2024-03-29T09:06:59Z
https://ejchem.journals.ekb.eg/?_action=export&rf=summon&issue=462
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2017
60
1
Preparation, Characterization and Antimicrobial Activities of N'-((3-(hydroxyimino) butan-2-ylidene)-2 (phenylamino) acetohydrazide and Its Metal Complexes
Mohammed
Wahba
Fathy
El-Saied
Ahmed
Al-Hakimi
Mohammed
Shakdofa
A series of fourteen metal complexes synthesized by reaction a new acetohydrazide oxime ligand with metal ions (CuII, NiII, CoII, MnII, FeIII, ZnII, RuIII, UO2VI and VO2VI). The Ligand, N''-((3-(hydroxyimino)butan-2-ylidene)-2-(phenylamino)acetohydrazide was prepared by refluxing equimolar amount of phenyl amino acetohydrazide with 2,3-butanedione monoxime. The synthesized compounds were characterized using elemental and thermal analyses, NMR, IR, U.V spectroscopy, magnetic and conductance measurements. The results demonstrated that complexes (2), (3), (5-7) and (10-12) were formed in 1L:1M molar ratio, while complexes (4), (8), (9), (13) and (14) were found to afford M2L formulae. The ligand acted either as a neutral bidentate, neutral, monobasic or dibasic tridentate and dibasic tetradentate ligand chelated to the metal ions via nitrogen atoms of aceto-amino and azomethine groups, carbonyl oxygen atom in its enolic or ketonic form and/or protonated or deprotonated oximino nitrogen atom, adopting aoctahedral, tetrahedral or square planar geometry around metal ions. The antimicrobial activity of the ligand as well as the metal complexes was examined using Amphotericin B and Amoxicillin as drug-standards against Aspergillum niger (A.niger) and Escherichia coli (E. coli) respectively. The ligand demonstrates a high cytotoxicity against A. niger whereas it recorded a moderate activity against E. coli. It is interestingly found that zinc(II) complex (6), copper(II) complexes (8, 10) recorded higher activities than the Amphotericin B drug with 122%, 116% and 111.1% percentages respectively against A. niger zinc(II) complex (6) was also the most sensitive complex against E. coli with (94.1 %) comparable to Amoxicillin.
acetohydrazide
Oxime
Metal complexes
2
3-Butanedione monoxime
Antimicrobial
2017
02
01
1
24
https://ejchem.journals.ekb.eg/article_1527_f541c94732c8b033ecf1b32c609d75a6.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2017
60
1
Preparation and Spectroscopic Studies of Some Copper and Nickel Schiff Base Complexes and their Applications as Colouring Pigments in Protective Paints Industry
Osama
Wahba
Ali
Hassan
Abdelrahman
Naser
Adel
Hanafi
New copper (II), nickel (II) Schiff base complexes derived from 3,3 Dimethoxy anizidine and selected aldehydes, namely 2,4 dihydroxybenzaldehyde with the metal salts have been synthesized using a simple technique of microwave method (Green chemistry). The physical properties of prepared ligand and its metal complexes were recorded. The ligand and complexes were characterized using elemental analysis, NMR, infrared and also their geometrical structure were investigated using spectral UV–Vis reflectance, magnetic susceptibility, electron spin resonance (ESR), thermal gravimetric analysis (TGA) and scan electron microscope (SEM). The performance tests (oil absorption, fineness of grind, moisture content, pH and bleeding test in different solvents) of the solid metal complexes were explored to ensure that the complexes can be used as a pigments in the field of anti-corrosive paints without any compatibility problems in the paint’s vehicle. The anti-corrosive paints were formulated based on the prepared metal complexs as a pigments and the Physical, mechanical, color properties and corrosion resistance of dry paint films were also examined. The obtained results revealed that the prepared metal complex pigments showed excellent mechanical, corrosion resistance with color stability and don’t effect or react with the other components in the anti-corrosive paint formula.
Transition metal complexes
Schiff bases
Pigments, paints
Corrosion Resistance
2017
02
01
25
40
https://ejchem.journals.ekb.eg/article_1518_724d577ac6d17aa6366b5acf4bfb61aa.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2017
60
1
Kinetic Study of Gelatin/Chitosan Based Nanocomposites for Acid Red 150 Dye Adsorption Using Ultrasonic Energy
Ahmed
Haroun
Hamada
Mashaly
Hany
Helmy
Mona
Kamel
Adsorption studies using ultrasonic energy of acid red 150 of fluid liquor as for starting dyestuff concentration, temperature, dyeing time, pH, and sorbent amount had studied. Langmuir adsorption type was undertaken for depicting isotherms stability. The adsorbent suitability was examined by matching the adsorption information with Langmuir isotherm. The outcomes demonstrated that increasing of AR150 adsorption raised the concentration of both dyestuff and chitosan. A comparison between adsorption kinetics of four composites using AR150 with traditional and ultrasonic methods had been made. The time/dyestuff-uptake isotherms were declaring the improvement of dyestuff-uptake in adsorption second phase. Adsorption rate amounts, reaction half-time and standard affinity were studied and explained. The results explained that dyestuff uptake amounts for adsorbed composites using ultrasound technique are lower than those got in case of the conventional one. The isotherms showed lower dyestuff uptake of acid dyestuff red150 using ultrasonic technique relative to that in case of conventional one.
dye removal
Ultrasonic
acid red150 dye
Kinetic adsorption isotherm
2017
02
01
41
54
https://ejchem.journals.ekb.eg/article_1564_3361f8aaaf3a097b98347c8f525b4e80.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2017
60
1
Evaluation The Combustion Properties of The Modified Polypropylene
Ahmed
A. Younis
A new flame-retardant compounds A; synthesized from phenyltrimethoxysilane (PTMS) and potassium-montmorillonite (K-MMT), B; synthesized from 3-glycidoxypropyl)trimethoxysilane (3-GPTMS) and potassium-montmorillonite (K-MMT), and C; synthesized from potassium-montmorillonite (K-MMT) that prepared by using sol-gel technique. TWIN-SCREW EXTRUDER was used to blend polypropylene (PP) with different weight percentage of polymers A, B, and C. In this paper the thermal properties of composites A, B, and C were examined by using differential scanning calorimeter (DSC). The combustion properties of the composites PP/A, PP/B, and PP/C were evaluated by the cone calorimeter (CC) at heat flux 35kW/m2. The decreasing Mass Loss Rate, Heat Release Rate (HRR), and Peak Heat Release Rate (pHRR) of the blend specimens compared to the pure PP (blank) after combustion indicated the main role of the blend composites in improving the ignition properties of the PP. Hence, the fire risk of the PP can be ignored with blending with composites A, B, and C.
flame retardant
polypropylene
Cone calorimeter
heat release rate
differential scanning calorimeter
2017
02
28
55
67
https://ejchem.journals.ekb.eg/article_1524_16c9951c632b77e5e74d9d328f85082c.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2017
60
1
Effect of Phenolic Compounds and Water Repellents Combination on Performance Properties of Cotton/ polyester Blended Fabric
Hesham
Fahmy
Amal
Aly
Ahmed
Amr
Shimaa
Sayed
Mohamed
Rabie
A newly prepared stearyl alcohol / poly (N-vinyl-2-pyrrolidone) (SA/PVP) hybrid emulsion was incorporated, as a water repellent finish, alone or in combination with some phenolic compounds namely tertiary butyl hydroquinone (TBHQ), curcumin and vanillin, in different easy care finishing formulations. The results obtained reveals that: i) treating fabric samples with different concentrations of the hybrid emulsion in absence of the aforementioned phenolic compounds, significantly enhances fabric weight, tensile strength, stiffness, water repellency, antibacterial properties, water vapor resistance and thermal resistance along with a gradual decrease in the resilience, surface roughness and air permeability of treated fabric, ii) combining the hybrid emulsion with the above phenolic compounds efficiently enhances the storage life of the emulsion and upgrades the antibacterial properties of treated fabric, iii) meanwhile, vanillin provides the finished fabric with pleasant scent, curcumin upgrades the UV protection properties of treated fabric and TBHQ slightly enhances tensile strength, surface roughness, air permeability, water vapor resistance and thermal resistance along with a reduction in the resilience of treated fabric, and iv) the prepared hybrid emulsion, whether in absence or presence of TBHQ, can be used as extender for fluorocarbon textile finishes.
Phenolic compounds
water repellency
textile finishing
antibacterial properties
UV protection
2017
02
28
69
84
https://ejchem.journals.ekb.eg/article_1599_746ffcb67d47e09df657c5ad6091fa67.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2017
60
1
Alternative Fuels for Diesel Engines Using Highly Saturated and Highly Unsaturated Vegetable Oils
Ferial
Zaher
Omayma
El-Kinawy
Hanaa
Soliman
Adel
Abdel-Razek
The quality of fatty acid methyl esters of linseed oil; a highly unsaturated oil, as a biodiesel fuel, was compared to that prepared using palm oil; a highly saturated vegetable oil. The comparison included the fuel properties such as the calorific value, flash point, carbon residue%, ash%, pour point, cetane index, viscosity, ASTM distillation characteristics and oxidative stability. The performance of a diesel engine running using 50% blend of each with regular diesel has been also assessed at different engine loadings and compared to that using regular diesel fuel. The parameters considered in this assessment were the brake specific fuel consumption, the brake thermal efficiency, and the composition of the combustion exhaust The results have shown that biodiesel produced by trans-esterification of linseed oil have two advantages over that produced by trans-esterification of palm oil being more volatile with higher heating value. However, the flash point of linseed biodiesel was lower than that of palm oil biodiesel which makes it less safe during handling and storage. Moreover, linseed biodiesel was much less stable to oxidation than palm oil biodiesel whereby the induction period measured by Rancimat test was 40.6 hours in case of palm biodiesel compared to 2.8 hours in case of linseed. The effect of biodiesel unsaturation on diesel engine performance in terms of fuel consumption rate and brake thermal efficiency was insignificant.
Biodiesel
unsaturation
linseed oil
palm oil
oxidative stability
2017
02
28
85
94
https://ejchem.journals.ekb.eg/article_1654_72a75b2c1b46120d8834d91d3890d91e.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2017
60
1
Application of Theophylline Anhydrous as Inhibitor of Acid Corrosion of Aluminum
Nader
Ismail
Helmy
Megahed
Asmaa
Ali
Mona
Eletre
The inhibitive effect of theophylline anhydrous on aluminum corrosion in hydrochloric acid solution was investigated using chemical and electrochemical techniques. It was found that the compound acts as good corrosion inhibitor with inhibition efficiency more than 99.9%. The inhibition efficiency was found to increase with inhibitor concentration and exposure time. On the other hand it decreases by rising the temperature. The inhibition action was discussed in view of adsorption of the organic compound molecules on the aluminum surface. It was found that the adsorption of theophylline anhydrous on aluminum surface follows Langmuir adsorption isotherm. The thermodynamic parameters for the corrosion process in free and inhibited media were calculated and interpreted.Corrosion of metals and alloys is a disaster which causes a large economic loss in different human activitiesThe corrosion process is thermodynamically spontaneous and cannot be totally stopped anyhow. However, there are continuous trials to develop methods for decreasing the corrosion to its minimum rate
Theophylline
Aluminum
Corrosion inhibitor
electrochemical techniques
Thermodynamic parameters
2017
02
28
95
107
https://ejchem.journals.ekb.eg/article_1565_cd63def7dab0b089750149ad33e10e23.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2017
60
1
Study the Ultrasonic Assisted for Polymeric Nanocomposite
Wael
Mohamed
Hanaa
Nasr
Rokaya
Sobh
Ahmed
Eid
Ultrasonic transmission is a clean, non-damaging technique for characterization of polymer emulsions and dispersion systems. Propagation of ultrasonic wave was examined utilizing pulse – echo method using 2 MHz frequency and temperature 300oK. Polymeric nanocomposites using different monomer composition of methyl methacrylate (MMA) & butylacrylate (BuA) monomers in presence of different concentrations of titanium dioxide (TiO2) nanoparticles via emulsion polymerization technique using ultrasonic waves as initiation systems for different time intervals were prepared and characterized by (TGA), X-ray analysis and particle size analysis using transmission electron microscope (TEM). The obtained results showed that the particles of the prepared nanocomposite samples in the nano-sized diameter ranged between 46.5 – 71.5 nm. The ultrasonic velocity, density and viscosity of the prepared nanocomposite samples were measured at various concentrations. From the data, ultrasonic factors such as ultrasonic attenuation (α) , adiabatic compressibility (β), acoustic impedance (Z), and stiffness constant (c) have been predestined by standard relations. These results are interpreted in terms of molecular interaction between the components of the mixture. The variation of β, Z, τ, α and c with concentration have been studied. The results have been compared with those obtained from various theories and the results are analyzed and interpreted in terms of molecular interactions.
MMA
BuA
Titanium dioxide
Ultrasonic
Nanocomposite
2017
02
28
109
128
https://ejchem.journals.ekb.eg/article_1582_5ebae16016ca45832f75b170f403697c.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2017
60
1
Synthesis and Applications of Pyridazinones for Base oil Improvement
Maher
nessim
Three Pyridazinone derivatives of the type 4,5-dihydropyridazin-3(2H)-ones, N-(4-(6-oxo-5-((5-phenyl-1,3,4-thiadiazol-2-yl)amino)-1,4,5,6-tetrahydropyridazin-3-yl)phenyl) acetamide (4a), 6-(4-Chlorophenyl)-4-((5-phenyl-1,3,4-thiadiazol-2-yl)amino)-4,5-di-hydropyridazin-3(2H)-one (4b) and 6-(4-Bromophenyl)-4-((5-phenyl-1,3,4-thiadiazol-2-yl)amino)-4,5-dihydropyridazin-3(2H)-one (4c) were synthesized. They were characterized by the conventional tools of analysis, Elemental analysis, IR and 1H-NMR spectroscopy. The tools of analysis confirmed the structure of the three prepared compounds. These heterocyclic compounds are chemically stable and possess multi actions for base oil improvement. They are tested as antioxidants for local base oil through the change in total acid number (TAN). They gave good results as antioxidants base oil. Also these three synthesized compounds are tested as corrosion inhibitors for carbon steel in acid medium. The efficiency order for these tested compounds is ranked as follows: 4a > 4b > 4c. Energy of the highest occupied molecular orbital (EHOMO) and lowest unoccupied molecular orbital (ELUMO) for the three prepared compounds were calculated via the Ab initio method. Studying of the quantum chemical calculations of the synthesized compounds showed good matching with the experimental results.
Keywords: Pyridazinones
imidazole
thiadiazole
antioxidant
anticorrosion
Quantum chemical calculations
2017
02
28
129
147
https://ejchem.journals.ekb.eg/article_1916_95c0d7053b455d8909f9564d3aaf374f.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2017
60
1
Production of Petroleum – like Fractions from Waste Cooking Oil
HYDROCRACKING technique was applied here for producing ……petroleum- like fractions from waste frying oil. The experiments were performed in a fixed bed flow reactor system, under high pressure using zeolite catalyst. The operating conditions were optimized and found to be 400oC, 2.5 MPa hydrogen pressure and 5 h-1 LHSV. The obtained biofuel was fractionated to gasoline, kerosene and gas oil- like fractions. All the required analyses were accomplished and the data were evaluated. The results indicate that the properties of the attained products are completely compatible with those of the corresponding distillates ensued from petroleum source.
biofuel
Hydrocracking
Waste Cooking Oil
2017
02
28
147
160
https://ejchem.journals.ekb.eg/article_2349_83d84eaac3e07dbd3a3d90f0b2cbae77.pdf