International Journal of Nanotechnology and Allied Sciences <p>International Journal of Nanotechnology and Allied Sciences (IJNAS; ISSN: 2523-9252) is a peer-reviewed, open access,&nbsp; international journal that considers articles on all aspects of nanotechnology and allied sciences.</p> en-US (International Journal of Nanotechnology and Allied Sciences) (MANI MUGHAL) Thu, 30 Nov 2017 00:00:00 +0000 OJS 60 Screening and Optimization of Silver Nanoparticles Biosynthesis by Fungi <p><em>In vitro</em> mycosynthesis of silver nanoparticles (AgNPs) using <em>Penicillium aurantiogresium, Penicillium roqueforti, Aspergillus niger, Verticillium chlamydosporium var. chlamydosporium, Trichoderma viride </em>and<em> Trichoderma longibranchiatum </em>had been investigated. The process of silver ion reduction by either extracellular fungal filtrate or intracellular cell-free filtrate was achieved which lead to the development of an easy process for synthesis of silver nanoparticles. Upon exposure of the fungal filtrate to silver nitrate, the latter was reduced to silver nanoparticles as indicated by a color change observed and characterized by UV-visible spectroscopy. The optimum experimental conditions for AgNPs synthesis were found to be a temperature of 37<sup>o</sup>C at pH of 6.0 and a substrate concentration of 2mM silver nitrate after 24 hours incubation times in dark and measured spectrophotometrically at 430 nm.&nbsp; Silver nanoparticles produced were characterized by various analytical techniques such as TEM, FT-IR and X-Ray analysis of both EDX and XRD. The obtained results revealed that the size of nanoparticles for all the tested fungi ranged from 8.97 to 16.73 nm with variable shapes, most of them present in spherical in nature.</p> A.I. Amal, Mr Mekawey, E. A. Helmy ##submission.copyrightStatement## Thu, 23 Nov 2017 00:00:00 +0000 Synthesis and Characterization of Bentonite Nanocomposites from Egyptian Bentonitic Clay <p>The aim of this paper was synthesis of bentonite nano-composites from bentonitic clay. Calcium bentonitic clay obtained from El Barqan area northern Egypt was activated by Na<sub>2</sub>CO<sub>3 </sub>and purified. Both raw and purified bentonitic clay were characterized by XRD, XRF, SEM, TGA\ DTA and TM in addition to the study of the mineralogical composition of non-clay mineral under polarizing microscope. Physico-chemical and geotechnical properties such as Cation Exchange Capacity (CEC), Specific Surface Area (SSA), free swelling, Atterberge limits, GSD, OMC and MC were determined. Purification of raw Egyptian bentonitic clay was used for preparation of bentonitic clay nanocomposites as its high content of montmorillonite. Purification was done by four steps; eliminate the impurity levels of non-clay minerals, eliminate the impurity levels of Fe, eliminate the impurity levels of AL and concentrate&nbsp;&nbsp; montmorillonite in the sample using centrifuge. The grain size analysis, SEM and XRD of purified bentonitic clay showed the average grain size 200- 300 nm with one dimension less than 100 nm and the content of montmorillonite&nbsp; become 95%.</p> Sameh Hamed Ismaeel, Mohamed Sayed Mabrouk, Ali Abd-Almotalib Ali, Khaled Abn Elwalead ##submission.copyrightStatement## Mon, 23 Oct 2017 00:00:00 +0000 A Review on Nanofluid Impingement Jet Heat Transfer <p>This paper presents overview of experimental investigations and numerical developments using single or multiple nanofluid jet impingement on a hot surface as a heat transfer enhancement technique which employed in many industrial applications. Jet impingement systems can be classified as: confined, semi-confined and unconfined jet. Nanofluid can enhance heat transfer process due to its thermal transport properties of the base fluid, increase the surface area and heat capacity of the fluid and the thermal conductivity. The results of heat transfer enhancement, fluid flow characteristics and effects of nanofluid jet impingement geometrical parameters were presented and analyzed from the previous studies. Nanofluid preparations, its physical and thermal properties with correlations are also presented.</p> Amr Mostafa Darwish, Abdel-Fattah Mohamed Ramsdan El-Kersh, Mohamed Naguib El-Sheikh, Ibraheem Mahmoud El-Moghazy ##submission.copyrightStatement## Mon, 23 Oct 2017 00:00:00 +0000 Silver Nanoparticles: Synthesis, Medical Application, and Toxicity Effects <p>Silver nanoparticles (AgNps) are particles of silver that range in size from 1- 100 nm. Silver nanoparticles are of unique properties and attract a lot of attention due to their wide range of potential application in medicine, electronics, cosmetics and many other fields. Although, chemical and physical methods are the major methods for AgNp synthesis, they are expensive and can absorb toxic materials into them. In this review we focus on biological synthesis of AgNps by fungi, bacteria, and plant extracts as a saver, more feasible alternative. Some recent medical applications such as Anti-inflammatory effects, cancer treatment, and mechanism of antimicrobial effect are described. We also discussed the toxicity of AgNps, its effect on environment and human health.</p> Hend M. M. Selim, Doaa S. S. Mohamed, Hager M. G. Eskander ##submission.copyrightStatement## Wed, 13 Dec 2017 00:00:00 +0000 Methods of Synthesizing of Superparamagnetic Iron Oxide Nanoparticles and their Surface Modifications for Drug Delivery: A Review <p>The aim of this review article is to report the different known methods for the preparation of nanoparticles of iron oxide Magnetite (Fe<sub>3</sub>O<sub>4</sub>) and their applications in drug delivery besides indicating the nanoparticles surface availability for any required chemical modifications which allows the particle for a very wide range of medical applications from diagnosis to therapy. The recent development of biocompatible, functionalized ferrofluids and ferromagnetic particles has directed to a range of novel biomedical and diagnostic applications. The synthesis of nanoparticles of magnetic metal oxides has been reported in recent times by using different chemical methods viz. sonochemical, solvothermal, micro emulsion etc… Magnetite (Fe<sub>3</sub>O<sub>4</sub>) presents many potential possibilities in biomedicine. Since they range from a few nanometers up to 200 nanometers, they rival the size of most cells, viruses, proteins, and genes. This means that they can interact with these biological units “up close”. Superparamagnetic nanoparticles has a very active surface where several modifications can be applied giving them a great chance for accepting different drugs on their surfaces with different compositions. Applications of Magnetite (Fe<sub>3</sub>O<sub>4</sub>) include uses as drug delivery devices, in bioseperations and hyperthermia treatment. In the clinical area, these particles are being used in a variety of ways, notably as contrast agents for magnetic resonance imaging (MRI). Ferrofluids respond to an external magnetic field enabling the solution's location to be controlled through the application of a magnetic field. This enables the use of magnetic forces for the control of properties and flow of the liquids, giving rise to numerous technical applications, especially for in vivo applications, such as drug delivery.</p> Wesam Ahmed Tawfik ##submission.copyrightStatement## Wed, 13 Dec 2017 00:00:00 +0000