Algerian Journal of  Materials Chemistry  

August 24, 2019

Adel Mokhtar1, 2*, Soumia Abdelkrim1, Amal Djelad1, Abdelkader Bengueddach1 & Mohamed Sassi1

1Laboratoire de Chimie des Matériaux, Département de Chimie, Faculté des Sciences exactes et Appliquées. Université Oran1. B.P 1524 El-Menaouer, 31000 Oran, Algeria.

2Département de sciences techniques, Centre universitaire Ahmed Zabana de Relizane, Route de l’hôpital, 48000 Relizane, Algeria

Abstract. In this work, an inorganic-organic nanocomposite material was prepared by combining copper exchanged-magadiite (Cu-magadiite) material with chitosan. The synthesis was carried out by direct dispersion of the Cu-magadiite in the chitosan matrix. The mixture obtained is shaped into beads with an average diameter of about 1~1.2 mm. These beads were then contacted with a solution of NaBH4 in ethanol in order to reduce loaded copper ions into copper nanoparticles species. The resulting nanocomposite material, named Cu-NPs-magadiite/chitosan, was characterized by X-ray diffraction (XRD), Fourier transforms infrared spectroscopy (FTIR), scanning electron microscopy (SEM), Thermogravimetric (TG), UV-Visible diffuse reflectance (UV-Visible DR) and EDX analysis. The results show that the layered silicate magadiite was completely exfoliated confirming the formation of the organic-inorganic composite material. Indeed, the encapsulation of the layered silicate was confirmed by the SEM images, which is presented as micron free aggregates included in the cavities of a continuous polysaccharide matrix. Otherwise, they confirm also the formation of copper nanoparticles (CuNPs) which are probably immobilized inside the magadiite-chitosan solid matrix. The antibacterial activity against Escherichia coli and Staphylococcus aureus of the nanocomposite was highlighted by the disc inhibition method and the minimum inhibitory concentration (MIC) was determined. The CuNPs-magadiite/chitosan nanocomposite material showed a very efficient bactericidal effect against both pathogen E. Coli and staphylococcus bacteria strains. Additionally, the MIC values obtained for nanocomposite are of 0.25 μg/L against S. aureus and of 0.50 µg/L against E. coli. Therefore, encapsulation of low levels of magadiite as a carrier for copper ions in the chitosan matrix has proven to be a good method for developing functional composites that can potentially be applied as antibacterial agents against pathogen gram+ and gram- bacterial strains.

Keywords: Chitosan-magadiite-nanocomposite beads-NaBH4-antibacterial activity.

Vol.2 Issue 1, pp 20–32, (2019)

April 08, 2019

Amar Irekti1*, Mehena Oualit1, Fatima Zibouche1, Dorel Buncianu2

1 Department of Chemistry, Faculty of Sciences, University M’Hamed Bougara de Boumerdes, Avenue de l’indépendance, 35000 Boumerdes, Algeria

2 Université Politehnica Timisoara, Bdul. Mihai Viteazu No.1, Roumanie

Abstract. In the present study six blends of Diglycidyl ether of bisphenol-A and pozzoan filler were synthesized by physical mixing at 100°C. Interaction among epoxide group of DGEBA, composition of fillers and anhydride group of curing agent discussed through FT-IR analysis. The TGA studies revealed a increase in thermal stability and the glass transition temperature (Tg).

The integral procedure decomposition temperature increased from 571,3 °C to 617,9,3°C.  The composites had a higher glass transition temperature than the neat epoxy resin. The coefficient of thermal expansion of the composites at the glassy and rubbery regions decreased with increasing filler content. Scanning electron microscopy (SEM) indicated the presence of two-phase morphology in the blends.

Keywords: DGEBA, pozzolan, thermal behavior , microstructure

Vol.2 Issue 1, pp 14–19, (2019)

April 07, 2019

F.Kheloui1*, K. Ait Tahar 2, Y. Bouamra 2, B. Mougari 1, O. Belaidi 1

1 University Mouloud Mammeri, Faculty of Construction Engineering, civil engineering department,  Laboratory LaMoMS, 15000, Tizi-Ouzou, Algeria.

2 University Akli Mohand Oulhadj, civil engineering department, Laboratory LM2D, 1000, Bouira, Algeria.

Abstract. This study focused on the buckling behavior of an organic source concrete panel reinforced by polymer materials. The concrete was made of a mortar matrix, reinforced with natural reinforcement such as wood sawdust. These panels are reinforced on the faces by a polypropylene fabric and a polymer plate. This technique allows us to give some strength to the panel, to avoid the crumbling of the panel during handling, transport and installation, and to give a finish to the External facing of the wall constituted by the assembly of the various panels. The results are very encouraging and highlight the value of the proposed design of an organic-source mortar panels which have a specific mechanical properties acceptable for their use, low densities, lower cost of manufacture and labor, and above all a positive impact on the environment.

Keywords: Design, Characterization, Multilayer, Buckling, Analysis.

Vol.2 Issue 1, pp 06–13, (2019)

April 07, 2019

Amel Louadj1,*, Omar Bouras1, Benamer Cheknane1, Faiza Zermane1

1Laboratoire Eau Environnement et Développement Durable, Faculté de Technologie, Université Saad Dahlab-Blida 1, BP 270, 09000 Blida, Algérie

Abstract. A new generation of grains based on an iron organo-inorgano montmorillonite complex and gluten (G) as an inert bonding agent called Fe-COIMG and were prepared by the dry compression granulation method.  Their efficiencies were evaluated in tests for the removal of Malachite green cationic dye (MG) by adsorption in fixed bed columns. The effects of dynamic adsorption parameters such as bed depth, initial concentration and inlet flow rate were investigated. The breakthrough curves were exploited by the Thomas and Yoon and Nelson models using nonlinear regression. The corresponding results showed a good agreement with the experimental results obtained indicating that the model predictions were appropriate for the design of the column.

Keywords: Granulation, Pillared clay, Gluten, Malachite Green, Adsorption.

Vol. 2 Issue 1, pp 01–05, (2019)