2024-03-28T13:52:05Z
https://ejchem.journals.ekb.eg/?_action=export&rf=summon&issue=463
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2017
60
2
Herbal Textile Finishes – Natural Antibacterial Finishes for Cotton Fabric.
Saad
Zaghloul
Amira
El-shafie
Manal
El-bisi
Rakia
Refaie
Abstract Improvement of physical properties in a addition to impart antimicrobial properties to cotton fabric and modified cotton fabric by using herbal in the presence of softeners is the target of the present work, first of all modification of cotton fabric was done during cationization process by the means of cationizing agent, namely, 3-chloro-2-hydroxypropyl trimethyl ammonium chloride (Quat-188); also, cotton fabric was modified during carboxymethlation process of it. And then treatments of cotton and modified cotton fabrics was carried out by different concentration of both Neem and Tulsi Extract as essential oil in the presence of Silicon Micro Emulsion (SiME) or Nonionic softeners for improving the performance of the treated fabric. Physical properties evaluations of the treated fabric were done by monitoring tensile strength, elongation, roughness, water absorbency (wettability). Finally the treated fabrics was evaluated as antimicrobial and characterized by the mean of Scanning Electron Microscope (SEM). Key words: Cotton; Antimicrobial; Textile Finishing; Herbal; Medical textile; Essential oil.
Cotton
Antimicrobial
textile finishing
Herbal
Medical textile
essential oil
2017
04
30
161
180
https://ejchem.journals.ekb.eg/article_1519_8806e01746d58fdc204da6f93f49e8a0.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2017
60
2
Amphiphilic Cellulose as Stabilizer for Oil/ Water Emulsion
In this work, amphiphilic ethyl amino-cellulose as oil/water emulsion stabilizer was prepared from bagasse by extraction of cellulose from bleached bagasse pulp. By periodate oxidation of cellulose the corresponding C-2/C-3 dialdehyde cellulose produced, which reacted with ethyl amine to obtain ethyl amino-cellulose (amphiphilic cellulose) through Schiff's base reaction (reductive amination). The produce ethyl-amino cellulose has a great attention in soybean oil/ water stabilization.The amphiphilic cellulose was characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction, Transmission electron microscopy (TEM), Thermal gravimetric analysis (TGA), and Differential Scanning Calorimetry (DSC). Foureir transform infrared spectroscpy has been proved the incorporation of soybean oil in ethyl amino-cellulose by as their is a new groups appeared in the foureir transform infrared spectra of the prepared emulsion. TEM used to prove the nano-size of the prepared samples. TGA and DSC proved the thermal stability and melting temperature. Sample was successfully applied as stabilizer of soybean oil in water emulsion.
Amphiphilic polymers
Periodate oxidation
Amino-functionalization
soybean oil /water emulsion
2017
04
30
181
204
https://ejchem.journals.ekb.eg/article_1520_c69305d27b494e2c5b5a916094c3617e.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2017
60
2
Studies on The Effects of Kaolin and Modified Kaolin on the Flammability of APP/PP System
Marwa
Sherief
Adly
Hanna
Eglal.
Souaya
Alaa
Abdelmoaty
This work is a continuation of the previous works by the authors to increase the effeciency of ammonium polyphosphate(APP) as flame retardant for polypropylene(PP). In this work a more abundant kaolin was used. Also to improve the effciency of kaolin, an acid modification by sulfuric acid was used. XRD, XRF, IR, SEM and BET were used to characterization the samples. TGA and DTA were used to evaluate the prepared samples as flame retardant. For comparison, six samples of (APP/ Ore kaolin)/PP were prepared and other six samples (APP/Modified kaolin)/PP have the same composition and identical to the ore kaolin were prepared. The analysis of the XRD, IR and SEM results indicate that the acid treatment of kaolin increases the SiO2 content which lead to increase the surface area. In the same time the acid leachig causes some destortion in the crystallinity and the layers. The evaluation of the flamability of the system by using the TGA indicate that the presence of kaolin increases the time of degradation of PP. On other hand, the modification of kaolin by sulfuric acid improves the role of the kaolin when added to the APP.
: kaolin
modification
flamability
Characterization
2017
04
30
205
219
https://ejchem.journals.ekb.eg/article_1521_96ca71bc31b2b586c83048414e6404c1.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2017
60
2
Sequestration of Methylene Blue and Lead ions by MWCNT Modified with Polyconducting Polymers
Mona
Shouman
Amina
Attia
Nady
Fathy
Khadiga
Abbas
Saeed
Sayyah
Amgad
Bolis
Taking into consideration the perspective of green chemistry, an attempt was made to investigate regenerative material for carbon nanotubes (CNTs) with high productivity. The special properties of CNTs, such as easy functionalization ability, high surface area, and unique thermal, mechanical, and electrical properties, make them an appealing component for composite materials, which resulted in the attraction of great interest on CNT-based composites. This research work focuses mainly on multiwall carbon nanotubes (MWCNTs) synthesized from camphor over iron nitrate catalyst supported on alumina by wet impregnation method. The formation of MWCNTs and incorporation of poly conducting polymers (o- and m-Toluidine) on the surface of MWCNTs was confirmed by high resolution transmission electron microscope (HRTEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR), Ultraviolet visible spectroscopy (UV-Vis), low temperature nitrogen adsorption and Thermo-Gravimetric analysis (TGA). The performance evaluation of as-synthesized MWCNTs and their nanocomposites towards adsorption of methylene blue (MB) dye and Pb(II) was also highlighted. MWCNTs and their nanocomposites pose a great potential as a promising material for application in adsorption from aqueous solution.
MWCNT – conducting polymers – nanocomposite – adsorption – dye – heavy metal
2017
04
30
221
241
https://ejchem.journals.ekb.eg/article_1583_8abc1174747781116aadb79a4c2e952c.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2017
60
2
Effect of Acetamide Derivative and its Mn-Complex as Corrosion Inhibitor for Mild Steel in sulphuric Acid
Omnia
El-Sayed Shehata
Novel hydrazone ligand N-(4-(2-hydrazinyl-2-oxoethoxy) phenyl)-acetamide [HL] and its metal complex of manganese (II) [Mn-HL] were investigated as corrosion inhibitors for mild steel in diluted sulphuric acid solution at 25 + 1oC using three electrochemical methods which show matching in results of three electrochemical techniques; potentiodynamic polarization, cyclic voltammetry & electrochemical impedance spectroscopy techniques. The experimental results clarify the inhibitive effect of N-(4-(2-hydrazinyl-2-oxoethoxy) phenyl) acetamide [HL] and its Mn (II) complex on mild steel that increase in presence of the complex [Mn-HL] more than [HL] where The ligand displayed low efficiencies as corrosion inhibitors against localized corrosion while complex give more efficiency corrosion inhibition. Detailed study effect of 0.1M sulphuic acid with and without ligand and its complex ligand MnCl2 on mild steel shown by Surface morphology of specimen using scanning electron microscope (SEM) and energy dispersive X-ray (EDX) analysis that show improvement appears in surface morphology in surface of mild steel with complex of ligand from localized attack to general attack (homogeneous surface and protective film).
acetamide derivative
sulphuric acid
mild steel
Cyclic voltammetry
EDX
2017
04
30
243
259
https://ejchem.journals.ekb.eg/article_1614_a7fe720b70151895138fd83816baef85.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2017
60
2
Physicomechanical Properties of Nano Polystyrene Nanocomposites
PREPARATION of nano metal oxides (Fe2O3, ZnO and TiO2) and nano …… sphere polystyrene (PS) has been done in micellar solution. Nanocomposite films have been prepared by doping nano polystyrene with different ratios of nano metal oxide ranged from 0.25 up to 3 wt%. These nanocomposites were characterized using transmission electron microscopy (TEM), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR).Thermo gravimetric analysis (TGA) and mechanical properties have also been investigated. By comparison with the values obtained for the PS, it was observed that the thermal stability is higher for the nanocompoistes and increases with increasing the nano metal oxides concentration in these samples. The results indicate that the tensile strength, elongation at break and Young’s modulus of all the nanocomposites enhanced with the addition of metal oxides nanoparticles compared with the pure PS.
polystyrene
Nanocompoistes
Nano metal oxides
Thermal stability
Mechanical Properties
2017
04
30
261
276
https://ejchem.journals.ekb.eg/article_2928_f8a874425b266076c8ab991b28873919.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2017
60
2
Synthesis, Characterization and Antimicrobial Evaluation of New cis-Bicyclo [3.3.0] octane-3,7- dione Derivatives
Octanedione
Phosphorus reagents
antimicrobial activity
2017
04
30
277
289
https://ejchem.journals.ekb.eg/article_2929_5a4cc86aefe183bf699a035d1e0bc896.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2017
60
2
Catalytic Cracking of Vegetable Oils for Producing Biofuel
CASTOR oil as well as used cooking oil have been catalytically cracked using three types of catalysts being zinc chloride, sodium carbonate and calcium oxide and the products of cracking were tested for their chemical and physical properties relevant to their use as fuels. Products obtained by cracking castor oil were found to be more suitable as bio-kerosene while those obtained by catalytic cracking of used cooking oil were more suitable as biodiesel. Therefore, the product obtained by catalytic cracking of used cooking oil has been then tested for its effect on the performance of a diesel engine compared to regular diesel fuel. Blends of catalytically cracked used cooking oil with regular diesel fuel were used for running the engine at different engine loading and the specific fuel consumption as well as the exhaust temperature had been determined at each load. The results have shown that blending of regular diesel fuel with catalytically cracked oil resulted in a reduction in the thermal efficiency compared to that if the engine was run using regular diesel fuel only .Such blending resulted also an increase in the exhaust temperature.
biofuel
Biodiesel
Bio-kerosene
Diesel Engine
vegetable oils
2017
04
30
291
300
https://ejchem.journals.ekb.eg/article_2967_a2306eb31a06b44526d68e92c85fc15b.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2017
60
2
Preparation and Reactions of Certain Racemic and Optically Active Cyanohydrins Derived from 2-Chlorobenzaldehyde, 4-Fluorobenzaldehyde, Benzo[d][1,3]-dioxole-5-carbaldehyde and 2,3-Dihydrobenzo[b][1,4]dioxine-6-carbaldehyde. Antimicrobial and in vitro Antitumor Evaluation of the Products
THE CHEMOENZYMATIC reaction of selected aldehydes, ……...namely 2-chlorobenzaldehyde (1a), 4-fluorobenzaldehyde (1b), benzo[d][1,3]dioxole-5-carbaldehyde (1c) and/or 2,3-dihydrobenzo [b] [1,4] dioxine-6-carbaldehyde (1d) with hydrogen cyanide in presence of (R)-oxynitrilase (R)-Pa HNL [EC 4.1.2.10] from almonds, as a chiral catalyst, gave the optically active cyanohydrin enantiomers (R)-2a-c, respectively. Acetone cyanohydrin (3), was also used, as a transcyanating agent, to give the same products. The racemic cyanohydrins (R,S)-2a-d have been synthesized, as well, by treating compounds 1a-d with aqueous potassium cyanide solution in presence of a saturated solution of sodium metabisulphite (Na2S2O5). The optical purity of cyanohydrins (R)-2a-c was determined through their derivatization with (S)-naproxen chloride (S)-5 to the respective diastereomers (R,2S)-6a-c which were obtained in diastereomeric excess (de) values up to 93 % (1H NMR). Heating compounds (R)-2a,b and / or their racemic analogues (R,S)-2a-c with concentrated hydrochloric acid gave the respective α-hydroxycarboxylic acids 7a-c. Moreover, reduction of cyanohydrins (R,S)-2b,c under different conditions resulted in a hydrodecyanation giving the respective primary alcohols 8a,b. Structures and configurations of the new compounds were confirmed with compatible elementary microanalyses and spectroscopic ( IR, 1H NMR, 13C NMR, MS and single crystal X-ray crystallography) measurements. The antimicrobial activity of derivatives 6a-d against four bacterial species (Bacillus subtilis, Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa) and two fungi (Aspergillus flavus and Candida albicans) were undertaken. Moreover, compounds (R,2S)-6b, (R,2S)(S,2S)-6b and (R,2S)−6c were screened for their in virto antitumor activity against three human solid cancer cell lines (HCT 116, HepG2 and MCF-7). In general, the tested compounds were found inactive or showed weak activities in comparison with the standard drugs.
Cyanohydrins
Chemoenzymatic synthesis
Reduction
Single crystal X-ray crystallography
Stereochemistry
antimicrobial activity
Anticancer activity
2017
04
30
301
328
https://ejchem.journals.ekb.eg/article_3262_091701fb30c0761266b2e70319457e38.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2017
60
2
Structural and Catalytic Properties of Sulphated Zirconia doped by Zn Oxide
SULFATED zirconia (SZ) and zinc supported sulfated ……zirconia (Zn/SZ) catalysts were synthesized, characterized and evaluated by coumarin synthesis reaction. The reaction was carried by reacting resorcinol and ethyl acetoacetate with a molar ratio 1:2 respectively. The investigated SZ and Zn/SZ catalysts were prepared by the simple impregnation method with an aqueous solution of H2SO4 as a precipitating agent, followed by drying in rotary and finally calcined at 600 oC for 3 hrs. The physicochemical properties of the investigated catalysts were characterized by the x-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM) and potentiometric titration to characterize the number and the strength of the acid sites. The 6%Zn/SZ catalyst possessed the maximum catalytic activity as well the number of acid sites. Increase of the tetragonal phase content in ZrO2 increases the catalytic activity.
Sulfated zirconia
Impregnation method
coumarine synthesis reaction and potentiometric titration
2017
04
01
329
345
https://ejchem.journals.ekb.eg/article_3288_51017052f21a7c770eeb96a8f90bfb50.pdf