2016
Experimental and Theoretical Study of Tetracaine-Hydrochloride β-Cyclodextrin Complexation
La revue : Journal of Materials and Environmental Sciences
Domaine : Materials and Environmental Sciences
Mots Clés : Complexation, Tetracaine hydrochloride, 1H-NMR, β-Cyclodextrin, UV-Visible Spectrophotometry, quantum calculations
Auteur : M.A. Nouairi, T. Fergoug, M. Azayez, H. Boujoures, C. Zelmat, Y.Bouhadda
Issn : ISSN: 2028-2508 Eissn : vol : Volume 8, Num : issue 5, pp : 1589-1598
Résume :

The complexation of the drug Tetracaine-hydrochloride (TC,HCl) with β- cyclodextrin (β-CD) was studied by means of UV-Visible Spectrophotometry and positive electrospray ionization mass spectrometry ESI+/MS and 1D 1H-NMR. The experimental results confirm that an inclusion complex was formed between the drug and β-CD and that the cationic end of the guest molecule is inserted into β-CD cavity. Quantum semi-empirical calculations were performed to determine the best inclusion pathway between the cationic Tetracaine and the β-CD. Potential energy scan showed that the most stable inclusion complex is obtained when the guest molecule is inserted with its ammonium group into the cavity of β-CD from its wider rim in accordance to experimental results.

2021
Organoclay/conjugated polymer nanocomposites: structural, thermal, and electrical properties
La revue : Colloid and Polymer Science
Domaine : Polymer chemistry
Mots Clés : Organoclay,conjugated polymer, nanocomposites, structural, thermal, and electrical properties
Auteur : Leila Mouacher, Ahmed Yahiaoui, Aicha Hachemaoui, Abdelkader Dehbi, Ali Mustapha Benkouider
Issn : 0303-402X Eissn : 1435-1536 vol : 299, Num : 05, pp : 763–772
Résume :

A detailed study about the chemical oxidative polymerization of aniline with/or 2-aminothiazole in the presence of an organoclay has been reported. The first step achieved was the organophilization of the clay by using cetrimonium bromide (CTAB) surfactant; then, the nanocomposites were synthesized with the addition of a stoichiometric amount of ammonium persulfate (APS) in aqueous solution. The effect of varying the reaction time and oxidant/monomer and co-monomer molar ratio on the polymer yield was investigated. The resulting nanocomposites were fully characterized using FTIR and UV-Vis measurements which have shown that polymerizations have been carried out. XPS has certified that the clay has undergone a cationic exchange of sodium by the cationic surfactant. X-ray diffraction confirmed that polymers/copolymers were largely incorporated into the clay. Good electrical response and improved thermal stability for the synthesized nanocomposites have been observed.

2017
Synthesis of a Conducting Nanocomposite by Intercalative copolymerisation of Furan and Aniline in Montmorillonite
La revue : Intern. Polymer Processing
Domaine : nanocomposite
Mots Clés :
Auteur : O. Saiah, A. Hachemaoui, A. Yahiaoui
Issn : ISSN 0930-777X Eissn : vol : 04, Num : , pp : 515–518
Résume :

Herein, we describe the synthesis of polyfuran, polyaniline, and their copolymer nanocomposites by in-situ oxidative polymerisation of corresponding monomers in the presence of montmorillonite, using ammonium persulfate as an oxidant. The obtained nanocomposites were characterised by Fourier- transform infrared spectroscopy, X-ray diffraction analysis, and UV-vis spectroscopy.

2015
1. A new synthetic approach synthesis of bis-macromonomers of polyepichlorhydrin by exchanged montmorillonite.
La revue : Journal of Chemical and Pharmaceutical Research
Domaine : Chimie
Mots Clés : Maghnite, Montmorillonite, Catalyst, Epichlorhydrin, Macromonomer, Polyepichlorhydrin, Methacrylic Anhydride.
Auteur : H. Mekkaoui , A. Yahiaoui, A. Hachemaoui , A. M. Benkouider and Mohammed Belbachir
Issn : 0975-7384 Eissn : vol : 9, Num : 7, pp : 933-944
Résume :

The polymerization of epichlorhydrin (ECH) catalyzed by Maghnite-H+; (Mag-H+), a montmorillonite sheet silicate clay exchanged with protons, was investigated. The cationic ring-opening polymerization of epichlorhydrin was initiated by Mag-H+ at different temperatures ( 20, 30, 40, 50 and 60°C) in bulk and in a solvent. The effects of the amount of Mag-H+ and the temperature were studi ed. The polymerization rate and the average molecul ar weights increased with an increase in the temperatu re and the proportion of the catalyst. These result s indicated the cationic nature of the polymerization and suggested that the polymerization was initiated by proton addition to the monomer from Mag-H+. Moreover, we used a simple method, in one step in bulk and in solution at room temperature (20°C), to prepare a telechelic bismacr omonomer: α,ω-bisunsaturated polyepichlorhydrin. The telechelique polymer was characterized by means of 1H-NMR, FT-IR spectroscopy, UV and GPC

2019
Adsorption of Zinc and Lead onto Sediments of the Dam Chorfa
La revue : Journal iranien de chimie et de génie chimique (IJCCE)
Domaine :
Mots Clés :
Auteur : Mohamed El-Amine Bekhti, Ahmed Yahiaoui, Aicha Hachmaoui, Abdelghani Benyoucef
Issn : 1021-9986 Eissn : vol : 38, Num : 6, pp : 127-133
Résume :

Au niveau du laboratoire, nous avons étudié les effets de divers facteurs, la concentration initiale d'ions métalliques, le pH de la solution, la quantité de boue utilisée et le temps de contact, sur l'adsorption des ions zinc et plomb sur le matériau du barrage (Mascara, Algérie ). Les constituants des sédiments limoneux sont le quartz, la calcite et un mélange d'argiles. Le temps d'équilibre était de l'ordre de 60 min. Le diagramme d'adsorption est lisse et continu conduisant à la saturation, suggérant la possible couverture monocouche d'ions zinc et plomb à la surface de l'adsorbant. Le degré d'adsorption augmente avec l'augmentation du pH. De plus, l'adsorption des métaux augmente avec l'augmentation de la quantité d'adsorbant. La modélisation de l'adsorption a été réalisée en utilisant les modèles d'adsorption de Langmuir et Freundlich pour déterminer les paramètres mécanistiques associés au processus d'adsorption. Le modèle isotherme Langmuir-Freundlich était le meilleur pour décrire les données expérimentales. La capacité de sorption maximale s'est avérée être de 42,73 et 131,57 mg/g pour le Zn2+ et le Pb2+, respectivement.

2021
Amélioration de la stabilité thermique, des propriétés optiques et électrochimiques de la matrice PANI contenant des matériaux hybrides Al 2 O 3 synthétis
La revue : Composites polymères
Domaine : matériaux
Mots Clés :
Auteur : MA Bekhti, MS Belardja, M Lafjah, F Chouli, A Benyoucef
Issn : 1548-0569 Eissn : vol : 42, Num : 1, pp : 127-133
Résume :

Des matériaux hybrides à base d'Al 2 O 3 , modifiés avec de la polyaniline ont été obtenus. Des échantillons ont été synthétisés par polymérisation chimique de monomère d'aniline avec des nanoparticules d'Al 2 O 3 , le persulfate d'ammonium a été utilisé comme oxydant. Les échantillons résultants ont été entièrement caractérisés par spectroscopie photoélectronique aux rayons X (XPS), diffraction des rayons X (XRD), spectromètre infrarouge à transformée de Fourier (FTIR), microscopie électronique à balayage (SEM) et spectroscopies UV-vis, qui ont montré que les polymérisations ont été réalisées. Il est important de noter que ce travail représente un moyen efficace de définir les propriétés optiques des nanocomposites synthétisés, obtenus en ajustant les quantités d'Al 2 O 3pendant la polymérisation,

2012
Chemical synthesis and characterization of a new soluble conducting polymer
La revue : Synthetic Metals
Domaine : Chimie
Mots Clés :
Auteur : H. Gherras, A. Hachemaoui, A. Yahiaoui, A. Benyoucef, A.Belfedal, M.Belbachir
Issn : 03796779 Eissn : vol : , Num : , pp :
Page web de l'auteur

-0001
Poly [(pyrrole-2, 5-diyl) co (4-Nitro benzylidene)]: A new synthetic approach and electronic properties
La revue : MaterialsScienceandEngineering
Domaine : Chimie
Mots Clés :
Auteur : H. Gherras, A. Hachemaoui, A. Yahiaoui, M. Belbachir , A. Belfedal
Issn : Eissn : vol : , Num : , pp :
Résume :

A new poly (heteroary1ene methylene) containing one to four -pyrrole rings alternating with an sp3-carbon atom in the main chain were synthesized and characterized. The synthesized poly [(pyrrole-2, 5-diyl)-co-(4-nitrobenzylidene)] was found to be highly dehydrogenated, thus resulting in black materials with conjugated segments larger than a single pyrrole ring. The conjugated polymers containing alternating aromatic and quinoid heteroarylene moieties in the main chain were prepared by polycondensation of 4-nitrobenzaldehyde and pyrrole catalysed by Maghnite-H+.

2015
3. Morphological and physicochemical properties of dip-coated poly (2,5-diyl pyrrole) [4-nitrobenzylidene] (PPNB) thin films: towards photovoltaic applications
La revue : Eur. Phys. J. Appl. Phys
Domaine : Chimie
Mots Clés :
Auteur : Y. Mouchaal, H. Gherras, A. B. Reguig, A. Hachemaoui, A. Yahiaoui, M. Makha, A.Khelil, J-C. Bernede
Issn : Eissn : vol : , Num : , pp :
Résume :

A new material: conjugated poly {(2,5-diyl pyrrole) [4-nitrobenzylid`ene]}, that we called (PPNB), has been synthesized and characterized. The cyclic voltammetry has been used in order to estimate first oxidation (Ep) and reduction (En) potentials of our polymer. These values have been assigned, respectively, to the position of the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) and determination of the energy band gap which have been estimated to be 6.16, 3.89 and 2.27 eV respectively.

2017
Synthesis of new nitrobenzylidene derivatives and pyrrole-based copolymers for dye-sensitized solar cells: effect of substituent on opto-electrical properties of dip-coated thin films
La revue : Surface Review and Letters
Domaine : Chimie
Mots Clés :
Auteur : A. Remil, Y. Mouchaal , A. B. Reguig, A. L. Toumi, h. Gherrass, A. Hachemaoui, A. Yahiaoui , A. Khelil
Issn : Eissn : vol : , Num : , pp :
Résume :

The mastery of the optoelectronic properties of conjugated copolymers by substituting their radicals is a promising way for increasing the light absorption and charge career transport in the organic devices active layer. In this paper, we present the chemical synthesis of four di®erent conjugated benzaldehyde derivatives and pyrrole-based copolymers (P–P:B) followed by their conception in thin ¯lms on glass substrates by dip coating root from a solution in dichloromethane.

2018
Synthesis and characterization of poly (2,5-diyl pyrrole-2-pyrrolyl methine) semiconductor copolymer
La revue : Journal of Semiconductors
Domaine : Chimie
Mots Clés : proposed technique; Maghnite-H+ catalyst; conducting PPPM copolymer; pyrrole; pyrrole-2-carboxaldehyde
Auteur : H. Gherras, A. Yahiaoui, A. Hachemaoui, A. Belfedal, A. Dehbi, A-H I. Mourad;
Issn : Eissn : vol : 39, Num : 09, pp :
Résume :

In the current research, the proposed technique to synthesise poly {(2,5-diyl pyrrole) (2-pyrrolyl methine)} (PPPM) copolymer by condensation of pyrrole and pyrrole-2- carboxaldehyde monomers catalyzed by Maghnite-H+ is introduced. The protons are exchanged with Maghnite-H+, which is available in the form of a montmorillonite silicate clay sheet. The effect of several parameters such as time and temperature of copolymerization, [pyrrole]/[pyrrole-2-carboxaldehyde] molar ratio, amount of Maghnite-H+, and solvent on the produced poly (2,5-diyl pyrrole-2- pyrrolyl methine) semiconductor copolymer material (yield%) was investigated.

2019
Synthesis and characterization of poly(pyrrole-co-2-nitrocinnamaldehyde) (PPNC), a new copolymer for solar cells applications
La revue : Polymers and Polymer Composites
Domaine : Chimie
Mots Clés : Copolymer synthesis, solubility, poly(pyrrole-co-2-nitrocinnamaldehyde), pyrrole, 2-nitrocinnamaldehyde
Auteur : H. Gherras, A. Yahiaoui, A. Hachemaoui, A. Belfedal, A. Dehbi, A. Zeinert
Issn : Eissn : vol : , Num : , pp :
Résume :

The use of conductive polymers as a substitute for metallic conductors and semiconductors has attracted much attention in the literature. In particular, aromatic heterocyclic polymers constitute an important class since they possess chemical and electrical stability in both the oxidized (doped) and neutral (undoped) state. A series of poly(pyrrole-co-2-nitrocinnamaldehyde) were obtained via the condensation of pyrrole and 2-nitrocinnamaldehyde in chloroform using acid exchanged montmorillonite clay called maghnite-Hþ as an efficient catalyst. The conjugated copolymer was characterized using proton nuclear magnetic resonance, ultraviolet–visible spectroscopy, Fourier transform infrared spectroscopy, and scanning electron microscopy.

2020
Fabrication and Characterization of Poly (aniline-co-4-bromoaniline)/Сlay Nanocomposite
La revue : Polymer Science, Series B
Domaine : Chimie
Mots Clés : Copolymer synthesis, solubility, poly(pyrrole-co-2-nitrocinnamaldehyde), pyrrole, 2-nitrocinnamaldehyde
Auteur : N. E-h. Bouabida, A. Hachemaoui, A. Yahiaoui, H. Gherras, A. Belfedal, A. Dehbi, , A. H I. Mourad
Issn : 1560-0904 Eissn : vol : 62, Num : 02, pp :
Résume :

Poly(aniline-co-4-bromoaniline) nanocomposites were prepared via in situ polymerization in different molar ratio in the presence of Cu2+−monmorillonite. The X-ray diffraction confirmed that the basal space of Cu2+−montmorillonite increased after the organophilization. Poly(aniline-co-4-bromoaniline)/ Cu2+−monmorillonite nanocomposites were prepared by intercalating of aniline and 4-bromoaniline with treated organically layers of Cu2+−monmorillonite following by polymerization initiated by ammonium peroxdisulfate. The nanocomposites were characterized by FTIR, XRD, and UV–Vis spectroscopy.