Mohamed Abou-Salama- PhD
- Enseignant-Chercheur at Mohamed I University
Mohamed Abou-Salama
- PhD
- Enseignant-Chercheur at Mohamed I University
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70
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Publications (70)
A series of Imidazo[1,2-a]pyridine-Schiff base derivatives were synthesized and characterized using ¹H NMR, ¹³C NMR, Mass Spectrometry and FTIR techniques, and the structure of 4a was further confirmed through single-crystal X-ray diffraction analysis. Density Functional Theory (DFT) has been used to investigate the structural and electronic proper...
Solid-state processing was used to synthesize tungsten bronze type (TTB) solid solutions, specifically Sr2Sm(Ti1-xZrx)2Nb3O15 with x values of 0, 0.2, 0.3, and 0.4. The study examined the crystalline structure, optical properties, morphology, and electrical and dielectric characteristics of these compounds. X-ray diffraction revealed a tetragonal s...
Ceramics of (Ba1−xSrx)2SmTi2Nb3O15, denoted as BSxSTN (x = 0, 0.25 and 0.5), were synthesized by the conventional solid-state reactions route. The impact of Sr-substitution in Ba2SmTi2Nb3O15 ceramics on their structural, optical, and dielectric properties are investigated. The Rietveld method was employed to confirm the formation of tetragonal tung...
In this paper, the dispersion encapsulation was investigated as new process to elaborate the principal active (PA) loaded biodegradable plastic coacervates, which designs a model of vector system and drug delivery matrix. The Rosemary Essential Oil (REO) (~ 54%w) was wrapped, as PA-model, in Benzyl cellulose acrylate (BCac, DSBnz ~ 1.4 and DSAcr ~...
Dissolution mechanism of cellulose in a benzyltriethylammonium/urea deep eutectic solvent (DES): DFT-quantum modeling, molecular dynamics and experimental investigation
The effects of Na+ substitution by Y3+ on the structural, microstructural, dielectric and electrical properties of Ba2Na(1-3x)YxNb5O15 compositions with (x= 0, 0.02 and 0.04 ) have been studied in detail. The solid solutions of different compositions were prepared by the solid state reaction route method and characterized by X-Ray Diffraction (XRD)...
In this paper, a benzyltriethylammonium/urea DES was investigated as a new green and eco-friendly medium for the progress of organic chemical reactions, particularly the dissolution and the functionalization of cellulose. In this regard, the viscosity-average molecular weight of cellulose (M̄w) during the dissolution/regeneration process was invest...
In this paper, the “ Dispersive Coacervation (D-Coac) ” was investigated as new process to elaborate new Rosemary Essential Oil (REO) dispersion-loaded biodegradable plastic coacervates. The active principle (REO) is coated using D-Coac as a model process for designing vector systems and drug delivery matrix. The REO (~ 54%w) was wrapped in Benzyl...
Novel ceramic membrane filters were manufactured from kaolino-illitic clays and calcareous algae (up to 20 wt.%) as porogenic agent. The produced membranes were investigated using X-ray diffraction, thermogravimetric analysis, scanning electron microscope, impedance spectroscopy, and Fourier-transform infrared spectroscopy. All of the filtration su...
Ceramics of (Ba1−xSrx)2SmTi2Nb3O15, denoted as BSxSTN (x = 0, 0.25 and 0.5), were synthesized by the conventional solid-state reactions route. The impact of Sr-substitution in Ba2SmTi2Nb3O15 ceramics on their structural, optical, and dielectric properties are investigated. The Rietveld method was employed to confirm the formation of tetragonal tung...
This paper presents a systematic study of the substitution effect by lanthanides (Ln3+=Sm3+ and La3+) in the A-site of perovskite Ba(1-x)Ln2x/3(Ti0.99Zr0.01)O3 with a substitution rate equal to 3.4%. All samples were synthesized by the classical solid-state reaction route and characterized by X-ray diffraction and complex impedance spectroscopy tec...
Ceramics (Ca0.9Sr0.1)1-xLa2x/3Cu3Ti4O12 (CSLCTO) with x = 0, 0.025, 0.05 and 0.075 were successfully synthesized by the solid state reaction method. The structure, microstructure and grain size were analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM) respectively. The dielectric response of the synthesized ceramics was evalua...
Eco-friendly ceramic membranes have been developed from clayey materials mixed with biobased additives (woodworking waste and rice husk) as pore-forming agents. Heated blends of two clayey occurring materials with the biobased additives (up to 20 wt%) were investigated using X-Ray Fluorescence spectrometry (XRF), X-Ray Diffraction (XRD), Thermograv...
The aim of this study is to develop a new, efficient, and inexpensive natural-based adsorbent with high efficacy for the cationic dye methylene blue (MB). A natural-based nanocomposite based on hydroxyapatite (HAp) and hydroxypropyl methylcellulose (HPMC) was selected for this purpose. It was synthesized by the dissolution/reprecipitation method. A...
In this paper, a new green pH-sensitive EDTA crosslinked HEC (cellulose-based hydrogel (swelling rate ~ 1005%)) adsorbent was successfully elaborated. The synthesis of HEC-EDTA at the high advanced crosslinking degree (up to 92%), was carried out using DAEDT and DMAP as acyl transfer agent, where the lamellar morphology (2D-microstructure) was high...
Undoped Ba(Zr0.9Ti0.1)O3 and rare-earth-doped (Ba1-x RE2x/3)(Zr0.9Ti0.1)O3 (RE3+ = La3+, Sm3+) perovskite compounds were synthesized by the conventional solid-state reaction route. Both solubility of rare earth in Ba(Zr0.9Ti0.1)O3 and formation of perovskite structure with the Pm3̄m space group were verified by the Rietveld method using X-ray diffr...
Ba4(Nd1-xSmx)28/3(Ti0,95Zr0,05)18O54 ceramics with (x = 0; 0.2; 0.4; 0.8 and 1) were synthesized by solid method at 1250 °C for 10 h. The effects of Nd/Sm ratio on the structure and dielectric behavior were studied by changing the value of x. The study of Ba/RE order with (RE = Nd and Sm) in the solid solution Ba4(Nd1-xSmx)28/3(Ti0,95Zr0,05)18O54 w...
In this paper, a new deep eutectic solvent (DES) has been successfully synthesized that is based on benzyltriethylammonium
bromide as a hydrogen bond acceptor (HBA) and urea as a hydrogen bond donor (HBD).
However, its usability in modifying cellulose derivatives, especially acylating hydroxyethylcellulose (HEC) was
investigated. The chemical modif...
The main objective of the present work is to elaborate on a new eco-friendly and efficient adsorbent designated for aquatic micropollutants removal. However, the synthesis of the Ethylenediamine Crosslinked 2D-Cellulose green adsorbent was carried out successfully, by partial grafting of benzyl entities onto hydroxyl groups of HEC, and crosslinking...
In this paper, a new green pH-sensitive cellulose based hydrogel (swelling rate ~ 1005 %) was successfully elaborated. However, the new EDTA crosslinked HEC was investigated as adsorbent materiel, which it showed high removal efficiency (~2000 mg.g ⁻¹ ) to aquatic micropollutants, especially methylene blue as cationic dyes model. The synthesis of H...
Zn-doped tungsten bronze compounds derived from Ba5CaTi2Nb8O30, with Ba5CaTi2-xZnxNb8O30 composition (x=0; 0.04 and 0.08) were synthesized by the conventional solid-state reaction route. Both solubility of Zn in Ba5CaTi2Nb8O30 and tungsten bronze formation with the P4bm space group were verified by the Rietveld method using X-ray diffraction data....
In this study, the removal of Pb(II), Cu(II), Cd(II), and Zn(II) ions from aqueous solutions was investigated using succinic anhydride modified cellulose monoacetate. In the first part, the cellulose acetate was successfully succinylated in a homogenous medium of DMF using 4-dimethylaminopyridine (DMAP) as a catalyst. The obtained material (AcS) wa...
In the present work, we have studied the effect of Gd-substitution on the structural, dielectric and electrical properties of Sr2Sm1−xGdxTi2Nb3O15 (x = 0 and 0.5) tungsten bronze ceramics prepared by a high-temperature solid-state reaction technique. The formation of the phase of tetragonal tungsten bronze was verified by the Rietveld refinement us...
Ba5CaTi2−xZnxNb8O30 ceramics (x = 0, 0.04, and 0.08) were synthesized by a conventional solid-state reaction method at 1300 °C for 6 hours. The effects of the Ti/Zn ratio on structural and dielectric properties were studied by changing the value of x. The pure phase formation of all prepared Ba5CaTi2−xZnxNb8O30 compositions was confirmed by X-ray d...
Ba5CaTi2−xZnxNb8O30 ceramics (x = 0, 0.04, and 0.08) were synthesized by a conventional solid-state reaction method at 1300 °C for 6 hours. The effects of the Ti/Zn ratio on structural and dielectric properties were studied by changing the value of x. The pure phase formation of all prepared Ba5CaTi2−x- ZnxNb8O30 compositions was confirmed by X-ray...
The uncontrolled radical grafting of acrylamide on cellulose generates a disorderly size distribution of grafted and ungrafted (as a by-product) PAM chains, which required additional purification steps. At this stage, the anionic grafting appears as a well-controlled grafting method of acrylic entities on the cellulosic backbone, using alkali alkox...
In this work, Zn co-doped tungsten bronze having nominal formula Ba5CaTi1.94Zn0.06Nb8O30 has been synthesized and systematically studied for structure, dielectric and electrical properties. The formation of the phase of tetragonal tungsten bronze with space group P4bm and the occurrence of oxygen vacancies were verified by the Rietveld refinement u...
The present investigation deals with the elaboration in homogenous conditions of new cross-linked, hydroxyl cellulose (HEC) based material. Further, its application as a new eco-friendly low-cost efficient adsorbent of hazardous metal ions from an aquatic environment is treated. In this respect, the functionalization of HEC has been carried out usi...
In this study, tungsten-bronze type materials of Sr 2 Sm (1-x) Nd x Ti 2 Nb 3 O 15 composition (x=0; 0,25; 0,5; 0,75 and 1) were elaborated by classical solid-state reaction. The structural characterization demonstrate that these compounds present tetragonal symmetry, using two space groups P4bm (N°100) and P4/mbm (N°127) respectively. The lattice...
Ba5CaTi2−xZnxNb8O30 ceramics (x = 0, 0.04, and 0.08) were synthesized by a conventional solid-state reaction method at 1300 °C for 6 hours. The effects of the Ti/Zn ratio on structural and dielectric properties were studied by changing the value of x. The pure phase formation of all prepared Ba5CaTi2−x- ZnxNb8O30 compositions was confirmed by X-ray...
The present work consists; firstly, to describe the preparation and characterization of new cellulose based chelating materials in homogeneous conditions. On the other hand, the study of the extraction of heavy metals by the new elaborated chelating materials was realized. The cellulose acetate (Ac) with degree of substitution of 1.16 prepared in p...
New water-soluble cellulosic derivative based on HEC was successfully elaborated (HECc), and used as anionic coagulant-flocculant of colloidal systems Fe(OH)3 and to remove of heavy metal ions (Cu(II)) from aqueous media. HECc was synthesized in unconventional reverse microemulsion process using water as ecofriendly solvent and as hydrogen transfer...
The partial hydrophobization of hydroxyl ethyl cellulose (HEC), by incorporating benzyl entities, was successfully performed. So, cavities with binding sites enable to encapsulate the copper ion (Cu(II)) by coordination interaction result from. The resulting product (BEC, DS ≈ 1) thus contained two types of chelating sites: 2,2′-oxydiethanol and 2,...
Generally, grafting alkylated chains onto cellulose backbone modifies its physicochemical properties strongly, and the variation in the hydrophobicity of the cellulose causes significant modifications of these superficial characteristics. In this sense, this study highlighted the effect of the hydrophobicity-hydrophilic balance brought by the level...
In this paper, new quaternized cellulose derivative based on Ethylenediaminetetraacetic acid (EDTA) and hydroxyethyl cellulose (HEC) is successfully prepared in homogeneous medium. The resulted product is characterized using spectroscopy techniques (FTIR, 1H NMR and 13C NMR). At the supramolecular level, the x-ray patterns show that a high hydrogen...
In the last few years, science and technology have made remarkable discoveries in the field of bio-renewable materials. In this context, polysaccharide based biopolymers present themselves as a high potential source of innovation. Due to its availability and biodegradability, Cellulose, the polymer belonging to the polysaccharide family, has a grea...
In this paper, we exploited the strong relation between the degree of substitution (DS) of the cellulosic derivatives and their physicochemical behavior, in particular the solubility. Thus, it is smart to change the problem of finding new and complex solvent system by an understanding the effect of cellulose acetate DS on the solubility process and...
Cellulosic fibers, a renewable raw material, can be successfully modified with functionalized compounds yielding hydrophilic or hydrophobic and biodegradable substrates. Thus, the judicious choice of the polar/nonpolar balance, as well as, the length of the macromolecular segments of the coupling agent gave rise to a variety of interesting modified...
In this work we have synthesized Li (Ni 1/3 Co 1/3 Mn 1/3) O 2 using sulfates metals Ni, Co and Mn and LiCl salt. The used method is easy and led to yield higher than 75%. Identification and lamellar α-type NaFeO 2 of the composite synthesized were demonstrated by X-ray diffraction and FTIR spectroscopy. We demonstrated that the product is pure and...
In this study, we described the biodegradation process of cellulose based on the Boltzmann distribution derived from autocatalytic kinetics. From the autocatalytic model (MAC) we concluded that the molecular weight, temperature, and the interaction parameter (í µí±¥) (type of polymer and biodegrading agent) are the major factors governing the pheno...
Electroceramics XV, Limoges, France.
Attempts to modify the surface of hydroxyethyl cellulose acetate (HECA-DSAC ~1.5) microfibrils were made using amine terminated molecules. First, the amine compounds were reacted with sebacoyl chloride in nonstoichiometry ratio in order to obtain a monoadduct chloride such as ClCO-(CH2)8)-CONHR. Then the
resulted derivatives were coupled with hydro...
13ème Congrès International de la Céramique (ECerS XIII)
The study of the Ba/La order in the Ba 6-x-y La 8+2/3x+y Ti 18-y Al y O 54 solid-solution was performed by X-ray diffraction on powders and single-crystals. The crystal structure of these phases belongs to the tetragonal tungsten bronze type, build on the basis of (3x3) TiO 6 octahedron more than (2X2) (space group Pnma, a≈22.4Å , b≈7.7Å , c≈12.2Å)...
The study of the Ba/La order in the Ba6-x-yLa8+2/3x+y Ti18-y Aly O54 solid-solution was performed by X-ray diffraction on single-crystals. The crystal structure of these phases belongs to the tetragonal tungsten bronze type, build on the basis of (3x3) TiO6 octahedron more than (2X2) (space group Pnma, a≈22.4Å, b≈7.7 Å, c≈12.2 Å). The substitution...
A study of the Ba/La/Sr ordering in the (Ba1–αSrα)6–xLa8+2x/3Ti18O54 (0⩽x⩽3) solid solutions was carried out by X-ray diffractometry and dielectric measurements. The maximum of substitution is obtained for x=0 and α =0.33, i.e. for Ba4Sr2La8Ti18O54 composition. The crystal structure is closely related to the tungsten–bronze-type structure with 3×3...
A study of the Ba/La/Sr ordering in the (Ba1–αSrα)6–xLa8+2x/3Ti18O54 (0⩽x⩽3) solid solutions was carried out by X-ray diffractometry and dielectric measurements. The maximum of substitution is obtained for x=0 and α =0.33, i.e. for Ba4Sr2La8Ti18O54 composition. The crystal structure is closely related to the tungsten–bronze-type structure with 3×3...
