A. Chahine

• Professor at Ibn Tofaïl University

The corrosion of metals in acidic environments remains a significant challenge, driving the search for sustainable and eco-friendly inhibitors derived from natural sources. This study evaluates the corrosion inhibition potential of three extracts from Cannabis sativa L., namely ethanol extract (EET), hexane extract (EHX), and dichloromethane extrac...

Cannabis is considered (Cannabis sativa L.) a sacred herb in many countries and is vastly employed in traditional medicine to remedy numerous diseases, such as diabetes. This research investigates the chemical composition of the aqueous extracts from Cannabis sativa L. seeds. Furthermore, the impact of these extracts on pancreatic α-amylase and lip...

Within the framework of the valorization of cannabis seeds harvested in Ketama located in the region of Tangier-Tetouan-Al Hoceima, Morocco, a phytochemical study was carried out. The hexane extract of cannabis seeds was prepared and analyzed by gas chromatography-mass spectroscopy (GC–MS). The study proved that the natural extracts of Cannabis Sat...

In this work, a new generation of corrosion inhibitors composed of xMCl2-yNa4P2O7 (MCl2 = 2,2’-dibenzimidazolyl butane dichlorhydrates) hybrids materials have been synthesized successfully with five molar ratios (R1, R2, R3, R4, and R5) by soft chemistry route and characterized. The synthesis was performed in aqueous solutions by the ionic exchange...

The aim of the present paper is to develop of a new sol–gel synthesis route for production of phosphate-based glasses in TiO2-NiO-P2O5 systems. The structure of the prepared glasses was investigated by ICP-AES, density methods, FTIR and RAMAN spectroscopy, XRD, ³¹P MAS-NMR and DSC, that confirmed successful synthesis and production of phosphate-bas...

Novel film catalysts of the polystyrene (Ps) and trimethyl phosphate (P) nanoparticles were synthesized on glass substrates by soft chemistry using doctor blade method. Subsequently, the prepared Ps–P film catalysts were characterized by various techniques, including fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance (NMR),...

In this work, we have developed a simple and very effective experimental strategy for the reaction of Knoevenagel via the condensation of aromatic aldehydes substituted with active methylene compounds in the presence of hybrid nanocomposites xMCl2-yNaPO3 (MCl2 = 2,2′-dibenzimidazolyl butane dichlorhydrates), under ecological conditions. The Phospha...

New phosphorus–titanium–nickel composites were deposited on steel substrate by using sol gel spin coating technique for application as anticorrosion coatings. Along with the synthesis, the effects of annealing temperature and various number of coating layers on anticorrosion properties were looked into. The corrosion behavior of deposited and annea...

In this work, novel organic–inorganic hybrid nanocomposites M⁺/PO3⁻ (M = 2,2′-dibenzimidazolyl butane) were prepared by soft chemistry method. The synthesis was done by ion exchange method between sodium metaphosphate anions (yNaPO3) and 2,2′-dibenzimidazolyl butane dichlorhydrates cations (xMCl2) in aqueous media. The MCl2 organic salt and the M⁺/...

This work aims at synthesis and characterization of 2,2[Formula: see text]-dibenzimidazolyl butane as an effective corrosion inhibitor of mild steel in sulfuric acid solution. A simple and efficient method for its synthesis in described. The chemical structure and surface morphology of 2,2[Formula: see text]-dibenzimidazolyl butane were characteriz...

p>Photocatalytic activity of (50-x/2)Na₂O-xTiO₂–(50-x/)P₂O₅ glasses (0 ≤ x ≤ 10 mol%) has been studied with an increase in the TiO₂ content using UV-Visible spectrophotometry. Thermal properties were carried out from DTA measurement, and the variation of glass structure was investigated by Four...

p>We have synthesized by the hydrophobic effect a new hybrid polymer material (HP) composed of segments of different solubility: polystyrene (hydrophobic) and sodium metaphosphate (hydrophilic). The structure and thermal stability of these hybrid materials were investigated and compared to the starting materials using X-ray diffraction (XRD) <sup>3...

Structure and physical properties of 25CaO–xPbO–(75–x)P2O5 (0≤x≤35) glasses are investigated in this paper. Substitution of PbO for P2O5 in the binary 25CaO–75P2O5 glass was found to increase the density and to decrease the molar volume. Fourier transform infrared (FTIR) and Raman spectroscopies show the evolution of the phosphate skeleton when the...

Ternary phosphate glasses of the system (ZnO)(0.45 − x)–(P2O5)(0.55 − y)–(V2O5)z, (y = 0; x = z = 0.01, 0.1; 0.2) and (x = 0, y = z = 0.1; 0.2) are prepared via the sol–gel process using zinc acetate, ammonium metavanadate and phosphoric acid as precursors. Spectroscopic investigations reveal a phosphate glass system depolymerization by systematic...

Barium vanadophosphate glasses, having composition 50BaO–xV2O5–(50 − x)P2O5, (x = 0–50 mol%), were prepared by conventional melt quench method. Density, molar volume and glass transition temperature (Tg) were measured as a function of V2O5 content. Structural investigation was done using XPS and FTIR spectroscopy. First, substitution of the P2O5 by...

(50-x)CaO-xPbO-50P 2O 5 glasses (0 ≤ x ≤ 50) were synthesized by quenching technique. They have been characterised by Fourier transform infrared (FT-IR) and Raman spectroscopies. FT-IR and Raman spectral investigations reveal the formation of P-O-Pb bonds which replace P-O-Ca bonds and show that no metaphosphate network depolymerisation occurs when...

Vanadium doped cadmium phosphate glasses xV2O5–(50−x)CdO–50P2O5 with 0≤x≤20mol% were prepared and FTIR, Raman, EPR and optical absorption measured. Infrared and Raman investigations show the formation of P–O–V and V–O–V bonds, which replace P–O–P ones. The simulations of EPR spectra of most glass samples 2.5≤x≤10mol% reveal a superposition of two r...

Physical properties and structure were investigated for xCdO-(50-x/2)V₂O₅-(50-x/2)P₂O₅ (0=x=50) glasses. Substitution of CdO for V₂O₅ and P₂O₅ in the binary 50V₂O₅-50P₂O₅ glass increases the density and decreases the m...

xV2O5-(50-x)CdO-50P2O 5 (0 ≤ x ≤ 50 mol%) glasses were prepared and investigated using DSC, IR spectroscopy and Raman spectroscopy. For low concentrations of V2O5 (x ≤ 20 mol %), the formation of P-O-V bonds increases the crosslink strength of the glass network and leads to increased Tg. For x > 20 mol%, the infrared and Raman spectra show that the...

(50−x/2)Na2O–xCuO–(50−x/2)P2O5 glasses (x=1, 5, 15, or 30 mol%) have been prepared and characterized by electron paramagnetic resonance (EPR) and magnetic susceptibility measurements. The shape of the Cu EPR spectrum depends on the Cu content, and the corresponding computer simulations suggest that the Cu ions occupy two different sites in these gl...

The structure and properties were investigated for (50−y)Na2O–yCuO–10Bi2O3–40P2O5 (0≤y≤25 mol%) glasses. Substitution of Bi2O3 for Na2O in the binary 60Na2O–40P2O5 glass decreases the molar volume (ΔVm=2.97 cm3/mol) and increases further the glass transition temperature (ΔTg=52 °C). FTIR and Raman spectra reveal the formation of POBi and POCu b...

(50−x/2)Na2OxCuO(50−x/2)P2O5 glasses (5≤x≤33.33) have been synthesized and investigated by Fourier transform infrared (FT-IR) and Raman spectroscopies. FT-IR and Raman spectral investigations reveal the formation of POCu bonds and show the evolution of the phosphate skeleton: (PO3)∞ chains for NaPO3 to P2O74− groups in the richest CuO glass. Th...

Conditions of glass formation in the Na2O-Bi2O 3-CuO-P2O5 system are reported. Their physical, thermal and spectroscopic properties such as density, molar volume, glass transition temperature, infrared spectra and Raman spectra have been investigated. The large increase in Tg (ΔTg= 68°C) and the large decrease in molar volume (ΔVm=7.1 cm3/mol), whe...

Glasses with composition 50Na2O-xCuO-(50-x)P2O5 (0 ≤ x ≤ 15) were prepared and studied by density and molar volume measurements, thermal analysis and infrared spectroscopy. Infrared results indicated that CuO is incorporated in the network through P-O-Cu bonds and behaves as a network former in these glasses. In the considered composition range, py...

Glasses with composition 50Na(2)O-xCuO-(50-x)P2O5 (0 less than or equal to x less than or equal to 15) were prepared and studied by density and molar volume measurements, thermal analysis and infrared spectroscopy. Infrared results indicated that CuO is incorporated in the network through P-O-Cu bonds and behaves as a network former in these glasse...

(50−x)Na2O–xCuO–10Bi2O3–40P2O5 glasses (0≤x≤25) were prepared by melting at 900–1100°C mixtures of Na2CO3, Bi2O3, CuO and (NH4)2HPO4. DSC measurements give the variation of glass transition temperature Tg from 318 (x=0) to 378°C (x=25). FTIR spectroscopy shows the evolution of the phosphate skeleton: (PO3)∞ chains for 60Na2O–40P2O5 to P2O7 groups i...

(40−x)Na2O-xCuO-10Bi2O3-50P2O5 glasses (0 h x h 40) were prepared and studied. Their density, molar volume, glass transition temperature and IR spectroscopy have been investigated in order to understand the structural role of Bi2O3 and CuO in these glasses. In the sodium bismo-phosphate glass, the structures consist of some phosphate chains linked...

(50−x)Na2O–xCuO–10Bi2O3–40P2O5 glasses (0≤x≤25) were prepared by melting at 900–1100°C mixtures of Na2CO3, Bi2O3, CuO and (NH4)2HPO4. DSC measurements give the variation of glass transition temperature Tg from 318 (x=0) to 378°C (x=25). FTIR spectroscopy shows the evolution of the phosphate skeleton: (PO3)∞ chains for 60Na2O–40P2O5 to P2O7 groups i...