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عنوان مقاله به فارسی: تولیدنانوالیاف GdBa2Cu3O7-X به روش الکتروریسندگی
نویسندگان عضو دانشگاه
نویسندهنقشعضویت
سیداکبر ایزدپناهنویسنده اولدانشجو
عبدالمحمد قلمبردزفولی نویسنده دومهیأت علمی
مرتضی زرگرشوشترینویسنده سومهیأت علمی
نویسندگان خارج از دانشگاه
عنوان مقاله به انگلیسی : Production of GdBa2Cu3O7-x Nanofibers by electrospinning method
ارائه شده در کنفرانس : Electrospinning, Principles, Possibilities and Practice 2013 (IOP2013)
زبان ارائه : فارسی
نحوه ارائه : ارائه پوستر وچاپ خلاصه
وضعیت نسخه موجود : کاغذی
شماره صفحه چاپ مقاله در مجموعه مقالات : از : 0 تا 0
واژگان کلیدی : GdBa2Cu3O7-x, Nanofiber, electrospinning, SEM, XRD
چکیده فارسی :
چکیده انگلیسی :

In this thesis GdBa2Cu3O7-x(a high temperature ceramic superconductor) nanofibers from a precursor polymer solution are produced, using electrospinning method. Precursor polymer water solution containspolyvinylpyrrolidone(PVP) and a mixture of Gadolinium nitrite, Barium nitrite, and cupper nitrite with mass ratio of 5/1 (polymer/nitrite).Using above method (electrospinning) and with following condition; solution density of 55%, voltage of 18 kV,distance between collector plate and nuzzle of 12 cm and injection solution rate of 1 ml/h, fibers with diameters of the order of 470 nm and average length of greater than 10 μm are produced. The SEM pictures of GdBa2Cu3O7-x fibers indicate that with increasing the potentials, the distance between collectorplate and nuzzle, and solution density the diameter of fibers will reduce, however with increasing the injection solution rate the diameter of fibers will increase. For nitrogen liberation, the produced fibers are heated to a temperature of 200 ◦c and kept at this temperature for 12 hours. The SEM pictures at this stage indicate that the fiber diameters are increase to about 1μm. This diameter increased of the fibers could be predicted with understanding of the reaction between citric acid and nitrites. After this step the calcination processes are done on the fibers at a temperature of 900 centigrade degree. Following the calcination, in order to achieve a superconducting phase transition, the fibers were subjected to a cooking process in a temperature of 930 centigrade degree for 12 hours. X-Ray diffraction patterns of the cooked sintered samples indicate that the GdBa2Cu3O7-x superconductingphases are created. The SEM pictures, at this stage, indicate that after sintering process the acquired fiber diameters are largely decreased. Finally with the use of measurement software, the average diameter of produced nanofibers is estimated to be of the order of 90 nm.

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