جوادپور, جعفر
دانشگاه علم و صنعت ایران
[ 1 ] - تأثیر پلی‌وینیل پیرولیدون (PVP) بر اندازه ذرات و خواص نوری نانوذرات اکسید روی سنتز شده با روش ترمولیز
نانوذرات اکسید روی )ZnO( با استفاده از روش ساده و تک مرحله ای ترمولیز، با حل کردن استات روی به عنوان منبع تامینکننده روی و پلی ونیل پیرولیدون به عنوان عامل فعالساز سطحی در اتیلن گلیکول در دمای °C60 تهیه شده است. در این تحقیق تاثیر مقادیر مختلف عامل فعالساز سطحی PVP بر روی ساختار و فاز نهایی نانوذرات حاصل بررسی شد. دمای تجزیه کمپلکس در این سنتزها °C150 انتخاب شد. نتایج حاصل نشان میدهد...
[ 2 ] - تاثیر روش حذف سورفکتانت دربهبود ویژگی های ساختاری مزوحفرات هیدروکسی آپاتیت نانوسایز
در تحقیق حاضر نانوذرات هیدروکسی آپاتیت مزومتخلخل با کاریرد رهایش دارو با استفاده از سورفکتانت بلاک کو پلیمر با موفقیت سنتز گردید. برای کنترل اندازه حفرات در این نانوذرات از تغییر در روش حذف سورفکتانت استفاده گردید. برای یک گروه از نمونه ها از روش تکلیس و دمای 550 درجه سانتی گراد استفاده گردید که منجر به اندازه حفرات 56 نانومتر و سطح ویژه 48 متر مربع بر گرم شد. در گروه دیگر از نمونه ها با استفاد...
[ 3 ] - تأثیر نوع حلال بر سنتز آلومینای مزوپور با استفاده از کوپلیمر سه-بلوکی پلارونیک P123
در تحقیق حاضر، آلومینای مزوپور، به روش خودچینشی القاء شده توسط تبخیر (EISA) با استفاده از حلال مناسب سنتز شد. نمونه‌های مزومتخلخل آلومینایی با استفاده از آلومینیوم ایزوپروپکساید و آلومینیوم نیترات به عنوان پیش‌ماده(جفت اسید وباز) در حضور کوپلیمر سه-بلوکه P123 به عنوان قالبگیر و حلال های اتانول و تتراهیدروفوران تهیه شدند. مشخصات فیزیکی نمونه‌ها با استفاده از جذب و واجذب نیتروژن (BET)، میکروسکوپ...
[ 4 ] - THE EFFECT OFCARBON NANOTUBES ON THE SINTERING BEHAVIOR OF ZIRCONIA BASED MATERIALS
Different volume fractions (1.3, 2.6, and 7.6 Vol.%) of carbon nanotubes (CNTs) were dispersed within 8Y-TZP nanopowders. Mixed powder specimens were subsequently processed by spark plasma sintering (SPS) and effects of CNTs on the sintering process of 8Y-TZP/CNT composites was studied. Maintenance of CNTs through the SPS process was confirmed using TEM and Raman Spectroscopy. Studies on the si...
[ 5 ] - Mechanochemical synthesis of alumina nanoparticles
Abstract: Nano- size alumina particles have been synthesized by mechanical activation of a dry powder mixture of AlCl3 and CaO. Mechanical milling of the above raw materials with the conditions adopted in this study resulted in the formation of a mixture consisting of crystalline CaO and amorphous aluminum chlorides phases. There was no sign of chemical reaction occurring during milling stag...
[ 6 ] - Effect of Micellization pH on Properties of Sphere-like Mesoporous Hydroxyappatite
Mesoporous hydroxyapatites were syntesized by self-assembly method using Cetyltrimethylammonium bromide (CTAB) as cationic surfactant and 1-dodecanethiol as pore expander with pore expander/surfactant mass ratio of 4.22 and synthesis temperature of 80 °C in different micellization pH. The field emission-scanning electron microscopy (FESEM), x-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) ...
[ 7 ] - Effect of Sintering Conditions on Microstructure and the Superconducting Properties of YBa2Cu3O7 x
YBa2Cu3O7-X tapes fabricated from precursor powder, were used to investigate the effect of sintering conditions on the microstructure. The sintering experiments were carried out in oxygen over the temperature range of 915-950ْC. Scanning electron microscopy was used to examine the sintered products. The result indicated a significant increase in densification and grain growth when the tapes were...
[ 8 ] - Effect of Particle Size Distribution and Chemical Composition on Properties of Magnesia Chromite Bricks
The present study was undertaken to improve the quality and increase the life time of magnesia-chromite refractory bricks used in the copper and lead industries. The results show that a decrease in the amount of large chromite particles in the formulation improves the thermomechanical properties and also reduces the slag penetration in the bricks. In addition it was also observed that the use o...
[ 9 ] - Fabrication and Characterization of Polycaprolactone – Zeolite Y Nanocomposite for Bone Tissue Engineering
In recent years, nanoceramics have been used in scaffolds to emulate the nanocomposite with a three-dimensional structure of natural bone tissue. In this regard, polycaprolactone biopolymer is widely used as a scaffold in bone tissue engineering. The goal of this research is to produce porous scaffolds of polycaprolactone - zeolite biocomposite with suitable mechanical, bioactive and biological...
[ 10 ] - The effect of Ag and Co dopants on structural and antibacterial properties in hydroxyapatite
This research was conducted to develop antibacterial properties in HA composite by doping Ag-Co simultaneously. Chemical compounds Ca10-x Ag x/Co y(PO4)6 (OH)2 with values (x, y= 0, 0.5, 1) were synthesized by co-precipitation method which is an economical and simple way. XRD, FESEM and EDS analysis were used to investigate structural and microstructural characteristics. The result of XRD ana...
[ 11 ] - Effect of citric acid chelating agent on morphology of ZnO particles prepared by hydrothermal method
Abstract Zinc oxide is one of the most widely used and important materials in today's science and industry. In this study, ZnO nanoparticles were synthesized by hydrothermal method. Zinc acetate, citric acid and deionized water was respectively used as a source of zinc ion, solvent and chelating agent. In this study, the effect of citric acid concentration as an additive was studied on morphol...
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