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Preparation and Study of the Dielectric Properties of (CoFe2O4-PVA) Composite Film
تحضير و دراسة الخواص العزلية لغشاء متراكب (CoFe2O4-PVA)

Authors: Tahseen H.Mubarak تحسين حسين مبارك --- Sabah M.Ail صباح محمد علي --- Omar W.Ahmed عمر عبد الوهاب احمد
Journal: Diyala Journal For Pure Science مجلة ديالى للعلوم الصرفة ISSN: 83732222 25189255 Year: 2017 Volume: 13 Issue: 4 - part 2 Pages: 73-82
Publisher: Diyala University جامعة ديالى

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Abstract

The composite films prepared from weight fraction (0, 1, 3, 5 wt%) of cobalt ferrite powder and polymer polyvinyl alcohol (PVA) by the casting method. The cobalt ferrite powder were synthesized by sol-gel auto combustion as a chemical methods, sintered at (600oC) for 4 hours. The X-ray diffraction (XRD) pattern of powder showed single phase spinel structure. Optical microscope examination for composite films showed the homogeneity and have been studied dielectric properties (Dielectric constant (〖 ε〗_r^Ꞌ), Loss facter (ε_(r )^ꞋꞋ)) in rang (50Hz-3MHz).The value of (〖 ε〗_r^Ꞌ) and (ε_(r )^ꞋꞋ) decrease with increasing frequency in the rang (50Hz-3MHz).

حضرت الاغشية المتراكبة من مسحوق فرايت الكوبالت وبولي فينيل الكحول (CoFe2O4-PVA)باستعمال طريقة الصب و النسب الوزنية من محتوى مسحوق الفرايت(x=0,0.01,0.03,0.05) المضافة الى البوليمر ، بينما حضر مسحوق فرايت الكوبالت بطريقة سول –جل الاحتراق التلقائي ،و اجري فحص حيود الاشعة السينية (XDR) للمسحوق الذي بين تشكل الطور الفرايت المغزلي . عينات الاغشية المتراكبة اجري لها فحص المجهر الضوئي للتأكد من خلو الاغشية من التشققات ومعرفة تجانسها ، تم دراسة الخواص الكهربائية باستعمال جهاز(LCR-meter) ووجد ان ثابت العزل ومعامل الفقد العزلي يتناقص مع زيادة تردد المجال الكهربائي المسلط.


Article
Biosynthesis , Characterization and Removal Efficiency for Petroleum Leakage of the Cofe2o4 Nanoparticles

Authors: Haydar Matz Muhy --- Fatih Duman
Journal: Al-Mustansiriyah Journal of Science مجلة علوم المستنصرية ISSN: 1814635X Year: 2018 Volume: 29 Issue: 3 ICSSSA 2018 Conference Issue Pages: 21-28
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

Magnetic nanoparticles are widely used in areas such as biosensors, data storage devices, waste water treatment and biomedicine due to their biocompatibility and low toxicity. In this study, biosynthesis of the CoFe2O4 nanoparticle (NP) was carried out using the bark extract of Aesculus hippocastanum plant as a reducing and capping agent. Synthesized NPs were char-acterized by ultraviolet-visible spectrophotometer (Uv-Vis.), Dynamic Light Scattering (DLS), zeta load, X-Ray Dust Diffraction (XRD), Fourier Transformed Infrared Spectroscopy (FT-IR), Scanning Electron Microscopy, Raman, BET, and Thermogravimetric Thermal Analysis (TGA). The Lethal dose value (LD50) and the crude oil removal efficiency were examined. The characteristic light absorption of the CoFe2O4NP has been measured at 330 nm, surface charge of +14.4 mV, mean size of 75 nm and effective diameter of 432 nm. The XRD analy-sis revealed that the particle structure was in the cubic spinel structure with functional groups bound by FT-IR analysis and Raman data. It has been noted that the CoFe2O4NP, which was synthesized by biological method, can remove a 78.5% of the crude oil from the contaminat-ed water. It has been determined that the NP’s have a low toxic effect on D. magna (LD50= 728.267 ppm). In this study, it has been suggested that the CoFe2O4 NP with A. hippocasta-num bark extract could be synthesized by a cheap, relatively easy and environmentally friendly method which used for purification of contaminated water bodies.

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