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- Chemistry (19)
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- 3':4 (1)
- 3-b]pyridine (1)
- 3-d]pyrimidine (1)
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- 4-c]chromenes (1)
- 4-c]pyridines (1)
- 5] pyrano[2 (1)
- 5]pyrano[2 (1)
- ; WADI AN NATRUN; Egypt (1)
- Acrylic fabrics; Reactive dye; N-methylol compound and fastness properties; FTIR; tensile strength and elongation % (1)
- Aluminum; Aluminum alloys; Corrosion; inhibition; Polarization (1)
- Amaranth; Photoelectrocatalytic; Decolorization; Degradation (1)
- Antifungal agents; Plant extracts; human pathogenic fungi (1)
- Antimicrobial activity (1)
- Basalt; Clinkerization; Ordinary Portland Clinker (1)
- Chemical Reduction; silver nanoparticles; X-ray diffraction (XRD) (1)
- Chromenes; Michael reaction; pyrano[3 (1)
- Chromeno [4' (1)
- Chromeno[3 (1)
- Chromeno[4' (1)
- EGYPT (1)
- HALOTHERMOPHILIC BACTERIUM; HALOMONAS CASEINILYTICA WN.1B.S (1)
- Jojoba oil; Castor oil; sulfurization; biogrease (1)
- LPS; Ameliorative; Melatonin; kidney; Liver; Blood (1)
- Menthol; analgesic; anti inflammatory; Reversed phase; refractive index; HPLC; drug analysis (1)
- Methyl salicylate; Camphor (1)
- Multifunctional acrylate monomers; Gallic acid; diethanolamine; precipitation polymerization; Azobisisobutyro-nitrile; and Differential scanning calorimetry (1)
- Nanopolymer; Polyaniline; polymer-modified asphalt; anticorrosive coating (1)
- Nepeta septemcrenata; Saint Katherine Protectorate; altitudinal variation (1)
Articles 1 - 26 of 26
Full-Text Articles in Life Sciences
Validated Stability Indicated Rp-Hplc Method For Simultaneous Determination Of Methyl Salicylate, Camphor And Menthol In Cream Preparations, I. Abd Ellah, M. Elnawawy, A. Elewa
Validated Stability Indicated Rp-Hplc Method For Simultaneous Determination Of Methyl Salicylate, Camphor And Menthol In Cream Preparations, I. Abd Ellah, M. Elnawawy, A. Elewa
Al-Azhar Bulletin of Science
A method for the determination of three active products in pharmaceutical preparation Rheumatizen topical cream was described. The method was based on isocratic elution of Methyl Salicylate, Camphor and Menthol on reversed phase column C8 Thermo hyperseal 250mm x 4.6mm 5µm - using a mobile phase consisting of mixture of 45% Acetonitrile: 55% (Water+0.2% Triethyl amine adjusted to pH 5 with acetic acid)at a flow rate of 1 ml/min. Quantization was achieved with Refractive index (RI) detector. Linearity of Methyl Salicylate, Camphor and Menthol was found to be from (2.4 mg/ml to 9.6 mg/ml), (0.32 mg/ml to 1.28 mg/ml) and …
Reviewon Recent Applications Of Antimicrobial Agents For Polyamide And Polypropylene, A. Ramadan, S. Gawish
Reviewon Recent Applications Of Antimicrobial Agents For Polyamide And Polypropylene, A. Ramadan, S. Gawish
Al-Azhar Bulletin of Science
The growth of microbes on textiles during use and storage, will affects the wearer as well as the textile itself. The detrimental effects can be controlled by durable antimicrobial finishing of the textile using broad-spectrum biocides or by incorporating the biocide into synthetic fibers during extrusion. Consumers’ attitude towards hygiene and active lifestyle has created a rapidly increasing market for antimicrobial textiles, which in turn has stimulated intensive research and development. This article is a review based on recent applications of antimicrobial agents to Polyamide (PA) and Polypropylene (PP) fabrics. The requirements for antimicrobial polyamide and polypropylene fibers such as, …
Effect Of Lipopolysaccharide And The Ameliorative Effect Of The Antioxidant Melatonin On Some Physiological Parameters Of Sheep Embryos, Diaa Ahmed, Samir Zaahkouk, El-Yamani El-Zwahry
Effect Of Lipopolysaccharide And The Ameliorative Effect Of The Antioxidant Melatonin On Some Physiological Parameters Of Sheep Embryos, Diaa Ahmed, Samir Zaahkouk, El-Yamani El-Zwahry
Al-Azhar Bulletin of Science
As known, lipopolysaccharide (LPS) is a toxin that is secreted from gram negative bacteria as E. coli which is present in the gut of animals like sheep and it may be transported to the embryo through the blood affect the brain and other organs. Little is known about the effect of LPS on liver and kidney function or hematological parameters. In the present study we found that melatonin treatment improved most of the liver functions that affected by LPS injection and also improve kidney function, although LPS injection was found to lead to a decrease of createnine, urea and uric …
Survey Of Some Plant Extracts Against Certain Human Fungal Pathogens, Al-Sayed Ragab, H. El- Shiekh, Eman El-Taher, Basma Amin
Survey Of Some Plant Extracts Against Certain Human Fungal Pathogens, Al-Sayed Ragab, H. El- Shiekh, Eman El-Taher, Basma Amin
Al-Azhar Bulletin of Science
Antifungal agents (A.f.A.) play an important role in the treatment of human serious diseases. Therefore, A.f.A. from natural sources was preferred than that synthetic compounds. Methanol, methanol: water; (1:1), water, chloroform and benzene extracts of thirty two plant organs; sixteen desert and sixteen cultivated plant organs were assessed against forty six human fungal pathogenic isolates; twelve (yeast), two (yeast like fungi) and thirty two (filamentous fungi).From the five assessed extracts, chloroform extracts exhibit the most significant activity followed by benzene, methanol: water; (1:1) and methanol, while, water extracts exhibited the least activity. Chloroform extracts revealed the highest inhibitory effect against …
Isolation And Characterization Of Novel Extremely Halothermophilic Bacterium, Halomonas Caseinilytica Wn.1b.S, From Wadi An Natrun, Egypt, S. El-Louboudy, M. El-Gamal, H. Mahdy, M. Mohamed
Isolation And Characterization Of Novel Extremely Halothermophilic Bacterium, Halomonas Caseinilytica Wn.1b.S, From Wadi An Natrun, Egypt, S. El-Louboudy, M. El-Gamal, H. Mahdy, M. Mohamed
Al-Azhar Bulletin of Science
The purpose of the present study was to isolate microbial halothermophiles from hyper saline Al- Hamra Lakeat Wadi An Natrun, Egypt. Twenty eight bacterial isolates were obtained and the morphological and physiological properties in addition to enzyme activities were studied. Amongst those isolates, WN.1B.s was selected as the most potent isolate based on growth at high temperature (up to 65oC) and at high salt concentration (up to 34%, near saturation state).A phylogenetic analysis based on 16S rRNA gene sequences indicated that the isolate WN.1B.s had the highest sequence similarity with respect to type strains of Halomonas caseinilytica (97 %), Halomonas …
Synthesis And Characterization Of A Nonionic Surfactant As A Corrosion Inhibitor For Steel In 1.0 M Hcl., S. Soliman, M. Metwally, S. Selim, M. Bedair
Synthesis And Characterization Of A Nonionic Surfactant As A Corrosion Inhibitor For Steel In 1.0 M Hcl., S. Soliman, M. Metwally, S. Selim, M. Bedair
Al-Azhar Bulletin of Science
Synthesis, adsorption and corrosion inhibiting effect of new nonionic surfactant consisting of 3-[(4-Dimethylamino-benzylidene)-amino]-4-hydroxy-benzenesulphonic acid as hydrophobic part and poly ethylene glylcol (poly ethylene oxide) on steel in 1.0 M HCl was investigated using weight loss and potentiodynamic polarization techniques. The experimental findings revealed that this compound inhibited the corrosion reaction in 1.0 M HCl environment. The results indicated that this surfactant was adsorbed on the metal/solution interface. A theoretical study of the adsorption behavior of this compound was carried out in the framework of the semiempirical (SE) and molecular dynamics (MD).
Effect Of Alkali Metal Ions On Different Zeolites For Alkylation Of Cumene, Mohamed Abdalah
Effect Of Alkali Metal Ions On Different Zeolites For Alkylation Of Cumene, Mohamed Abdalah
Al-Azhar Bulletin of Science
The effects of alkali metal treatment on different zeolite catalysts are investigated to better understand the nature of alkali metal species for the selective catalytic alkylation of cumene by ethylene. H-ZSM5, Y and BEA zeolite catalysts with various molar ratios of K, Rb, and Cs are prepared by ion exchange method and calcined at 550 oC in air atmosphere for 2 h. The study was carried out at 300, 350, 400 and 450 °C for reaction times of 2 hours. Cumene conversion was found to increase with all different alkali metal additions and the reaction temperatures. The catalysts are characterized …
The Utility Of Benzoylchromene And 2-Iminochromene-3-Carboxamide Derivatives For The Synthesis Of Pyranochromenes, Chromenopyrano(Pyrimidine)Pyridine, Chromeno(Pyridines)Quinoline And Their Antimicrobial Evaluation, Hamdy Thabet, Ahmed Halawa, Mohamed Elnassag, Ahmed Hassan
The Utility Of Benzoylchromene And 2-Iminochromene-3-Carboxamide Derivatives For The Synthesis Of Pyranochromenes, Chromenopyrano(Pyrimidine)Pyridine, Chromeno(Pyridines)Quinoline And Their Antimicrobial Evaluation, Hamdy Thabet, Ahmed Halawa, Mohamed Elnassag, Ahmed Hassan
Al-Azhar Bulletin of Science
Some new pyrano[3,4-c]chromene derivatives (4,5,9,13,14), bispyrano[3,4-c]chromene derivative (18) were synthesized via Michael addition of different active methylene compounds to benzoylchromenes 1a,b under different reaction conditions. Chromeno[4',3':4,5]pyrano[2,3-d]pyrimidine and Chromeno[4’,3’:4,5]pyrano[2,3-b]pyridine (24,28) derivatives were obtained from the condensation of 4 with formic acid and benzylidene malononitrile respectively. Novel chromeno[3,4-c]pyridine derivatives (34,37,40,43) and chromeno[3,4-c]tetrahydroquinolinedione (47) were obtained via treatment of 2-iminochromene-3-(4-ethoxyphenyl)-carboxamide (31) with acetonitrile derivatives and cyclohexanone respectively. The structures of the titled compounds cited in this article were elucidated by spectroscopic data (IR, 1HNMR and mass spectra). The antimicrobial activities of the synthesized compounds were performed and some of them display significant results.
Synthesis Of Multifunctional Acrylate Monomers (Mfams) And Their Applications, Fahim Nassar, H. Nassar, F. Hai, G. Ahmed
Synthesis Of Multifunctional Acrylate Monomers (Mfams) And Their Applications, Fahim Nassar, H. Nassar, F. Hai, G. Ahmed
Al-Azhar Bulletin of Science
Novel multifunctional acrylate monomers (MFAMs) were synthesized by reaction of acryloyl chloride with 3,4,5-trihydroxybenzoic (Gallic) acid and diethanolamine in the presence of triethylamine as catalyst. The prepared multifunctional acrylate monomers were used as cross-linkers for the synthesis of polyacrylic acid by precipitation polymerization using 2,2'-azobisisobutyronitrile (AIBN) as free radical initiator. Differential scanning calorimetry studies showed that the glass transition temperature behavior is significantly affected by the type and amount of MFAM employed. Viscosity measurements showed that the thickening effect depend upon the cross-linker type and concentration.
Influence Of Topographic Aspect On The Distribution Of Nepeta Septemcrenata In Saint Katherine Protectorate, South Sinai, Egypt., M. Mansour, K. Omar
Influence Of Topographic Aspect On The Distribution Of Nepeta Septemcrenata In Saint Katherine Protectorate, South Sinai, Egypt., M. Mansour, K. Omar
Al-Azhar Bulletin of Science
A study was carried out on a wild herb Nepeta septemcrenata Benth. (Family: Lamiaceae) in Saint Katherine Protectorate, South Sinai, Egypt to assess the effect of topographic aspect on plant distribution, morphological parameters and soil component. The results show that aspect influence on physical and chemical properties of soil. Water content showed great variation among different aspect directions. Plant traits also affected by these directions. Results found that 26.8% of N.septemcrenata populations’ recorded at North aspect and no observation for Nepeta at South aspect. Soil physical properties showed significant variation among different aspect ranks. Results also showed positive correlation between …
Jojoba And Castor Oils As Fluid Of Biobased Greases: A Comparative Study, Refaat El-Adly, A. Bedier, F. Modather
Jojoba And Castor Oils As Fluid Of Biobased Greases: A Comparative Study, Refaat El-Adly, A. Bedier, F. Modather
Al-Azhar Bulletin of Science
The search for environmentally friendly materials that have the potential to replace mineral oil in various industrial applications is considered a priority research in the lubricant, fuel and energy sectors. Accordingly, vegetable oils seem to be a significant potential base fluid and a substitute for mineral oil as grease formulation. The aim of this paper is to study the comparison of jojoba and castor oils as base fluids for producing lithium lubricating greases. In this respect, the sulfurization of jojoba and castor oils was carried out at temperatures ranging from 110 to 170oC. The physicochemical properties of Sulfurized jojoba and …
Distribution And Abundance Of Zooplankton In The River Nile,Egypt, Nehad Sayed, Khadiga Gaber, Faten Elfeky
Distribution And Abundance Of Zooplankton In The River Nile,Egypt, Nehad Sayed, Khadiga Gaber, Faten Elfeky
Al-Azhar Bulletin of Science
Zooplankton is known to form an important component of the biological communities in large rivers due to their high abundance and ability to cycle nutrients through the aquatic environment. Little is known about these communities in the River Nile, so the present study was designed on samplingZooplankton in the River Nile (main body) and its two branches, Rosetta and Damietta, along four seasons of the year 2009. During the investigation period, Rotifera represented the most dominant species recording 54% followed by Protozoa, Cladocera, Copepoda, and Meroplankton with ratios of 17%, 15%, 9%, and 6% respectively. There were marked seasonal differences …
Variation Of Protein Profile Among Consecutive Stings Of The Scorpion Parabuthus Leiosoma (Family: Buthidae) From Egypt, Supports The Venom-Metering Hypothesis In Scorpions., Moustafa Sarhan, Maged Fouda, Alaa Elbitar, Hamdy Aly, Ahmed Sayed
Variation Of Protein Profile Among Consecutive Stings Of The Scorpion Parabuthus Leiosoma (Family: Buthidae) From Egypt, Supports The Venom-Metering Hypothesis In Scorpions., Moustafa Sarhan, Maged Fouda, Alaa Elbitar, Hamdy Aly, Ahmed Sayed
Al-Azhar Bulletin of Science
Scorpions use their venom to immobilize prey items and defend themselves against predators. Scorpion venom is a complex mixture composed of a wide array of substances such as salts, small molecules, peptides, and proteins. During analysis of the prey capture behavior of the scorpion Parabuthus leiosoma, we noticed that the scorpion stings the prey several successive stings in different specific regions. The stings started with ventral surface of the abdomen followed by thorax, shoulders and finally the head. This finding raised the possibility that the scorpion might use the venom with different composition in different contexts. To check this possibility, …
Effect Of Altitudinal Variations On The Distribution Of Nepeta Septemcrenata In Saint Katherine Protectorate, South Sinai, Egypt., M. Mansour, K. Omar
Effect Of Altitudinal Variations On The Distribution Of Nepeta Septemcrenata In Saint Katherine Protectorate, South Sinai, Egypt., M. Mansour, K. Omar
Al-Azhar Bulletin of Science
A study was carried out on a wild herb Nepeta septemcrenata Benth. (Family : Lamiaceae) in Saint Katherine Protectorate, South Sinai, Egypt to assess the effect of altitude (1400 to 2200 m above mean sea level) on plant distribution, morphological parameters, soil component and grazing pressure. The results show that elevation influence on physical and chemical properties of soil. Water content show great variation among different elevation ranks. Plant traits also affected by elevation gradient. Results found that N.septemcrenata cover, Importance value, Number of individuals and internodes length increased positively with elevation while species richness decreases. Plant width, height and …
Synthesis, Characterization And Thermal Studies On Some Transition Metal Complexes Of Tetrahydro-2-Thioxo-1h—Cyclopenta[B] Pyridine-3-Carbonitrile., Ali Hassan, Mostafa Omara, Abd Elaziz Elsid, Galal El Gemeie, Tarek Aly
Synthesis, Characterization And Thermal Studies On Some Transition Metal Complexes Of Tetrahydro-2-Thioxo-1h—Cyclopenta[B] Pyridine-3-Carbonitrile., Ali Hassan, Mostafa Omara, Abd Elaziz Elsid, Galal El Gemeie, Tarek Aly
Al-Azhar Bulletin of Science
A series of Cr(III), Co(II) , Cu(II) and Zn(II) complexes of two types (ML,ML ) Where L is 2, 5, 6, 7 – tetrahydro – 2 –thioxo – 1H- cyclopenta[b] pyridine- 3- carbonitrile are synthesized and confirmed by their elemental microanalysis, IR, electronic absorption spectra, magnetic moment and HNMR spectra. The various decomposition steps are determined from thermal analysis and determined the numbers of water molecules in the complexes. Kinetic parameters of the thermal decomposition have been evaluated and the data was refined using the least square method. Values of the activation energy, correlation coefficient and order of decomposition reaction …
Efficient Decolorization And Degradation Of Amaranth Azo Dye Via Photoelectrocatalytic Processes, Adham El-Zomrawy
Efficient Decolorization And Degradation Of Amaranth Azo Dye Via Photoelectrocatalytic Processes, Adham El-Zomrawy
Al-Azhar Bulletin of Science
This work assesses the electrocatalytic (EC), photocatalytic (PC), and photoelectron-catalytic degradation (PEC) of Amaranth azo dye with ammonium persulfate (APS). The results were observed that the photoelectrocatalytic degradation technique more efficient than other techniques. The effects of operational parameters such as initial pH and APS concentrations on color removal efficiency were investigated. Decolorization and degradation were found to depend strongly on the system parameters.The dye decolorization was enhanced using pH 2.0. The rate of degradation of Amaranth with APS followed pseudo–first order kinetics in the dye concentration. Decolorization efficiency (%) and degradation rates of amaranth were increase with increasing APS …
Assessment Of Surface Water Quality Of Suez Gulf., Mohamed Ibrahim, Omyma Mousa, Nazik Farid, Rabie Saad, Moustafa Omara
Assessment Of Surface Water Quality Of Suez Gulf., Mohamed Ibrahim, Omyma Mousa, Nazik Farid, Rabie Saad, Moustafa Omara
Al-Azhar Bulletin of Science
Suez gulf is the important region not only in Egypt but also around the world, because it is a vital location in connecting Red Sea with Mediterranean Sea through Suez Canal. Due to this nature in shipping ports, loading and unloading activities, gulf water is the most exposure to petrochemical pollution than other sea water. Not only petrochemical pollution can affect on gulf pollution but also chemical plants can be affected. Surface sea water samples at this study are collected from 7 sites from electricity location to hard steel company in attaqa road, including sewage co. The objective of this …
Synthesis, Characterization And Thermal Studies On Some Transition Metal Complexes Of 2-Thioxo-1,2,5,6,7,8-Hexahydro-Quinoline-3-Carbonitrile, Ali Hassan, Mostafa Omara, Abd Elaziz Elsid, Galal Gemeie, Tark Aly
Synthesis, Characterization And Thermal Studies On Some Transition Metal Complexes Of 2-Thioxo-1,2,5,6,7,8-Hexahydro-Quinoline-3-Carbonitrile, Ali Hassan, Mostafa Omara, Abd Elaziz Elsid, Galal Gemeie, Tark Aly
Al-Azhar Bulletin of Science
Binary ligand complexes of 2-thioxo-1,2,5,6,7,8-hexahydro-quinoline-3-carbonitrile (HL1) with Fe(III) , Co(II), Ni(II) and Cu(II) ions were prepared and characterized on the basis of elemental analysis, conductivity data, IR, 1H NMR, electronic spectra and magnetic susceptibility measurements. The conductivity data obtained are interpreted on the basis of the molecular structure of the ligand complexes. The IR spectral band of the complex are assigned to the proper stretching frequencies in comparison to these of the free ligand. The various decomposition steps are determined from thermal analysis and determined the numbers of water molecules in the complexes. Kinetic parameters of the thermal decomposition have …
Preparation And Evaluation Of New Anti-Corrosive Coating Based On Asphalt Cement (60/70) Blended With Polyesteramide Resin For Steel Protection, H. Abd Elwahab, A. Saleh, M. Wassel, N. Khalaf
Preparation And Evaluation Of New Anti-Corrosive Coating Based On Asphalt Cement (60/70) Blended With Polyesteramide Resin For Steel Protection, H. Abd Elwahab, A. Saleh, M. Wassel, N. Khalaf
Al-Azhar Bulletin of Science
The blending of a resin with asphalt cement is a simple method for improving the properties of anti-corrosive paints for the protection of steel. This paper outlines the potential of using asphalt cement blended with polyesteramide resin, for use in paints. Asphalt cement is the most extensively used economic coating material, whereas long polyesteramide resins are predominantly used for air, and force-dry, industrial coatings on metal surfaces. The aim of the research was to blend the two materials together with the objective of reinforcing the positive properties of the resin and attempting to compensate for the resins areas of weakness. …
Influence Of Chloride And Hydroxide Ions Concentrations On The Corrosion Behavior Of Al And Al-Si Alloy, A. Ibrahim, W. Ghanem, W. Hussien, N. Shehata
Influence Of Chloride And Hydroxide Ions Concentrations On The Corrosion Behavior Of Al And Al-Si Alloy, A. Ibrahim, W. Ghanem, W. Hussien, N. Shehata
Al-Azhar Bulletin of Science
The electrochemical behavior of Al and Al-Si alloy in NaCl and NaOH solutions have been studied in the absence and presence of some amino acids as corrosion inhibitor. Open-circuit measurements showed that both immersion potential (Eim.) and steady state potential (Es.s.) decreased and become more negative as the concentration of NaCl and NaOH increased, while the rate of film thickening independed on the solutions concentrations. Cyclic anodic polarization curves indicated a small hysteresis loop raising the possibility of pitting as well as crevices corrosion. The studies revealed that both glycine and valine adsorbed on the electrode surface and inhibited both …
Corrosion Inhibition And Adsorption Behavior Of New Schiff Base Surfactant On Steel In Acidic Environment: Experimental And Theoretical Studies, S. Soliman, M. Metwally, S. Selim, M. Awad, Mohamed Abbas, M. Bedair
Corrosion Inhibition And Adsorption Behavior Of New Schiff Base Surfactant On Steel In Acidic Environment: Experimental And Theoretical Studies, S. Soliman, M. Metwally, S. Selim, M. Awad, Mohamed Abbas, M. Bedair
Al-Azhar Bulletin of Science
Synthesis, adsorption and corrosion inhibiting effect of new Schiff base surfactant named 4-Hydroxy -3-(3-phenyl-allylideneamino)-benzene sulphonic acid2-[2-(2-{2-[2-(2-hydroxy-ethoxy)-ethoxy]-ethoxy}-ethoxy)-ethoxy]-ethyle ether (abbreviated as PAAB) on mild steel in 1.0 M HCl was investigated using weight loss and potentiodynamic polarization techniques. The results revealed that this compound inhibited the corrosion reaction in HCl environment. The results indicated that this inhibitor was adsorbed on the metal/solution interface. A theoretical study of the adsorption behavior of this compound was carried out in the framework of the semiempirical (SE) and molecular dynamics (MD).
Utilization Of Basalt On The Clinkerization Of Ordinary Portland Cement Clinker, Y. Ahmed, A. Abdel Rahman, M. El-Mahllawy, A. Elsayed
Utilization Of Basalt On The Clinkerization Of Ordinary Portland Cement Clinker, Y. Ahmed, A. Abdel Rahman, M. El-Mahllawy, A. Elsayed
Al-Azhar Bulletin of Science
This study comprises the effect of basalt as a flux and mineralizer on the formation of Portland cement clinker, where it used instead of sand, iron and clay at constant lime saturation factor. Three mixtures were prepared, the first formed from original raw materials, in second mixture the sand and iron replaced by basalt and in the third mixture the clay, sand and iron replaced by basalt. All these mixtures prepared at same lime saturation factor. Firing all these mixtures at same temperature 1350 oC with heating rate 10oC/min and for one hour as a soaking time. The chemical and …
General Synthesis And Properties Of Silver Nanoparticles By Chemical Reduction Method, Ali Hassan, E. Abdel-Aal, Moustafa Bakr, B. Damrany
General Synthesis And Properties Of Silver Nanoparticles By Chemical Reduction Method, Ali Hassan, E. Abdel-Aal, Moustafa Bakr, B. Damrany
Al-Azhar Bulletin of Science
Synthesis of silver nanoparticles which involves a number of steps occuring in the liquid phase. First, reduction of silver nitrate in presence of ammonia solution NH4OH by strong reducing agent such as formaldehyde solution. The size and size distribution of the resulting silver nanoparticles prepared by chemical reduction are strongly dependent on the states of silver initial concentrations. Preliminary, the reduction of silver ions in aqueous solution generally yields colloidal silver with particle diameters of several nanometres. Initially, the reduction of various complexes with Ag+ ions leads to the formation of silver atoms , which are followed by agglomeration into …
Spectrophotometric Method For The Determination Of Fexonfendine Hydrochloride In Pharmaceutical Formulations, M. Elnawawy, Rabie Farag, Yasser Abd Elkader, A. Adaway, S. Al-Salam
Spectrophotometric Method For The Determination Of Fexonfendine Hydrochloride In Pharmaceutical Formulations, M. Elnawawy, Rabie Farag, Yasser Abd Elkader, A. Adaway, S. Al-Salam
Al-Azhar Bulletin of Science
Spectrophotometric method have been developed for the assay of Fexonfendine hydrochloride (FEX) in pure and pharmaceutical formulations. This method is based on the formation of chloroform soluble ion-association complexes of (FEX) with picric acid(PIC), bromphenol blue (BPB) and with chlorophenol red (CPR) with absorption maximum at 403 nm , at 429 nm and 418 nm for PIC ,BPB and CPR, respectively. Reaction conditions were optimized to obtain the maximum color intensity. The absorbance was found to increase linearly with increasing in concentration of FEX,. Effect of the extracting solvents, effect of pH and effect of temperature on the stability of …
Applying A Novel Procedure For Printing Acrylic Fabrics With Anionic Dyes, A. Fathallah, L. El-Gabry
Applying A Novel Procedure For Printing Acrylic Fabrics With Anionic Dyes, A. Fathallah, L. El-Gabry
Al-Azhar Bulletin of Science
Acrylic fabrics are printed with anionic dyes i.e reactive dyes using finishing agent, N-methylol dihydroxyethylene urea (N-MDHEU) as a cross linker. Different factors that affecting on each of dye fixation as well as color yield are studied. Tensile strength and elongation % are investigated. The theoretical and applied aspects of fixing coloration of acrylic fabrics colored with reactive dyes by using new cross linking agent in the form of n-methylol compound are studied. The printed fabrics were evaluated for color yield and fastness properties. It was found that addition of (N-MDHEU) in printing past gave good printability with reactive dyes …
Nano Reactive And Nonreactive Polymers As Asphalt Modifiers For Anticorrosion Application, Elsayed Elnaggar, Hesham Nassar, Mohamed Migahed, Gamal Elkady, Hazem Elsherif, Amina Saleh
Nano Reactive And Nonreactive Polymers As Asphalt Modifiers For Anticorrosion Application, Elsayed Elnaggar, Hesham Nassar, Mohamed Migahed, Gamal Elkady, Hazem Elsherif, Amina Saleh
Al-Azhar Bulletin of Science
Anti-corrosive coatings for carbon steel were formulated using modified asphaltic materials. Nanoparticles of polyaniline (PANI-HCl) were prepared by template free polymerization method and compared with low-density polyethylene (LDPE) as a nonreactive polymer. FT-IR proved the formation of polyaniline and XRD demonstrated a relative crystalline structure of the polymer while SEM showed fibrous nano morphology. The two types of modifiers were mixed with asphalt of type 85/25 in different percentages. SEM proved that polymer content of 4%, for both polymers, represented the most homogeneous polymer distribution in the bitumen as the continuous phase. Asphalt modification with LDPE yielded the largest values …