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Article
Synthesis and Antibacterial Activity of ZnO Nanoparticles Using the Precipitate and Irradiation Methods

Author: Athraa S. Ahmed , Shaimaa H. Jaber , Barakat A. F. Kamel , Kafi M. Dawood
Journal: Iraqi Journal of Biotechnology المجلة العراقية للتقانات الحياتية ISSN: 18154794 Year: 2019 Volume: 18 Issue: 2 Pages: 88-94
Publisher: Baghdad University جامعة بغداد

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Abstract

In this study, ZnO NPS were synthesized in two methods: the precipitate and irradiation methods. X-Ray powder Diffraction, Transmission and Scanning Electron Microscopy were used to study the crystal structure and surface morphology of the synthesized NPS, which showed that the average particle size of ZnO NPS synthesized by irradiation method was better than which synthesized by precipitate method. The antibacterial activity against staphylococcus epidermidis and E.coli bacteria were studied and showed that ZnO NPs prepared by Irradiation method have higher antibacterial activity against S.epidermidis and E.coli than ZnO NPs prepared by precipitate method because of ZnO NPs prepared by Irradiation method smaller than ZnO NPs prepared by precipitate method. In current study, we concluded that irradiation method is better than precipitate method in the preparation of ZnO NPS and in the inhibition of the work of types of bacteria such as (staphylococcus epidermidis and E.coli).


Article
Synthesis and Characterization of Nano-Aluminum Oxide Via Biological and Electrochemical Methods

Authors: Barakat A. F. Kamel --- Shaimaa H. Jaber --- Amel S. Mahdi --- Mohammed A. K. Alsouz --- et al.
Journal: Al-Mustansiriyah Journal of Science مجلة علوم المستنصرية ISSN: 1814635X Year: 2018 Volume: 29 Issue: 4 Pages: 67-72
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

In this research work, the nanoparticles of aluminum oxide were synthesized by two ways. The first way is the biological by using (Pseudomonas aeruginosa) bacteria with a rate diameter (102.35) nm. The second way is the electrochemical with a rate diameter (62) nm. These nanoparticles were characterized by Atomic Force Microscopy (AFM), X-Ray diffraction technique (XRD), Transmission Electron Microscopy (TEM) and Scanning Electron Microscopy (SEM). Alumina nanoparticles are thermodynamically stable particles over a wide temperature range. The biological activity of these nanoparticles toward different species of pathogenic bacteria (Staphylococcus aureus) and (Pseudo monas) has been investigated. The nanoparticles prepared by chemical way was more effective in the inhibition of bacteria compared with that nanoparticles prepared by biological way.

تم في هذا البحث تحضير الدقائق النانوية لاوكسيد الالمنيوم بطريقتين: الطريقة الاولى هي الطريقة البايولوجية بأستخدام بكتريا (Pseudomonas aeruginosa) وبمعدل (102.35) نانومتر. اما الطريقة الثانية فهي الطريقة الكهروكيميائية وبمعدل (62) نانومتر. تم تشخيص هذه الجسيمات باستخدام اجهزة ( مجهر القوة الذرية، تقنية الاشعة السينية، مجهر الانتقال الالكتروني ومجهر الماسح الالكتروني) ووجد ان هذه الجسيمات مستقرة ثرموديناميكيا على نطاق حراري واسع. كما ودرست الفعالية البايولوجية للجسيمات النانوية تجاه انواع مختلفة من البكتريا المسببة للامراض مثل (Staphylococcus aureus) و (Pseudo monas) ووجد ان الدقائق النانوية المحضرة بالطريقة الكهروكيميائية اكثر فعالية في تثبيط هذه الانواع من البكتريا مقارنة بالدقائق النانوية المحضرة بالطريقة البايولوجي

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