Journal of New Technology and Materials

jntm

Description

“Journal of New Technology and Materials”(JNTM) is an international peer-reviewed journal that publishes high quality original works on the Material science s (physics, chemistry and life sciences) and engineering. It covers the aspect of materials science and engineering in all forms, particularly materials associated with new technologies (nanoscience and nanotechnology). JNTM provides a platform for researchers, students and industrialist to submit on-going research and developments in material and technology areas. Authors are solicited to contribute to the JNTM by submitting articles that illustrate research results and projects that describe significant advances in all areas covered by our scientific journal (JNTM). More informations are available on : https://sites.google.com/site/jntmjournal, ....... Citation on Google Scholar: https://scholar.google.fr/citations?user=bNBJ-50AAAAJ&hl=fr


9

Volumes

17

Numéros

216

Articles


Synthesis, characterisation and antimicrobial activity of a new 1,3-bis (4-fluorophenyl)-5-butyl-1,3,5-triazacyclohexane

فرحاتي امال, 

Résumé: In this paper, a new hexahydrotriazine derivative which have the structure 1,3-bis(4-fluorophenyl)-5-butyl-1,3,5-triazacyclohexane was synthesized by the condensation reaction of a 1 :2 :1 ratio, 4-fluoroaniline and butylamine with formalin in a basic solution. The synthesized compound was characterized by elementary analysis and spectroscopic methods IR, UV, mass spectroscopy, 1H and 13C NMR. The new triazacyclohexane has been screened for its antimicrobial activity against Gram positive and Gram negative bacteria by the diffusion on agar medium.

Mots clés: triazacyclohexane ; formalin ; butylamine ; antimicrobial activity ; condensation


Transmission and Q-factor improvement in 2D square photonic crystal demultiplexer

Mirouh Fatima Zohra,  Lebbal Mohamed Redha,  Bouchemat Mohamed,  Bouchemat Thouraya, 

Résumé: Our novel designed structure is a demultiplexer of 2D square photonic crystal (PC) of circular rods embedded in air in which we have created three resonant cavities with different radiuses. So we have three channels based on these cavities which have been implemented to realize the desired demultiplexer structure. The three radiuses of cavities deduce us to obtain three different output resonant wavelengths; it means that this structure drops the desired wavelength depending on the cavity radius. The refractive index n that we will use in this study have a constant value, n = 3.3763. In addition, we had optimized this structure by the variation of the adjacent rods radiuses and positions for each of these cavities. The obtained result is a structure with geometrically three different resonance zones. Then, we were being able to extract three resonant wavelengths characterized by a high transmission power T and Q-factor which the mean values are 91% and 4247 respectively. We denote that this resulting T and Q-factor are higher than those investigated in bibliography.

Mots clés: Photonic Crystal ; Demultiplexer ; 2D-FDTD ; Cavity ; Q-factor


Beneficial effect of gallic acid on oxidative stress and chronic hepatotoxicity induced by carcinogenic benzopyrene in rats.

بن شويب إلهام,  لحول مصباح, 

Résumé: Benzo[a]pyrene is an environmental pollutant, well known for its powerful genotoxic and carcinogenic effects in various organs. Gallic acid, a widely distributed phenolic acid, possesses strong antioxidant, anti-inflammatory and anti-carcinogenic activities. This study investigated the effects of gallic acid on chronic liver injury induced by benzo[a]pyrene in Wistar rats. The intoxicated group received an intraperitoneally single dose of benzo[a]pyrene at 100 mg/kg, while the treated animals were intraperitoneally injected with benzo[a]pyrene at 100 mg/kg and then they orally received gallic acid at 100 mg/kg per day for five consecutive days. The liver toxicity was assessed by evaluation of the serum hepatic markers (alanine aminotransferase and aspartate aminotransferase), the enzymatic and nonenzymatic oxidative stress indicators and the histopathological changes. The benzo[a]pyrene administration increased the levels of malondialdehyde with a concomitant decrease in superoxide dismutase, glutathione-s-transferase and glutathione. Parralelly, liver histological alterations were observed. The animals treatment with gallic acid restored the alterations in liver tissues, decreased lipid peroxidation and serum marker enzyme activity and significantly improved the overall antioxidant capacity, suggesting that gallic acid was responsible of a beneficial effects against oxidative stress and hepatotoxicity induced by benzo[a]pyrene in rat.

Mots clés: Carcinogen ; benzopyrene ; gallic acid ; oxidative stress ; hepatotoxicity ; rat


Influence of Cold Deformation on the Aging Behavior of the Al-Mg-Si alloy

Aouabdia Youcef, 

Résumé: The aim of the present work is to study the effect of the cold deformation followed by heat treatment on the microstructure and the mechanical properties of the alloy Al-Mg-Si. Differential scanning calorimetry indicates that precipitation of the metastable β" phase occurs in the temperature range (220-260 °C) for the solution treated and then quenched alloy to room temperature. The exploitation of the DSC curves by the Kissinger method has shown that the activation energy value of the precipitation reaction is about 83.1 k J / mole. The amount of 30% cold deformation before ageing indicates that the first dissolution reaction at about 50 ° C and the precipitation temperature is around 240 °C. Microstructural studies, of the aged cold-deformed sample, revealed the presence of fine precipitates embedded in the aluminium matrix. At as quenched state of the alloy reveals an aging response. The increase of the microhardness with the decrease of the elongation is mainly due to the severe strengthening by deformation, andnot due to the effect of precipitation hardening.

Mots clés: Cold deformation ; Alloys AlMgSi ; Activation energy ; β' phase ; Precipitation


Crystallographic characterization of the spinel system CuyCryZr2-ySe4 by X-ray diffraction

بن الشيخ راضية,  بلعكروم كريمة, 

Résumé: Polycrystalline CuCr2Se4 spinels with Zr admixtures have been prepared by solid-state reaction, with an aim to study the influence of zirconium concentration on the cation distribution of the Cu-Cr-Zr-Se system. A series of samples of the chemical composition CuyCryZr2-ySe4 (y = 1.00, 1.15, 1.20, 1.25 and 1.30) have been studied by x–ray diffraction. The structural refinements have been performed according to the Rietveld method. In the system CuyCryZr2-ySe4 (y = 1.05, 1.15, 1.20, 1.25 and 1.30), the formula indicates a copper excess with respect to the ideal spinel composition. It is important to point out that CuyCryZr2-ySe4 retains the normal cubic spinel structure with increase in Cr substitution up to y = 1.0, with space group Fd3 ̅m. The formula of the spinel system CuyCryZr2-ySe4 indicates a copper excess, with respect to the ideal spinel composition. The question whether short metal-metal distances is discussed. It was found that the lattice parameter decreases with increasing y, and it doesn’t obey Vegard’s law. Also the variation of the cation distribution has been discussed on the basis of site preference, and the substituting cations. The data given in this paper provide structural support for further studies on magnetic measurements and explanations of the interesting properties of this family of compounds.

Mots clés: CuyCryZr2-ySe4; ; spinel structure; ; Rietveld refinement; ; X-ray powder diffraction


Analysis of crack behavior in an Epoxy-fiber composite under thermal and thermo-mechanical loading

شهراوي يمينة, 

Résumé: The mechanical behavior of composites depends on commissioning stresses and environmental conditions of use. They are usually subjected to complex mechanical loadings. Their endurance and their lifespan require knowledge of their behavior under such solicitations. The fiber-matrix junction is usually made at high temperatures. When cooling this junction to ambient temperature, internal stresses arise from the difference in the thermal expansion coefficients between the matrix and the fibers. The combination of these stresses with those of commissioning determines the reliability and the performance of the composite. In this study, a numerical model has been developed to analyze the effect of this combination on the lifetime in terms of stress intensity factors variation in modes I and II at the heads of an initially interfacial crack. An epoxy matrix reinforced with fibers. This variation is analyzed according to the orientation of the crack, the intensity of commissioning stresses, the elaboration temperature of the composite, of the combination of stresses of commissioning-internal stresses, the nature of the fibers and their volume fraction.

Mots clés: Epoxy matrix composite; oriented crack; stress intensity factor; Residual stresses; finite element analysis.


Investigation and comparison of electrical and optical properties of RF sputtered Cu doped ZnO and ZnO/Cu/ZnO multilayer films

Zaabat Sara,  Challali Fatiha,  Chakaroun Mahmoud,  Boudine Boubaker,  Boudrioua Azzedine, 

Résumé: This study presents the comparison of structural, electrical and optical properties of Cu doped ZnO films and ZnO/Cu/ZnO multilayer films before and after annealing, they are produced via radio frequency magnetron sputtering. the results showed that all films has a good crystalline properties after annealing, ZnO/Cu/ZnO multilayer films showed low resistivity of 1.8 × 10-3 Ω.cm and an average transmittance of 75%, these parameter values indicate that films are a potential candidate for high-quality electrodes in various displays.

Mots clés: ZnO:Cu ; multilayers ; resistivity ; transmittance ; sputtering


Growth rate influence on indium oxide thin films grown by an ultrasonic spraytechnique.

Attaf Abdallah ,  Azizi Rahil ,  Saidi Hanane ,  Benkhetta Youcef ,  Bouhaf Kherkhachi Imane ,  Attaf Nadir ,  Dahnoun Mohamed , 

Received date: 20-02-2019    Publication date: 04-07-2019    pages  81-88.