http://journals.psmpublishers.org/index.php/ijnas/issue/feed International Journal of Nanotechnology and Allied Sciences 2018-03-09T17:20:03+00:00 International Journal of Nanotechnology and Allied Sciences ijnas@psmpublishers.org Open Journal Systems <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> http://journals.psmpublishers.org/index.php/ijnas/article/view/135 Synthesis and Characterization of Bentonite Nanocomposites from Egyptian Bentonitic Clay 2018-01-01T22:06:15+00:00 Sameh Hamed Ismaeel drsameheltayer@yahoo.com Mohamed Sayed Mabrouk drsameheltayer@yahoo.com Ali Abd-Almotalib Ali drsameheltayer@yahoo.com Khaled Abn Elwalead drsameheltayer@yahoo.com <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> 2017-10-23T00:00:00+00:00 ##submission.copyrightStatement## http://journals.psmpublishers.org/index.php/ijnas/article/view/136 Elucidative Physiological Optimization of Silver Nanospheres Biogenesis by Molds 2018-03-09T16:31:23+00:00 Amal AI Mekawey amalmekawey@yahoo.com Eman A Helmy dr-emanhelmy@azhar.edu.eg <p>One of the substantial and most ordinary requests asked for that when starting to oversee nanoparticles is “The reason are nanoparticles so intriguing? Why work with these to an incredible degree little structures that are attempting to manage and join especially when differentiated and their obviously noticeable accomplices? The suitable reaction lies in the novel properties controlled by these nanoparticles.<em>&nbsp;In vitro</em>&nbsp;myco synthesis of silver nanoparticles (AgNPs) using&nbsp;<em>Penicillium aurantiogresium, Penicillium roqueforti, Aspergillus niger, Verticillium chlamydosporium var. chlamydosporium, Trichoderma viride&nbsp;</em>and<em>Trichoderma longibranchiatum&nbsp;</em>had been investigated. The procedure of silver particle lessening by either extracellular contagious filtrate or intracellular without cell filtrate was accomplished which prompt the improvement of an easy procedure for the amalgamation 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 created were described by different expository procedures, for example, TEM, FT-IR, and X-Ray investigation of both EDX and XRD. The acquired outcomes uncovered that the extent of nanoparticles for all the tried organisms extended from 8.97 to 16.73 nm with variable shapes, a generous portion of them exhibit in a circular nature.</p> 2017-11-23T00:00:00+00:00 ##submission.copyrightStatement## http://journals.psmpublishers.org/index.php/ijnas/article/view/134 A Review on Nanofluid Impingement Jet Heat Transfer 2017-12-09T08:05:44+00:00 Amr Mostafa Darwish im_perfect_one@yahoo.com Abdel-Fattah Mohamed Ramsdan El-Kersh amelkersh@hotmail.com Mohamed Naguib El-Sheikh elsheikh53@yahoo.com Ibraheem Mahmoud El-Moghazy elmoghazyi@yahoo.com <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> 2017-10-23T00:00:00+00:00 ##submission.copyrightStatement## http://journals.psmpublishers.org/index.php/ijnas/article/view/140 Silver Nanoparticles: Synthesis, Medical Application, and Toxicity Effects 2018-03-09T17:06:26+00:00 Hend M. M. Selim hmm04@fayoum.edu.eg Doaa S. S. Mohamed hmm04@fayoum.edu.eg Hager M. G. Eskander hmm04@fayoum.edu.eg <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> 2017-12-13T00:00:00+00:00 ##submission.copyrightStatement## http://journals.psmpublishers.org/index.php/ijnas/article/view/141 Methods of Synthesizing of Superparamagnetic Iron Oxide Nanoparticles and their Surface Modifications for Drug Delivery: A Review 2018-03-09T17:20:03+00:00 Wesam Ahmed Tawfik naqaafoundation@gmail.com <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> 2017-12-13T00:00:00+00:00 ##submission.copyrightStatement##