Publications Internationales

Permanent URI for this collectionhttps://dspace.univ-boumerdes.dz/handle/123456789/13

Browse

Subject: search.filters.subject.Composite

Search Results

Now showing 1 - 9 of 9
  • Thumbnail Image
    Item
    Physical, mechanical and thermal properties of Spanish broom (Spartium junceum L.) fibre reinforced unidirectional polyester composites
    (SAGE, 2025) Djerad, Abdelkader; Benhamadouche, Lamia; Moussaoui, Nafissa; Bennouioua, Tahar; Jawaid, Mohammad
    This research analyses Spanish broom fibres (Spartium junceum L.) as possible reinforcement in polymer composites. It includes fibre extraction, characterisation, and composite construction. We extracted the Spanish broom fibres by water retting for 30 days, followed by hand washing and air drying. The fibres were spun into skeins using circular spinning. The fibres exhibited a density of 1.27 ± 0.03 g/cm3 and an average diameter of 170 ± 1.80 μm. The SEM investigation revealed a rough, uneven surface with microfibrils and spaces, that are typical of lignocellulosic fibres. Cellulose, hemicellulose, and lignin were detected using FTIR analysis. TGA revealed three weight-reduction phases, with the most significant cellulose degradation temperature around 319°C. XRD analysis revealed a 48.09% crystallinity index and 15.7 nm crystallite size. Single fibre tensile testing showed an elastic modulus of 20.51 ± 5.30 GPa, a fracture stress of 486.17 ± 129.16 MPa, and a fracture strain of 1.57 ± 0.43%. Spanish broom yarn and polyester resin were used to create unidirectional composites. Results indicate that both unreinforced polyester and SJL fibre-reinforced composites have enhanced mechanical characteristics, with maximum stress of 29.79 ± 0.79 MPa and Young’s modulus of 3.10 ± 0.25 GPa. This work highlights the significance of employing Spanish broom fibres as a green reinforcing material for polymer composites and suggests future research options
  • No Thumbnail Available
    Item
    Nanofibrous PANI/TiO2 Composite Synthesized with Sea Urchin-Shaped MnO2 Nanostructure for High-Performance Pseudocapacitors
    (Springer, 2023) Makhloufi, Mohamed Cherif; Benhaddad, L.; Djelali, N.E.; Metref, F.; Amrane, C.; Hamidouche, F.
    This study presents a novel approach for the fabrication of polyaniline (PANI) and its composite polyaniline/titanium dioxide (PANI/TiO2) with a unique porous nanofibrous morphology that exhibits excellent performance for supercapacitor applications. The synthesis method involves a facile chemical oxidative polymerization of aniline monomer using nanostructured MnO2 powder, synthesized via a hydrothermal method, as an oxidizing agent in the presence of TiO2 nanoparticles under acidic conditions. The morphology, composition, and structure of the fabricated powders are comprehensively characterized using scanning electron microscopy (SEM) combined with an energy dispersive spectroscopy (EDX), X-ray diffraction (XRD), and Fourier transform infrared spectra (FTIR). Electrochemical performance measurements, including cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS), demonstrate that the as-prepared PANI nanofibers exhibit a specific capacitance of 800.25 F/g at a scan rate of 5 mV/s, which is attributed to the nanofibrous morphology that provides rapid charge transfer and easy electrolyte ions diffusion. Furthermore, the incorporation of TiO2 nanoparticles into the PANI matrix enhances the electrical conductivity and electrochemical stability, resulting in a high specific capacitance of 1110 F/g at a scan rate of 5 mV/s, while maintaining the cyclic stability with a retention rate of 95.3% after 1000th cycles. These results suggest that the as-prepared powders hold great potential for high-performance supercapacitor applications.
  • No Thumbnail Available
    Item
    Analysis of the bauschinger effect on a multilayer helicopter blade by XFEM simulation
    (Elsevier, 2017) Nour, Abdelkader; Gherbi, Mohamed Tahar; Tawfiq, Imad
  • No Thumbnail Available
    Item
    Thermoelectrical characterization of new material based on PANI/zeolite HY composite, used for the detection of carbon dioxide
    (Nature Publishing Group, 2013) Safidine, Zitouni; Ghebache, Zahra; Lamouri, Saad
  • No Thumbnail Available
    Item
  • No Thumbnail Available
    Item
    Preparation and characterization of foam glass based waste
    (2011) Stiti, N.; Ayadi, A.; Lerabi, Y.; Benhaoua, F.; Benzerga, R.; Legendre, L.
  • No Thumbnail Available
    Item
    γ-Ray irradiation effect on GdBO3/silica:Ce3+ composite prepared by sol gel method
    (Elsevier, 2015) Ladjouzi, S.; Tala-Ighil, Razika; Iratni, A.; Izerrouken, M.; Guerbous, L.; Hadji, S.; Bensouici, F.; Pérez, F.J.
    Samples of GdBO3 doped with Ce3+ embedded in amorphous silica matrix were obtained by sol gel process and heat-treat at 1000°C for 2h in argon atmosphere. After elaboration, the samples were irradiated with γ-rays using cobalt (60Co) source in the dose range from 1 to 5kGy. The irradiation effect of γ-rays on structural and optical properties of the synthesized samples were investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transforms infrared spectroscopy (FTIR) and photoluminescence spectroscopy. XRD and TEM-EDS results reveal that γ-ray irradiation reduces the crystallite size from 55nm to 30nm. It is found from FTIR study that the absorption bands intensity assigned to structural groups containing BO4 and BO3 units as well as the banding of Si-O-Si bond increases with γ-ray dose up to 4kGy. While photoluminescence measurements show that the emission bands attributed to the 5d→4F transition of Ce+3 ion intensity decreases, it is still significant even after irradiation to a dose of 5kGy. From this results it is concluded that the γ-ray irradiation up to a dose of 5kGy improve the structural and morphological quality of the synthesized GdBO3/silica: Ce3+ without altering significantly its luminescence properties.
  • No Thumbnail Available
    Item
    Experimental study for the choice of a matrix epoxy resin for the elaboration of laminates
    (2013) Aribi, C.; Bezzazi, B.; Mir, A.
    The performances of composite materials are influenced by the properties of the matrix used. The latter ensures the desired form and the protection of the reinforcements against the external attacks. This work comprises a comparative study between laminates developed with different matrices in epoxy resin. Their characterization has to choose the best matrix able to give best results in static and dynamic tests. The resins used are provided by Granitex Algéria and which are primary Médapoxy STR resins, Médapoxy inject 812 and Médapoxy Al resin. Hence, the results of tensile tests prove a fragility of the AL resin which influences the maximal constraint of traction compared to the STR primary resin. Furthermore, Inject 812 resin shows very limited mechanical properties due to the changes of the epoxy network with the addition of diluents which has significantly decreased its viscosity
  • No Thumbnail Available
    Item
    Elaboration and characterization of foam glass based waste Asian
    (2011) Ayadi, A.; Stiti, N.; Benhaoua, F.; Lerari, Y.; Benzerg, R.; Legendre, L.
    The porous glass ‘foam glass’ is considered as the new glass products fulfill certain requirements in the building industry in particular (thermal and acoustic insulation). The production of foam glass based waste glass plays an important role in environmental protection and also gains in energy. As part of present work, we seek to improve the properties of glass to obtain a building material lighter with excellent insulation properties. The properties of foam glass depend on the porosity and morphology. The present work devoted to analyze the microstructure of the glass produced by scanning electron microscopy and optical microscopy to be more precise on the size and shape of pores constitute this material