Materials and Biomaterials Science <table id="pt1:pt_r1:0:imc1:pgl21" class="af_panelGroupLayout" border="0" summary="" cellspacing="0" cellpadding="0"> <tbody> <tr> <td valign="top"> <div id="pt1:pt_r1:0:imc1:dc_pgl3" class="af_panelGroupLayout"> <div> <div id="pt1:pt_r1:0:imc1:dc_i1:0:pgl26" class="af_panelGroupLayout"> <div><strong><span style="color: red;"><span class="icon-row-cont-txtsmall">The COVID-19 pandemic impacts us all, and we are offering all possible support to our customers and employees. While at present there has been no major impact to our business or services, we ask for your understanding that this unprecedented situation might lead to some delays in the peer review process.</span></span></strong></div> </div> </div> </div> </td> </tr> </tbody> </table> <p>&nbsp;</p> <p><strong>Journal Overview</strong></p> <p>Materials and Biomaterials Science provides a unique forum for the discussion of novel processing, applications and theoretical studies of functional materials and biomaterials for (opto)electronics, sensors, detectors, biotechnology and green energy.&nbsp;This journal encompasses insights into the chemistry, biology and materials science underpinning (bio) materials research, new concepts in biomaterials design, and using materials to answer fundamental questions.</p> <p><span lang="EN-GB"><strong>ISSN:&nbsp;</strong>2661-7226</span></p> <p><span lang="EN-GB"><strong>Abbreviation:</strong>&nbsp;Mater. Biomater. Sci.</span></p> en-US <p>Copyright © 2019 Journal of Materials and Biomaterials Science&nbsp;</p> (A. Henni) (For more informations) Mon, 01 Jun 2020 00:00:00 +0200 OJS 60 Influence of Particle Size and Bound polymer on the Mechanical and Rheological Properties of Polypropylene/Inorganic Powder Composites <p>Composites based on polypropylene and calcium carbonate powder were prepared in melt by varying the filler percentage (0-50 wt%) and size (0-180μm). The effects of filler content and size on mechanical and rheological properties of PP/CaCO<sub>3</sub> composites as well as the matrix/filler interface were evaluated. The results showed that Shore D hardness of PP/CaCO<sub>3</sub> composites is slightly affected by the variation of particles size of the filler. However, the Izod impact strength of the composites decreased remarkably with the increase in the filler content and particle size. The characterization of polymer/filler interphase revealed the presence of a bound polymer layer on calcium carbonate surface which persisted even after a prolonged extraction in xylene. In addition, the amount of polypropylene chains adsorbed on filler surface is greater for small size particles than for large particles.</p> <p><strong>Keywords:&nbsp;</strong>Reinforcement; Interphase; Bound polymer; Polypropylene; Calcium carbonate.</p> <p><strong>Downloads :</strong></p> Souad Djellali, Leila Djahnit, Hana Ferkous ##submission.copyrightStatement## Thu, 27 Feb 2020 11:19:57 +0100 A Static drying of yellow onions (Allium cepa): Process monitoring and enumeration of yeasts and moulds in the food <p>In this work, slices of yellow onions (Allium cape) with a diameter of (6.7 ± 0.05) cm and a thickness of (1 ± 0.05) cm are dehydrated in a drying oven at two temperatures: 40 °C and 90 °C. The average initial mass and water content of the samples are 32.61 g and 92.13%, respectively. The microbial flora in moulds and yeast is also enumerated before and after drying.&nbsp;An experiment plan of two variables, namely drying time and temperature, is followed to optimize the process tests. The moisture content is taken a response. The interactions between operating variables are shown and a mathematical model is established expressing, thus, the variation of the moisture content of the onion slices as a function of the temperature and the drying time. A correlation of experimental results and calculations is indeed established.&nbsp;The results show that drying duration decreases with increasing temperature and water content of onion slices decreases from 92.13% to 4.5% during 2595 minutes, and from 92.13% to 9.47% during 1245 minutes, at 40 °C and 90 °C, respectively. Also, the experimental results lead to the appropriate choice of the temperature and the drying time in order to reach adequate moisture content. Finally, Oven drying of the yellow onions with determined dimensions eliminates the moulds to desired and encouraging values.</p> <p><strong>Keywords:&nbsp;</strong>Oven;&nbsp;Yellow&nbsp;Onion;&nbsp;Experimentation;&nbsp;Microbial Flora;&nbsp;Allium cepa.</p> <p><strong>Downloads :</strong></p> Rahmani Youcef, Réda Khama ##submission.copyrightStatement## Thu, 06 Feb 2020 11:13:29 +0100 Production of solar hydrogen at desert site of algeria <p>Hydrogen is a sustainable fuel option and one of the potential solutions for the current energy and environmental problems. Renewable energy–hydrogen systems for remote applications constitute an early niche for sustainable hydrogen energy. Optimal matching between the photovoltaic (PV) system and the electrolyzer is essential for maximum electrical energy transfer and hydrogen production.&nbsp;This paper concerns the study of an autonomous hydrogen production system basically consisting in a solar panel array supplying an alkaline electrolyzer. The system used photovoltaic (PV) modules, an alkaline electrolyzer, and an optimized direct connection between the PV and electrolyzer systems.The data supplied by the experimental system clearly showed the importance of considering the efficiency of photovoltaic module to hydrogen generator efficiency when designing an optimum solar hydrogen system.</p> <p><strong>Keywords: </strong>Solar; Hydrogen; Electrolyzer; Photovoltaic; Alkaline; Algeria.</p> <p><strong>Downloads :</strong></p> Noura Chaouch, Khadidja Bouziane ##submission.copyrightStatement## Thu, 09 Jan 2020 17:05:09 +0100 Performance of magnesium-based sacrificial anode for cathodic protection of steel in simulated saline solution <p>Magnesium is widely used as a sacrificial anode for protecting steel from corrosion. In this paper, the electrochemical behaviour of magnesium sacrificial anodes has been studied using electrochemical impedance spectroscopy (EIS) and polarisation curves, completed by Evans’ diagrams (under galvanic conditions) and SEM observations. The impedance diagrams are composed of two capacitive loops at the high and middle frequencies; the first one is related to the charge transfer resistance in parallel to the double layer capacity, the other one is attributed to the magnesium ion concentration. An inductive loop at low frequencies appeared as due to the formation, adsorption and desorption of the corrosion products, on the surface of the anodes. The intensiostatic curves permit the evaluation of the anodes efficiency as a function of the current flow. The obtained Evans’ diagrams are discussed taking into account the polarization effects at the electrodes for different experimental conditions.</p> <p><strong>Keywords:&nbsp;</strong>Corrosion protection; Sacrificial anodes; Magnesium; Polarization; Impedance;&nbsp;Raman.</p> <p><strong>Downloads :</strong></p> Hana Ferkous, Imene Chikouche, Souad Djellali, Soufiane Boudjelida, Amina Belakhdar ##submission.copyrightStatement## Sun, 05 Jan 2020 11:37:45 +0100 A Synthesis and Characterization of Biodegradable Poly(ethylene succinate). <p>The Biodegradable poly(ethylene succinate)(PESu) was synthesized by melt polycondensation of ethylene glycol and succinic acid. The synthesized polymer was analyzed by <sup>1</sup>H nuclear magnetic resonance (NMR) and Fourier transform-infrared (FT-IR) spectroscopy, diffraction x-rays (DRX) and were confirmed the chemical structure with weight-average molecular weight higher than 60,000 g mol<sup>−1</sup>. We also investigated the Biodegradation of PES by incubating the polymer with micro-organisms such as fungi (<em>Aspergilus Niger</em>) and bacteria (<em>basilus subtili</em>). The decomposition of polymer was confirmed by observed weight loss of the polymer and microbial growth around it and the changing of&nbsp;&nbsp; structure of the polymers were confirmed by IR spectral analyses after biodegradation test.</p> <p><strong>Keywords:&nbsp;</strong>Poly(ethylene succinate); Biodegradable; Characterization; Polymer; Micro-organism.</p> <p><strong>Downloads :</strong></p> Yasmina Khane, Mohamed Beldjillali, Khaldia Sediri, Fatma Dar Kebira, Lahcen Belarbi, Benali Mouffok ##submission.copyrightStatement## Sat, 07 Dec 2019 00:00:00 +0100 Simulation study of an all p-i-n amorphous silicon oxide solar cell <p>For thin film solar cells, it has been reported that using hydrogenated amorphous silicon oxide in absorber layer (with low oxygen concentration) could generate more electricity than hydrogenated amorphous silicon layers in short wavelengths due to wide band gap (E<sub>g</sub>). This work is concerned about the analysis of all p-i-n amorphous silicon oxide based solar cell by numerical simulation. The calculation was carried out by using Analysis of Microelectronic and Photonic Structures (AMPS-1D) simulator. We optimized hydrogenated amorphous silicon oxide (a-SiO<sub>x</sub>: H) as an active layer in the hydrogenated amorphous silicon oxide (a-SiO<sub>x</sub>: H) p-i-n single junction solar cell. We have achieved a power conversion efficiency of 5.716 %. Also, a good agreement between our simulated results and experimental results was obtained.</p> <p><strong>Keywords:</strong> Thin film; Solar cell; Amorphous silicon oxide; AMPS-1D; simulation.</p> <p><strong>Downloads :</strong></p> Wafa Hadj Kouider, Abbas Belfar, Houcine Ait-kaci ##submission.copyrightStatement## Wed, 04 Dec 2019 17:46:19 +0100 XRD, SEM and EIS analysis of electroplated Cu-Zn alloy using Zinc oxide <p>Substitution of cyanide in electroplating is a current challenge. We present an alternative method aiming to reduce the toxicity and the cost of electroplating of Cu-Zn alloy (usually prepared from cyanide baths) while maintaining the decorative qualities and anticorrosive properties of the coating. For this purpose, Cu-Zn alloys were obtained in two steps from non-cyanide electrolytes. First, a copper layer electrodeposited onto a nickel under-layer, followed by a thin layer of zinc from three different simple non-cyanide zinc baths. The Zn/Cu/Ni sandwich system was then subjected to heat treatment at a temperature of 400°C, to ensure the diffusion of zinc into the copper layer to give the desired Cu-Zn alloy structure. The synthesized films were characterized by using X-ray diffraction XRD, scanning electron microscopy and energy dispersive X-ray spectroscopy (EDS). XRD demonstrated that the electrodeposited films are crystalline and present the Cu0.7Zn0.3 phase with preferential (111) orientation. An analysis of XRD patterns revealed that after heat treatment, the Cu-Zn alloys were composed of a predominating α-phase structure. The morphology and composition of the coatings depends on the zinc plating bath type. After annealing, well defined pseudo-spherical Cu-Zn grains were formed covering the entire substrate surface. The EDS analysis indicated the formation of Cu0.7Zn0.3 brass alloys, corrosion was studied by impedance spectroscopy. The results showed the feasibility of this low-cost new route for the preparation of good quality Cu–Zn alloys from cyanide-free electrolytes.</p> <p><strong>Keywords:&nbsp;</strong>Electrodeposition; Cu-Zn alloy; Brass; Non-cyanide bath; Heat treatment;</p> <p><strong>Downloads :</strong></p> Ilyes Abacha, Salah Boukhrissa ##submission.copyrightStatement## Sun, 24 Nov 2019 00:00:00 +0100 Synthesis, Characterization and In vitro evaluation of antibacterial and antifungal activities of New Schiff Base and Its Metal Complexes <p>A new potentially pentadentate Schiff base ligand <strong>L</strong> has been prepared via the condensation of diethylenetriamine and 2’-hydroxyacetophenone in the molar ratio of 1:2 in absolute ethanol and characterized by elemental analyses and UV, IR spectroscopy. Mn(II), Ni(II), Co(II), Cu(II),Fe(III),Mg(II),Cd(II) and Zn(II) complexes were prepared by reaction of <strong>L</strong>,dissolved in ethanol, with an appropriate metal salt, have been characterized by UV and IR spectroscopy. Furthermore, the synthesized compounds were screened for antibacterial and antifungal activities. Almost all of these compounds showed moderate to excellent antimicrobial activity against four gram negative bacteria (<em>Escherichia coli</em>, <em>Salmonella typhimurium</em>, <em>Acinetobacter</em><em> baumannii</em> and <em>Citrobacter</em><em> freundii</em>), two gram positive bacteria (<em>Enterococcus faecalis</em> and<em>Lysteria</em><em> monocytogenes</em>), pathogenic fungal strains (<em>Candida albicans</em>, <em>Aspergillus niger, Aspergillus flavus </em>and <em>fusarium </em><em>oxysporum</em>). The activities were confirmed by Activity Index (AI). Activity Index values were found to be higher for Cd(II)&nbsp; followed by Co(II) and the other compounds. The Minimum Inhibitory Concentration (MIC) <strong>L</strong> and its metal complexes were also determined.</p> <p><strong>Keywords:</strong> Schiff base; Complexes; &nbsp;Synthesis; Bacteria; Fungus.</p> <p><strong>Downloads :</strong></p> <p>&nbsp;</p> Salim Madani, Kamel Mokhnache, Azeddine Rouane, Noureddine Charef ##submission.copyrightStatement## Wed, 20 Nov 2019 16:26:28 +0100