@article { author = {HASSAN, Ali and NASSAR, A. and ABO ZAID, Y. and ABD EL-RAHMAN, N. and ABO ALI, M. and KEHELA, T.}, title = {Metal complexes of new pyrimidine azodye ligands synthesis, spectral studies, thermal analysis, X-ray diffraction and uses in ink synthesis.}, journal = {Al-Azhar Bulletin of Science}, volume = {22}, number = {Issue 2-A}, pages = {1-16}, year = {2011}, publisher = {Al-Azhar University, Faculty of Science (Boys)}, issn = {1110-2535}, eissn = {2636-3305}, doi = {10.21608/absb.2011.7012}, abstract = {Novel azodye ligands 2-Amino-3- (4-chloro phenylazo )-7-(4-fluorophenyl)-5-(thiophen-2-yl)-6,7-dihydropyrazolo (1,5-a) pyrimidine ( L1 ) and 2-Amino-3- (4-chlorophenylazo )-5,7-Di(thiophen-2-yl)-6,7-dihydropyrazolo(1,5-a) pyrimidine ( L2 ) and their complexes with Fe (III) , Co (II), Ni (II) and Cu (II) have been synthesized. The stereochemistry and the mode of bonding of the complexes were achieved based on elemental analysis , IR, UV-Vis, 1HNMR, MS and ESR spectroscopy as well as (TGA). Octahedral structure proposed for geometry of the chelates based on their electronic spectra and magnetic susceptibility. The metal complexes show no bleeding and tinting strength properties for ink synthesis.}, keywords = {Metal complexes,pyrimidine azodye ligands,ink synthesis}, url = {https://absb.journals.ekb.eg/article_7012.html}, eprint = {https://absb.journals.ekb.eg/article_7012_2e4cc9a801e9061102e6e0acf7157a09.pdf} } @article { author = {TAHER, M. and AL-SULAMI, A.}, title = {MORPHOLOGY AND MICROSTRUCTURE OF TRICALCIUM ALUMINATE HYDRATE PASTES AFTER HYDRATION IN PRESENCE OF INORGANIC ADMIXTURES}, journal = {Al-Azhar Bulletin of Science}, volume = {22}, number = {Issue 2-A}, pages = {17-24}, year = {2011}, publisher = {Al-Azhar University, Faculty of Science (Boys)}, issn = {1110-2535}, eissn = {2636-3305}, doi = {10.21608/absb.2011.7013}, abstract = {Tricalcium aluminate is considered as one of the most important material in the main inorganic compounds that constitute the cement. It plays an important role in controlling hydraulic characteristics for cement and leads to strength of concrete. Although its percent do not exceed (7-12%), of the total essential compounds constituting cement material , but it acquired special importance through its capability of reserving cement in a form paste, it can be handled easily during construction when water is add to cement. It is responsible of setting time in cement mixture so can be adjusted according to different whether conditions. To adjust setting time, organic or inorganic compounds must be added to cement mix in the presence of water to accelerate or retard hydration process according to the type of added admixture. In this study, the effect of inorganic admixtures (Ca(OH)2, Al(OH)3,CaCl2 and CaSO4.2H2O)on the hydration of tricalcium aluminate hydrate pastes after different periods was investigated using scanning electron microscope (SEM) . The results indicated that Al(OH)3 accelerate the hydration process while mixture of Ca(OH)2 and CaSO4.2H2O retard this process. Presence of Al(OH)3 with CaCl2 accelerate the hydration process . Presence of Al(OH)3 with mixture of Ca(OH)2 and CaSO4.2H2O decreased the retarding effect of this mixture on hydration process.}, keywords = {tricalcium aluminate,Hydration,inorganic admixture,improvement of the cement}, url = {https://absb.journals.ekb.eg/article_7013.html}, eprint = {https://absb.journals.ekb.eg/article_7013_81e61d2459cb559e7ad098a2d544dfa9.pdf} } @article { author = {HASSAN, Ali and NASSAR, Amer and HEAKAL, BASSEM and ABDELRAHMAN, N.}, title = {COMPLEXATION BEHAVIOR OF NEWLY SYNTHESIZED SCHIFF BASE N-(4-METHOXYPHENYL-4\-CYANOBENZILIDENE) AS CORROSION INHIBITION}, journal = {Al-Azhar Bulletin of Science}, volume = {22}, number = {Issue 2-A}, pages = {25-36}, year = {2011}, publisher = {Al-Azhar University, Faculty of Science (Boys)}, issn = {1110-2535}, eissn = {2636-3305}, doi = {10.21608/absb.2011.7014}, abstract = {Complexes of Nickel (II), Copper (II), Zinc (II) and Cadmium (II) ions with Schiff base derived from 4-cyanobenzaldehyde and 4-methoxyaniline were synthesized and investigated by several techniques using elemental analysis, FT-IR, UV-visible, 1HNMR, ESR, Magnetic susceptibility. The results revealed that, the synthesized ligand coordinate with the central metal ions through the azomethine nitrogen. Investigation of the stereochemistry of these complexes suggests the existence of tetrahedral geometries for Ni (II), Zn (II) and Cd (II) complexes where’s pesedotetrahedral geometries as expected for Cu (II) complex. The effect of the Schiff base ligand (1) and its corresponding Zn complex on the corrosion behaviors of C-steel in 0.5 M HCl acid solution were studied by weight loss measurements. The inhibitive effect of ligand (1) and its stable tetrahedral Zn complex is argued to their adsorption over the C-steel surface. Key word; Transition metal complexes, Schiff base, Corrosion inhibitor}, keywords = {N-(4-METHOXYPHENYL-4\-CYANOBENZILIDENE),Corrosion inhibition}, url = {https://absb.journals.ekb.eg/article_7014.html}, eprint = {https://absb.journals.ekb.eg/article_7014_4c71b7623ec570c1115dd21fc6251678.pdf} } @article { author = {HASSAN, Ali and ELREEFY, SOHAIR and ELSALAMOUNY, AHMED}, title = {NICKEL ION SELECTIVE POLY VINYL CHLORIDE MEMBRANE ELECTRODE BASED ON LIX 54}, journal = {Al-Azhar Bulletin of Science}, volume = {22}, number = {Issue 2-A}, pages = {37-44}, year = {2011}, publisher = {Al-Azhar University, Faculty of Science (Boys)}, issn = {1110-2535}, eissn = {2636-3305}, doi = {10.21608/absb.2011.7015}, abstract = {PVC based ion selective electrode, which was selective and sensitive to Ni (II) ions, was developed using 1- phenyldecane - 1,3 - diones (LIX 54) as a carrier. The electrode exhibited a good potentiometric response for Ni (II) over a wide concentration range (1.0×10-5 – 1.0×10-1 M) with a slope 29.1 + 1.6 mV/decade. The proposed electrode has a response time about 25 s. The electrode is suitable for use in aqueous solutions in a wide pH range of 8.0 to 9.5. The proposed electrode was used in two different applications such as the determination of nickel concentration in nickel-cadmium battery and as an indicator electrode for potentiometric titration of Ni2+ion with EDTA.}, keywords = {Nickel ion selective electrode,LIX 54,Potentiometry}, url = {https://absb.journals.ekb.eg/article_7015.html}, eprint = {https://absb.journals.ekb.eg/article_7015_55eaeb7a4c95b2d121f9df13e8d60516.pdf} } @article { author = {HASSAN, Ali and ELREEFY, SOHAIR and ELSALAMOUNY, AHMED}, title = {COATED WIRE LEAD ION SELECTIVE ELECTRODE BASED ON DITHIZONE}, journal = {Al-Azhar Bulletin of Science}, volume = {22}, number = {Issue 2-A}, pages = {45-52}, year = {2011}, publisher = {Al-Azhar University, Faculty of Science (Boys)}, issn = {1110-2535}, eissn = {2636-3305}, doi = {10.21608/absb.2011.7016}, abstract = {PVC based membrane of 1,5-diphenylthiocarbazone (dithizone) reveals a Nernstain potentiometric response with the slope of 29 + 2 mV per decade for Pb2+ over a concentration range (5.0×10-6-1.0×10-2 M). The used electrode was suitable in aqueous solutions in a pH range of 8 to 10. The response time of the electrode is about 15 s and was used for a period of 45 days. The proposed electrode was used in two different applications such as the determination of lead concentration in a part of lead water pipe and as an indicator electrode for potentiometric titration of Pb2+ions.}, keywords = {Lead ion selective electrode,Potentiometric titration,INDICATOR ELECTRODE}, url = {https://absb.journals.ekb.eg/article_7016.html}, eprint = {https://absb.journals.ekb.eg/article_7016_707d6ea27a89aeb64f702efc0a196314.pdf} } @article { author = {IBRAHIM, N. and EL-ZAIRY, W. and EL-ZAIRY, M. and GHAZAL, H.}, title = {DYEING AND FUNCTIONAL PROPERTIES OF POLYAMIDE-6 FABRIC DYED WITH NATURAL DYES}, journal = {Al-Azhar Bulletin of Science}, volume = {22}, number = {Issue 2-A}, pages = {53-64}, year = {2011}, publisher = {Al-Azhar University, Faculty of Science (Boys)}, issn = {1110-2535}, eissn = {2636-3305}, doi = {10.21608/absb.2011.7017}, abstract = {There is increasing interest in adding value to polyamide-6 fabrics via upgrading their functional properties. In the present study, selected natural dyes namely madder and safflower yellow dyes as well as mordants namely alum, Zn-sulfate and tannic acid have been used to identify the proper dyeing conditions for attaining high quality natural dyeings along with imparting multifunctional properties, i.e. anti-UV and anti-bacterial properties, to the dyed polyamide- 6 fabric. The results demonstrate that the improvement in dyeing properties, i.e. color yield as well as fastness properties, along with the enhancement in the imparted functional properties are governed by the type and concentration of natural dye, kind of mordant, dyeing sequence and conditions. The dyes / mordants examined exhibited high fastness properties and offering better UV-protection function and antimicrobial activity against G-ve bacteria (E-coli).}, keywords = {polyamide-6,Natural dyes,Mordants,anti-UV,Anti- microbial}, url = {https://absb.journals.ekb.eg/article_7017.html}, eprint = {https://absb.journals.ekb.eg/article_7017_16957d030f389afc450b166b0df62fa6.pdf} } @article { author = {}, title = {ENCAPSULATION OF NPK MINERAL FERTILIZER GRANULES BY DIFFERENT TYPES OF ALKYD RESINS}, journal = {Al-Azhar Bulletin of Science}, volume = {22}, number = {Issue 2-A}, pages = {65-80}, year = {2011}, publisher = {Al-Azhar University, Faculty of Science (Boys)}, issn = {1110-2535}, eissn = {2636-3305}, doi = {10.21608/absb.2011.7018}, abstract = {Three different kinds of alkyd resins were used for encapsulation a commercial granules fertilizers NPK (N 12%, P2O5 8% and K2O 18%) with particle diameter ranges from 3 to 5 mm. The total concentration of the alkyd coated film was less than 10 % of the total weight of the fertilizer composition. The release rate was measured by conductivity test. The area of the coating film was determined by mathematical calculations. Controlled release parameters including membrane thickness, granule radius and type of resin were taken into consideration.}, keywords = {Controlled-release fertilizer,Alkyd resins,Encapsulation NPK}, url = {https://absb.journals.ekb.eg/article_7018.html}, eprint = {https://absb.journals.ekb.eg/article_7018_66fd64a3dee705e066122b625ef80e99.pdf} } @article { author = {}, title = {NEW THICKENING AGENT BASES ON ALOE VERA GEL FOR DISPERSE PRINTING OF POLYESTER}, journal = {Al-Azhar Bulletin of Science}, volume = {22}, number = {Issue 2-A}, pages = {81-92}, year = {2011}, publisher = {Al-Azhar University, Faculty of Science (Boys)}, issn = {1110-2535}, eissn = {2636-3305}, doi = {10.21608/absb.2011.7019}, abstract = {The technical feasibility of using Aloe vera gel as a new thickener for printing polyester with disperse dyes was examined. Results obtained indicate that the properties of the printed fabric samples (colour strength K/S and over-all fastness properties, handle and sharpness are determined by jel concentration, type and concentration of additive, i.e. (urea, citric acid), as well as the fixation condition using super-heated steam technique. The optimum conditions for printing polyester fibre with disperse dyes using Aloe vera jel as a thickener, were as follow: 30 g/kg disperse dye, 50g/kg urea, 15g/kg citric acid, 500g/kg Aloe vera thickener 50% ,drying at 100°C/3 min followed by steam fixation for 6 min. at 180°C.}, keywords = {Aloe vera,Thickener,polyester,Disperse Printing}, url = {https://absb.journals.ekb.eg/article_7019.html}, eprint = {https://absb.journals.ekb.eg/article_7019_a25484b7478fca939ada0d35256c7b1a.pdf} } @article { author = {}, title = {DYEING OF WOOL/POLYESTER BLENDED FABRICS USING BASIC DYES.}, journal = {Al-Azhar Bulletin of Science}, volume = {22}, number = {Issue 2-A}, pages = {93-112}, year = {2011}, publisher = {Al-Azhar University, Faculty of Science (Boys)}, issn = {1110-2535}, eissn = {2636-3305}, doi = {10.21608/absb.2011.7020}, abstract = {The main task of this study is to establish a one step dyeing of wool/polyester blended fabric using basic dyes. Wide range of parameters has been studied such as pH values, PEG-600 concentration, dyeing technique, fixation time and temperature. The best dyeing conditions were achieved, using different colors of basic dyes at pH 9. The color strength (K/S) values of the dyed blend with temperature increased rapidly the fixation time and temperature until 30 min. at 130˚C.This was followed by a relatively increase in the k/s values by using different amounts of PEG-600. The dyeing technique has an important effect on the k/s values and the improvement can follow the decreasing order of exhaustion under pressure< exhaustion< pad-dry cure method.}, keywords = {wool,polyester,basic dyes}, url = {https://absb.journals.ekb.eg/article_7020.html}, eprint = {https://absb.journals.ekb.eg/article_7020_012cd07a322a3279ec35bd38497468a4.pdf} } @article { author = {NAGIUB, A. and EL-ERIAN, M. and HASHEM, M. and EL-SABBAH, M.}, title = {EVALUATION OF ELECTROCHEMICAL CORROSION FOR MILD STEEL EXPOSED TO DIFFERENT CHLORIDE MEDIA.}, journal = {Al-Azhar Bulletin of Science}, volume = {22}, number = {Issue 2-A}, pages = {113-128}, year = {2011}, publisher = {Al-Azhar University, Faculty of Science (Boys)}, issn = {1110-2535}, eissn = {2636-3305}, doi = {10.21608/absb.2011.7021}, abstract = {The influence of different chloride media such as 3.5%NaCl, 10% NaCl, Vätäänen nine salt solutions (VNSS) prepared as artificial seawater and natural seawater on the corrosion of mild steel (MS) has been studied using electrochemical polarization techniques. The effect of the addition of starch, glucose, yeast extract, peptone, and mixture of growth media on the corrosion behavior of mild steel has been also discussed. The order of the rate of decrease in oxide film thinning proceeds according to the following order of the type of the applied medium: 10%NaCl > seawater > VNSS > 3.5%NaCl. On the other hand in case of mild steel immersed in VNSS in presence of different nutrients the rate of oxide film thinning proceed according to the following order of the type of growth medium: Peptone < glucose < yeast extract < mixture of growth media ≈ starch. Seawater was found to be less corrosive than VNSS. Addition of the growth media induced a decrease in both the cathodic and anodic currents and acted as a mixed type inhibitor. Cyclic polarization scans illustrate little decrease in the pitting tendency in the presence of growth media.}, keywords = {mild steel,electrochemical polarization techniques,Growth media,artificial seawater}, url = {https://absb.journals.ekb.eg/article_7021.html}, eprint = {https://absb.journals.ekb.eg/article_7021_0379b2b00dbc134bc900bf0f53f00029.pdf} } @article { author = {ABOU SHAHBA, R. and ATTIA, E. and ABDEL GANY, N. and EL-M ONEIM, A. and DEIAB, N.}, title = {TRIALS FOR BEST OXYGEN EVOLUTION EFFICIENCY OF MnMo- OXIDE ANODE DEPOSITED ON IrO2/Ti SUBSTRATE AND ELECTROLYZED IN 0.5M NaCL}, journal = {Al-Azhar Bulletin of Science}, volume = {22}, number = {Issue 2-A}, pages = {129-140}, year = {2011}, publisher = {Al-Azhar University, Faculty of Science (Boys)}, issn = {1110-2535}, eissn = {2636-3305}, doi = {10.21608/absb.2011.7022}, abstract = {Hydrogen is produced in this study by direct electrolysis at 1000 Am-2 in 0.5M NaCl solution of pH 2 at room temperature. Direct and pulse current electro-deposition methods have been applied to the preparation of MnMo-oxide anode deposited on IrO2/Ti substrate. The beneficial effects of pulse deposition and timings on the performance of MnMo-oxide anodes during electrolysis and the physicochemical properties of the deposits were characterized using SEM and electrochemical techniques.}, keywords = {Electrolysis,electro-deposition,oxygen evolution efficiency}, url = {https://absb.journals.ekb.eg/article_7022.html}, eprint = {https://absb.journals.ekb.eg/article_7022_b2c43f0e60f3c25d3e5352565a78c507.pdf} } @article { author = {MOUSTAFA, MAHMOUD and HESSEEN, ABED ELHALEEM and HASSAN, MOUSTAFA and ABED ALLAHA, EHAB}, title = {PHYSICOCHEMICAL STUDIES OF NICKEL AND COPPER COMPLEXES WITH TAR AND SIMULTANEOUS DETERMINATION OF THE METAL IONS IN MIXTURES BY DERIVATIVE SPECTROPHOTOMETRY}, journal = {Al-Azhar Bulletin of Science}, volume = {22}, number = {Issue 2-A}, pages = {141-152}, year = {2011}, publisher = {Al-Azhar University, Faculty of Science (Boys)}, issn = {1110-2535}, eissn = {2636-3305}, doi = {10.21608/absb.2011.7023}, abstract = {Nickel(II) and Copper(II) chelates of 4-(2̀–thiazolylazo)resorcinol (TAR) were reported. The dissociation constants of the ligand and the stability constants of the metal complexes were calculated pH-metrically and spectrophotometrically at 25 ◦C, in 50% (v/v) ethanol and 0.1 M ionic strength. The effects of an acid or a base on the visible absorption behaviour of the ligand and complexes has been investigated. Nickel and copper react with 4-(2̀–thiazolylazo)resorcinol (TAR) to form a binary complexes. The equilibria occurring in solution were established and the basic characteristics of the complexes formed were determined. The complexation reaction in the systems investigated were demonstrated and characterized using graphical logarithmic analysis of the absorbance versus pH graph. The composition of the formed complexes with the reagent have been determined. The molar absorptivity of the binary system is investigated. The binary systems obeyed beer's law up to 0.23 and 0.25 µg/ml for Ni2+ and Cu2+ respectively. A simple and highly sensitive procedure for spectrophotometric determination of Ni2+ and Cu2+ has been developed. A method for the simultaneous determination of nickel and copper in mixtures by first-derivative spectrophotometry is described. Zero-crossing measurement technique is found suitable for the simultaneous determination of the metal ions. The method has been applied to direct determination of copper and nickel in dome synthetic mixtures without any separation.}, keywords = {Nickel(II) and Copper(II),TAR,Stability constants,POTENTIOMETRIC TITRATIONS,Spectrophotometry,simultaneous determination of copper and nickel}, url = {https://absb.journals.ekb.eg/article_7023.html}, eprint = {https://absb.journals.ekb.eg/article_7023_53fca7b11e6d62c67d022da42925496c.pdf} } @article { author = {MOUSTAFA, MAHMOUD and HESSEEN, ABED ELHALEEM and HASSAN, MOUSTAFA and ABED ALLAHA, EHAB}, title = {POTENTIOMETRIC AND SPECTROSCOPIC STUDIES OF NICKEL(II), COPPER(II) AND ZINC(II) COMPLEXES WITH SALICILIDEN 2-AMINOTHIAZOLE}, journal = {Al-Azhar Bulletin of Science}, volume = {22}, number = {Issue 2-A}, pages = {153-164}, year = {2011}, publisher = {Al-Azhar University, Faculty of Science (Boys)}, issn = {1110-2535}, eissn = {2636-3305}, doi = {10.21608/absb.2011.7024}, abstract = {Metal complexes of the divalent ions Ni, Cu and Zn with a Schiff base obtained through condensation of salicylaldehyde with 2-aminothiazole has been investigated potentiomerically and spectrophotometrivally. The stoichiometric formula of the obtained complexes are: Ni(SAT)2, Cu(SAT)2 and Zn(SAT) where: SAT = saliciliden 2-aminothiazole. The formation constants of proton-ligand and metal-ligand complexes have been determined at 25 oC and 0.1 M (NaClO4) ionic strength in 50% (V/V) ethanol - water solution. The formation constants values obtained from spectrophotometric studies are found to be consistent with those obtained from potentiometric studies. The complexation reaction in the systems investigated were demonstrated and characterized using graphical logarithmic analysis of the absorbance versus pH graph. The binary systems obeyed beer's law up to 0.21, 0.19 and 0.24 µg/ml and the molar absorptivity ɛ = 3.12 x 103, 2.16 x 103 3.80 x 103 l mol-1 cm-1 for Ni2+, Cu2+ and Zn2+ respectively.}, keywords = {Nickel(II), Copper(II) and Zinc(II),Schiffbase,Stability constants,Stoichiometry,POTENTIOMETRIC TITRATIONS,spectrophotometric study}, url = {https://absb.journals.ekb.eg/article_7024.html}, eprint = {https://absb.journals.ekb.eg/article_7024_4250d04e9340a218bc2d530f9913bf68.pdf} } @article { author = {ABDELALL, MAHMOUD and MOHAMED, SHABAN and HALAWA, AHMED and HASSAN, AHMED and ELNASSAG, MOHAMED}, title = {SYNTHESIS AND ANTIMICROBIAL ACTIVITY OF SOME NEW COUMARIN, PYRIDINE, 1,2,3-TRIAZOLE, THIAZOLIDINONE, PYRAZOLOTRIAZINE, THIOPHENE AND THIAZOLE DERIVATIVES BEARING CARBONYLHYDRAZONOETHYLPHENYLTOSYLATE MOIETY}, journal = {Al-Azhar Bulletin of Science}, volume = {22}, number = {Issue 2-A}, pages = {165-180}, year = {2011}, publisher = {Al-Azhar University, Faculty of Science (Boys)}, issn = {1110-2535}, eissn = {2636-3305}, doi = {10.21608/absb.2011.7025}, abstract = {A number of novel coumarin (4), pyridinone (5a,b), thiophenopyridinone (6), 1,2,3-triazole (7), pyrazolotriazine (10), thiazole (11,14a,b,15), thiophene (12), thiazolidinone (20,21,23) derivatives were synthesized via interaction of 4-(1-(2-(2-cyanoacetyl)hydrazono)ethyl)phenyltosylate (3) with different nucleophilic reagents. The structures of the newly synthesized compounds were confirmed by elemental analyses IR, 1H-NMR and mass spectral data. All compounds were evaluated for their antimicrobial activities.}, keywords = {yanoacetylhydrazonoethylphenyltosylate,Pyridine,thiazole,Coumarin,THIOPHENE,pyrazolotriazine,thiazolidinone}, url = {https://absb.journals.ekb.eg/article_7025.html}, eprint = {https://absb.journals.ekb.eg/article_7025_d8dd21e78ad721ced33ab79d4270106c.pdf} } @article { author = {HUSSEIN, ABDEL HALEEM and KHAMES, AHMED and EL-ADASY, ABU-BAKR and EL-TAWEEL, S.}, title = {-OXOANILIDE AS BUILDING BLOCKS IN HETEROCYCLIC SYNTHESIS: A NEW SYNTHESIS OF POLYFUNCTIONALLY SUBSTITUTED PYRIDINES, PYRANS AND PYRIMIDINES}, journal = {Al-Azhar Bulletin of Science}, volume = {22}, number = {Issue 2-A}, pages = {181-192}, year = {2011}, publisher = {Al-Azhar University, Faculty of Science (Boys)}, issn = {1110-2535}, eissn = {2636-3305}, doi = {10.21608/absb.2011.7026}, abstract = {β-Oxoanilide 1 reacted with acetyl isothiocyanate and ethoxycarbonyl isothiocyanate to givepyridine derivatives 6a,b and pyrimidinethiol 8 respectively. While with arylidine malononitrile gave the pyran derivative 12. Similarly, treatment of 1 with arylidine cyanoacetamide or arylidine cyanothioacetamide afforded the pyridine derivatives 13a,b, 14a,b respectively. Condensation of 1 with aromatic aldehyde obtained the cyclohexenones 19a-c. The reaction of 1 with a mixture of aromatic aldehyde and urea or thiourea gave the pyrimidine derivatives 23a,b. Treatment of compound 1 with arylidine acetophenone yield the cyclohexene derivatives 26a,b. Reaction of 1 with a mixture of ethyl cyanoacetate and sulfur yield the thiophene derivative 27. Which was reacted with formamide, potassium thiocyanate and hydrazine to afford the thienopyrimidines 28, 29 and the hydrazide derivative 30. respectively.}, keywords = {OXOANILIDE,HETEROCYCLIC SYNTHESIS}, url = {https://absb.journals.ekb.eg/article_7026.html}, eprint = {https://absb.journals.ekb.eg/article_7026_8aa9293860fb343bd47f27ad6133cbc2.pdf} } @article { author = {SOLIMAN, E. and MOSTAFA, A. and MOHY EL-DIN, M. and ABD EL-NAEEM, G.}, title = {COMPARATIVE STUDY BETWEEN HIGH PERFORMANCE LIQUID CHROMATOGRAPHY AND GAS CHROMATOGRAPHY FOR DETERMINATION OF BISPHENOL A IN THE BABY BOTTLES}, journal = {Al-Azhar Bulletin of Science}, volume = {22}, number = {Issue 2-A}, pages = {193-204}, year = {2011}, publisher = {Al-Azhar University, Faculty of Science (Boys)}, issn = {1110-2535}, eissn = {2636-3305}, doi = {10.21608/absb.2011.7027}, abstract = {In this study, bisphenol A (BPA), the migrant from the polycarbonate baby bottles was determined using high performance liquid chromatograph (HPLC) with both detectors, (fluorescence, FLU and UV) and gas chromatograph with mass spectrophotometer detector (GC/MS). The results exhibited a noticable variation in the amounts of BPA measured by HPLC using both FLU and UV detectors at the same condition. However, this variation was more pronounced between the results of HPLC/FLU analyses and the corresponding ones for the same sample at GC/MS. Since, the BPA levels in the HPLC analyses were lower than those in the GC/MS analyses. Meanwhile, the detection limit of BPA was broader for the HPLC method comparing with that for GC/MS method. These differences in measured BPA levels for both two chromatographic methods may result mainly from low sensitivity noticed in HPLC method, particularly, at lower BPA levels and relatively poor resolution at higher BPA levels. This is due to the great varied sensitivity between the two instruments (HPLC)& (GC/MS) and between the two detectors of HPLC (FLU&UV). However, there was no report, which simultaneously evaluated the two methods in real analyses. We found that there were strong variation between BPA levels in the baby bottles samples with the two methods, for this we recommended the GC/MS for The BPA detection method.}, keywords = {Bisphenol A-Polycarbonate,Migration Baby bottles,HPLC–GC/MS}, url = {https://absb.journals.ekb.eg/article_7027.html}, eprint = {https://absb.journals.ekb.eg/article_7027_f1538e20bdf75719ea46241d9d23c395.pdf} } @article { author = {ELNAGGAR, ELSAYED and ELSHERIF, HAZEM and MIGAHED, MOHAMED and ELKADY, GAMAL}, title = {NANO REACTIVE POLYMER BASED ON POLYANILINE AS ASPHALT MODIFIER FOR ANTICORROSION APPLICATION}, journal = {Al-Azhar Bulletin of Science}, volume = {22}, number = {Issue 2-A}, pages = {205-219}, year = {2011}, publisher = {Al-Azhar University, Faculty of Science (Boys)}, issn = {1110-2535}, eissn = {2636-3305}, doi = {10.21608/absb.2011.7028}, abstract = {Recently, the application of nanotechnology in the corrosion protection of metals has gained momentum. On the other hand, polymers are used as corrosion inhibitor coatings that are physically, chemically or electrochemically deposited on the metal substrate. Although asphalt has low cost, high cohesive nature, rheological properties and high thermal resistance but it is not practically used on a large scale in anticorrosion applications. So, the aim of this research is to use the nanotechnology science in preparing modified asphaltic materials to produce new and more qualified anti-corrosive coatings. To achieve this aim, nanoparticles of polyaniline (PANI-H2SO4) using template free polymerization method are prepared and characterized by FTIR, XRD and SEM. Another nonreactive polymer of type low density poly ethylene (LDPE) has been used for comparison purpose. The two types of modifiers have mixed with asphalt of type 85/25 in different percentages as 2, 4, 6, 8& 10٪by the weight of the virgin bitumen. The modified asphalt samples have physically tested and the morphology by SEM has conducted. The ability of modified bitumen samples to serve as corrosion protective coatings for carbon steel has examined by open circuit potential-time (Eocp-time), and potentiodynamic polarization in 0.5 M HCl solution. The results revealed that all the prepared samples show a good behavior as anticorrosive materials and bitumen modified by PANI-H2SO4 is the most qualified material as it had protection efficiency of 99.996 % with respect to uncoated CS while the protection efficiency of PMA/LDPE is 99.98 %.}, keywords = {Nanopolymer,Polyaniline,polymer modified asphalt,anticorrosive coating}, url = {https://absb.journals.ekb.eg/article_7028.html}, eprint = {https://absb.journals.ekb.eg/article_7028_67ae6ab96601dbef10653bfbe9f69098.pdf} } @article { author = {}, title = {KINETICS AND THERMODYNAMIC STUDIES ON REMOVAL OF COPPER METAL ION FROM AQUEOUS SOLUTION USING RICE STRAW}, journal = {Al-Azhar Bulletin of Science}, volume = {22}, number = {Issue 2-A}, pages = {109-126}, year = {2011}, publisher = {Al-Azhar University, Faculty of Science (Boys)}, issn = {1110-2535}, eissn = {2636-3305}, doi = {10.21608/absb.2011.7370}, abstract = {The adsorption percentage of Cu(II) ions from aqueous solution in the absence and in the presence of different concentration of hydrochloric acid on rice straw (SIII) and its ash (R400) were studied in a modified batch adsorption technique. The kinetic data was analyzed using various kinetic models particularly pseudo-first-order, pseudo-second-order and intra-particle diffusion. The pseudo-second-order kinetic model was found to agree well with the experimental data. Thermodynamic parameters such as enthalpy (H°), free energy (G°) and entropy (S°) changes towards calculated and adsorption process was spontaneous at R400 in the absence and in the presence of 0.005 M HCl and exothermic in nature.}, keywords = {}, url = {https://absb.journals.ekb.eg/article_7370.html}, eprint = {https://absb.journals.ekb.eg/article_7370_4ee1b74b806f3d492979bf67b12de854.pdf} } @article { author = {}, title = {PHOTOCATALYTIC DEGRADATION OF DIRECT BLUE-1 DYE ON ZrO2, SULPHATED ZrO2 AND V2O5-ZrO2/SO4 CATALYSTS}, journal = {Al-Azhar Bulletin of Science}, volume = {22}, number = {Issue 2-A}, pages = {125-145}, year = {2011}, publisher = {Al-Azhar University, Faculty of Science (Boys)}, issn = {1110-2535}, eissn = {2636-3305}, doi = {10.21608/absb.2011.7371}, abstract = {Sulfated (5wt.%) ZrO2 and non-sulfated ZrO2 modified by NH4VO3 using incipient wetness impregnation technique to achieve a loading of 5wt.% V2O5 were thoroughly characterized by means of X-ray powder diffraction (XRD), Fourier-transform infrared spectroscopy, N2 sorptiometry, particle size analyzer and pyridine-FT-IR that was used to investigate the acidity of the samples. Degradation of direct blue-1 (DB) dye was tested for the effectiveness of the samples. The results revealed that DB degradation was highly improved with V supported on ZrO2–SO4 and showed a conversion comprises of 95% after UV irradiation (emitting at 365 nm) for 60 min exceeding that of SO4 free ZrO2 sample (68%) obtained at the same period of illumination. This was due to the large surface area (183 m2 g-1), small crystallites size and presence of basic sites namely O2− and OH− moieties, those take part in the reaction as additional oxidizing agents. The photocatalytic degradation of DB was found to follow first order rate kinetics. More information on the activity, surface texturing, kinetics and TOC removal were well evaluated, compared and discussed for all samples.}, keywords = {}, url = {https://absb.journals.ekb.eg/article_7371.html}, eprint = {https://absb.journals.ekb.eg/article_7371_93f898cdbe45609f144343b6739f6dd9.pdf} } @article { author = {}, title = {OPTIMIZED AND VALIDATED SPECTROPHOTOMETRIC METHODS FOR THE DETERMINATION OF CLOMIPRAMINE AND PAROXETINE HYDROCHLORIDE IN DRUG FORMULATIONS}, journal = {Al-Azhar Bulletin of Science}, volume = {22}, number = {Issue 2-A}, pages = {159-172}, year = {2011}, publisher = {Al-Azhar University, Faculty of Science (Boys)}, issn = {1110-2535}, eissn = {2636-3305}, doi = {10.21608/absb.2011.7373}, abstract = {Two simple and sensitive spectrophotometric methods have been developed for the determination of some anti-depressant drugs such as clomipramine (CLO) and paroxetine (PRX). The methods involved the formation of ion-pairs between the inorganic complexes of molybdenum(v) thiocyanate and hexakis iron(III) solution followed by extraction with 1,2- dichloroethane. The optimum conditions for the ion-pairs formation were established under which Beer,s low was obeyed for CLO and PRX in the concentration range 5-150 and 10-250 μg mL-1 for the first method, while it was obeyed for the second method in the concentration range of 10 - 200 μg mL-1 for both CLO and PRX drugs, respectively. The limits of detection were 0.0744 and 0.109 μg mL-1 and 0.177 and 0.113 μg mL-1 for CLO and PRX using the first and second methods, respectively. The limits of quantification for the first method were 0.223 and 0.531 μg mL-1 while they were 0.327 and 0.340 μg mL-1 using the second method for CLO and PRX drugs, respectively. Both of the two methods have been successfully applied for the determination of the cited drugs in row materials and in drug formulations and compared with the official reference methods. Complete validation of the proposed methods was done.}, keywords = {}, url = {https://absb.journals.ekb.eg/article_7373.html}, eprint = {https://absb.journals.ekb.eg/article_7373_6c784c7e46f6352f7b8a8a30f04f3994.pdf} }