Production of Barite and Boroncarbide Doped Radiation Shielding Polymer Composite Panels

76%
Evcın O., Evcın A., Bezır N., Akkurt İ., Günoğlu K., Ersoy B.
Acta Physica Polonica A
|
2017
|
vol. 132
|
issue 3
1145-1148
EN
Developments in nuclear technology in the last century have lead to the use of radiation in different areas of human activity. These are not just the energetics but also food, agriculture, medicine, industry and science. Thus, radiation has become an inevitable phenomenon in our lives. Since we cannot isolate radiation from our life, the radiation protection methods should be available. As alternatives to conventional radiation prevention methods, such as lead and heavy concrete shielding, more functional materials need to become the focus of research. The development of the least harmful to the environment, easily applicable, flexible radiation shields has become very important. In this study, silicon matrix composite panels, doped with different ratios of barite and boron carbide, were produced and characterized by optical and scanning electron microscopy (SEM). Gamma and neutron radiation shielding properties of these materials were investigated. The results have been compared with the lead as the standard shielding material.
5
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Characteristic Properties of Dy-Eu-Ce Co-Doped ZrO₂ Nanofibers Fabricated via Electrospinning

76%
Çıçek Bezır N., Evcın A., Kayali R., Kaşikçi Özen M., Esen K., Cambaz E.
Acta Physica Polonica A
|
2016
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vol. 130
|
issue 1
300-303
EN
Zirconium oxide (ZrO₂) is one of the widely studied oxide materials because of its excellent electrical, mechanical and optical properties. In this study, undoped and Dy-Eu-Ce co-doped ZrO₂ nanofibers were fabricated by electrospinning method and their crystal structure, surface morphology, optical properties, electrical and electronic properties, and chemical properties have been analyzed using X-ray diffraction, scanning electron microscope (SEM), UV/VIS spectrometer, four point probe technique (FPPT) energy dispersive X-ray (EDX) measurements, respectively.
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