Journal of New Technology and Materials


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


10

Volumes

20

Numéros

245

Articles


Production and Thermal Characterization of MWCNT Reinforced Polimethyl Methacrylate (PMMA) Nanofibers by Electrospinning

Ekrem Mürsel,  Özten Ünal,  Şahin Ömer, 

Résumé: In this study, the production of weight ratio of 1% multi-walled carbon nanotubes (MWCNT) reinforced / unreinforced Polymethyl Methacrylate (PMMA) nanofiber mats was carried out by electrospinning. PMMA concentration of 10, 12.5 and 15% weight in Dimethylformamide (DMF) solvent used in order to reach optimized electrospinning conditions. PMMA solutions with higher concentration ratio leading to higher viscosity and conductivity properties eliminates defects and imperfections and results improved quality of the products. In addition, different feed rates of 0.25, 0.50 and 0.75 ml/hour with 10 kV applied voltage power were compared for given MWCNT reinforced PMMA solutions electrospinning at specified concentration rate of solution were analyzed. Higher feed rates result thicker nanofiber diameters. Furthermore, Scanning Electron Microscope (SEM) images were investigated to determine the morphological properties of PMMA with MWCNT nanofibers and the average diameter of nanofibers. Optimum production parameters for 15 % wt. ratio and 0.5 ml/hr feed rate for electrospinning of PMMA-MWCNT solution were determined after comparison of results of alternative production options. We produced high quality bead-free nanofibers during electrospinning of PMMA fibers with MWCNT by manipulating dispersion methods, composition rates and electrospinning conditions. Thermal analysis of nanofibers was done by using Differential Thermal Analysis (DTA) and Thermogravimetric Analysis (TGA) in order to obtain Glass Transition Temperature (Tg), Melting Temperature (Tm) and Decomposition Temperatures (Td) with respect to mass loss.

Mots clés: Electrospun, Multi Wall Carbon Nanotubes, Polymethyl Methacrylate, Nanofibers


Grafting of 3 Mercaptopropyl triethoxysilane onto Dodecylamuonium Intercaled Algerian Montmorillonite; Characterizations and Application for Synthesis of Polystyrene/organoclay Hybrid Material by Radical Polymerization

Melouki Azzedine,  Terchi Smail,  Ouali Dhimi, 

Résumé: High grafting efficiency (98%) of 3-mercaptopropyl triethoxysilane (MPTES) onto Algerian montmorillonite was achieved. Before grafting process, the Algerian montmorillonite was sodified, fractionated (<2µm) and intercaled with dodecylamine (DDA) salts. The obtained grafted clay was used to prepare polystyrene/organoclay hybrid material by radical polymerization of styrene monomer. X-ray Fluorescence (XRF) results showed a successful homoionisation of clay and insersion of DDA salts onto montmorillonite. CHN micro-analysis was revealed evolution of the carbon ratio during modification of clay by DDA, grafting and polymerization reactions. Fourier transform infrared (FTIR) spectrums were mainly confirmed the presence of DDA salts, the grafting of MPTES and polystyrene polymer and increasing of hydrophobicity of clay during modifications process (intercalation, grafting and polymerization). The characterization (XRD) was revealed that DDA salts, 3-mercaptopropyl triethoxysilane molecules and polystyrene polymer were respectively intercaled, grafted and polymerized onto montmorillonite galleries by increasing of d001 from 12.69 Å for homoionisated clay to 15.33 Å for intercaled clay and to 21.47 Å for grafted clay and to 25.08 Å for polystyrene/organoclay hybrid material. Thermogravimetic analysis (TGA) showed High grafting efficiency (98%) of MPTES. It showed also that the grafted clay sample have higher thermal stability than intercaled sample and that the thermal stability of prepared organoclay hybrid material is greatly higher than pur polystyrene polymer and that hydrophobicity hybrid organoclay≈ hydrophobicity grafted clay ˃hydrophobicity intercaled clay˃ hydrophobicity fractinated sodic clay. The polymer was recovered by hydrofluoric acid attack, analyzed by FTIR and compared to hybrid organoclay FTIR spectra.

Mots clés: 3-mercaptopropyl triethoxysilane ; Hybrid materials ; Silanes ; Grafting ; Radical polymerization


Sol–gel synthesis of nanocrystalline TiO2 and the investigation of its photocatalytic activity for degradation of methyl orange

Alaounia Nadjette,  Ouchefoune Moussa,  Touam Tahar, 

Résumé: This work presents the successful preparation of titanium dioxide (TiO2) by the sol-gel process in the presence of polyethylene glycol with a molecular weight of 200 g/mol (PEG200) and crystallized after treatment with hot water at 90°C. The photocatalytic decolorization of an azo dye model, methyl orange (MO) in aqueous medium was carried out in a reactor with two UV lamps, using titanium dioxide containing PEG200 as catalyst. We investigated the effect of operating conditions such as initial concentration of MO, the initial concentration of TiO2, the pH of the solution and the addition of NaCl on the degradation of the dye. It was found that the kinetic of degradation of MO depends on the initial dye concentration and initial concentration of TiO2. Moreover, the addition of NaCl did not favor the photodegradation of the dye.

Mots clés: NanocrystallineTiO2 ; sol gel ; photocatalysis ; decolorization ; dye


Optimization of energy valorization from lignocellulosic biomass and their pure woody pseudo-components using a green technology

بوقوس نور الهدى,  عبد الواحد لقمان,  شيخي مصطفى,  طاووق بشارة,  منيعي عبد السلام حسان,  كبابي ابراهيم, 

Résumé: Optimization of air-gasification technology of the lignocellulosic biomass Cistus monspeliensis (CM) and the pure woody pseudo components (cellulose, hemicellulose and lignin) was realized by amplifying experiments in a semi-batch reactor. For each single sample, the effect of the both temperature (750-900°C) and air fraction in nitrogen (0%-48%) on the gasification performance including gas product yield and gas chemical composition were discussed in depth. The results indicated thatthe increase of gasification temperature and air fraction was found to increase the production of gas during the gasification process of biomass, cellulose, hemicelluloses and lignin. CO, CO2, H2 and CH4 are main components of the gas phase. 4% of air was found to be the optimal fraction in the gasification of CM and this value was applied in the gasification of cellulose, hemicellulose and lignin. The gas composition with the highest CO production was obtained from cellulose (48%-51%) at 0% air, while lignin produced more hydrogen and less CH4 than others.

Mots clés: Air-gasification ; Cistus monspeliensis ; semi-batch reactor ; air fraction


Design optimization of SAW temperature sensor based one port resonator using FEM simulation

Belkhelfa Nabila,  Serhane Rafik, 

Résumé: Surface acoustic wave (SAW) sensors fabricated on high-temperature piezoelectric substrates have attracted considerable attention due to their properties. Because it is important to model the SAW devices accurately, a simulation study of Rayleigh wave properties based on a stacked Al/AlN/Si (100) device was achieved, in this paper. Evolution curves of acoustic phase velocity, reflectivity and electromechanical coupling efficiency; for different aluminum (Al) electrode patterns and different piezoelectric aluminum nitride (AlN) layer thicknesses, were elaborated by 2D FEM COMSOL simulations. Added to that, the simulated acoustic mode shapes and the harmonic admittance of the device were represented. The best (AlN) layer thickness and electrode width were 1.5µm and 1µm respectively; they were deduced from the obtained SAW characteristics curves. After that, we used the deduced parameters for the conception of one port resonator temperature sensor working at a frequency of 1.166GHz. Using an elaborated theoretical temperature model coupled to FEM model, frequency shift induced by the SAW device temperature variation was evaluated from the return losses (S11) parameter curves in a range of (-25°C to 200°C). The relative frequency change was about 0.17% and the sensor’s sensitivity was evaluated at 8.53ppm/°C.

Mots clés: Surface Acoustic Wave ; Phase velocity ; Reflectivity ; Return losses ; Temperature coefficient of frequency ; Sensitivity


Comparison of the morphological and chemical composition of particulate matter in the vehicles using gasoline and lpg at idle mode

Hai L. H.,  Hien T. T.,  Chernyshev V. V.,  Kirichenko K. Yu.,  Il’yaschenko D. P.,  Верхотуров Василий,  Ugay S. M.,  Golokhvast K. S., 

Résumé: In this paper we present the results of the measurements and analysis of particulate emissions of vehicles using the conversion system to use both LPG and gasoline fuels. The vehicles (n = 10) were measured using two different methods at the idle mode. The results show that the total number of particles from LPG-fueled vehicles is 1-1.35 times higher than gasoline-fueled vehicles for both PM2,5 and PM10 in most cases. An increase of the metal components in PM of LPG-fueled vehicles compared to gasoline-fueled vehicles, which might be related to lubricant was observed.

Mots clés: PM ; Microparticles; Exhaust ; LPG ; Gasoline ; Idle mode


Identification of volatile components and antioxidant assessment of the aerial part extracts from an Algerian Cistus albidus L. of the Aures region

Fadel Hamza ,  Kebbi Sara ,  Chalchat Jean-claude ,  Figueredo Gilles ,  Chalard Pierre ,  Benayache Fadila ,  , Ghedadba Nabil ,  Benayache Samir , 

Received date: 16-03-2020    Publication date: 24-12-2020    pages  38-46.   
Study of New Antimony Phosphate Glasses

Agti Fatima Zohra ,  Soltani Mohamed Toufik ,  Luis F. Santos ,  Messaoudi Abdelghaffar ,  De.ligny Dominique , 

Received date: 10-06-2020    Publication date: 24-12-2020    pages  64-69.