2024-03-29T01:43:41Z
https://ejchem.journals.ekb.eg/?_action=export&rf=summon&issue=326
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2016
59
6
Novel Recycled Brown Paper Coatings
CURRENTLY, styrene acrylate copolymers have highly been employed in paper coating application. In sequence to contribute to the green environment approach, different styrene acrylate copolymers with different pigment percentages were formulated and applied on recycled brown base paper in order to determine the most efficient coating. The study also investigated the applicability of Egyptian ground calcium carbonates in paper coating as an alternative of the traditional imported kaolin pigment. The effect of such binders on mechanical properties; water absorbency ”Cobb60”; air permeability of paper; gloss and printability of coated paper was explored. The water absorption of coated papers was 30gm/m2 compared with 35gm/m2 for the commercial one. This means that ink consumption can be decreased by ≈30% in concert with the possibility of usage of low viscous ink. Gloss of coated papers was upgraded to more than double that of base ones. The burst strength; ring crush and the tensile strength for the coated papers were simultaneously improved compared with the commercial ones. The printability of coated papers was as well superior to the commercial one; this can evidently reduce the economical cost of the printing process.
Recycled brown base paper
Paper coating
Styrene acrylate binders
packaging
Printability
Offset printing
2016
12
31
935
953
https://ejchem.journals.ekb.eg/article_1542_b11d79c5b5aaecc6e139528feffeb249.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2016
59
6
Preparation of Photoactive Tungsten-doped Anatase Nanotubes Using Hydrothermal Technique
TITANIA (TiO2) and tungsten doped titania (W-TiO2) nanoshpheres were prepared by sol-gel method, while tungsten doped titania nanotubes was formed by hydrothermal process. The structure and the morphology of the prepared photocatalysts have been characterized using X-ray diffraction (XRD) and high resolution transmission electron microscope (HRTEM) techniques, respectively. XRD results of the W-TiO2 powder, prepared by the sol - gel method and hydrothermal method showed that anatase structure was formed. HRTEM images illustrate that the average diameter of the as-synthesized W-TiO2 nanosphers was about 70 nm and the nanotubes have an outer diameter ranging from 8 to 10 nm and inner diameter of 2 to 3 nm and a length of few hundreds of nanometers. The photocatalytic performance of the prepared photocatalysts was studied through the degradation of acid orange dye (AO7). Higher efficiency for degradation of AO7 was obtained using W-TiO2 NT compared with TiO2 and W-TiO2 nano-powders. The results show that the dye removal was 99.88, 95.00 and 81.00 %within 60 minutes in the case of using W-TiO2 NT, W-TiO2 nanospheres and TiO2 nanospheres, respectively and the absorption edge shifts toward visible light region for both- TiO2 nano-powders and NT.
hydrothermal
sol-gel
nanotubes
Titanium dioxide
Tungsten doped titania
2016
12
31
955
966
https://ejchem.journals.ekb.eg/article_1543_4c485961f0cad755dd2e9e3eae72880b.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2016
59
6
Synthesis and Antitumor Activity Evaluation of New 2-(4-aminophenyl) benzothiazole/oxazole/imidazole Derivatives
A NEW series of 2-(4-aminophenyl)benzothiazole and related structure compounds, bearing thiocyanate, thiol in the 3'postion as well as new condensed benzothiazoles and related structure compounds having thiazolones ,tetrazole, oxadiazole have been synthesized . All the newly synthesized compounds were screened for their anti-tumor activities. The results revealed promising effects against most of the cancer cell lines.
2-(4 aminophenyl) benzothiazole/ benzoxazole/ benzimidazole
Tetrazole
Oxadiazole
thiazole
Oxobutanoate
Tolyiformamidine
Chlorophenyl-formamidine
anticancer agent
2016
12
31
967
984
https://ejchem.journals.ekb.eg/article_1544_390e482d39d46eb6ceeafcf98c16eaac.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2016
59
6
Sequence of Crystallization and Characterization of Bi2O3-CaO-CuO Ternary System
VIA melt-quenching route, crystallization in the ternary Bi2O3-CaO-CuO glass was studied. The preparation of six samples within the ternary triangle gave two glasses and four devitrified glasses. The thermal effect pointed to softening and crystallization temperatures between 290°C and 422 °C and between 360°C and 550 °C, respectively. The crystallized phases within the former heat-treatment were mixed oxides of bismuth, copper and calcium; however its ratios in oxide formula were different according to the composition. The microstructure of the devitrified samples show heterogenous crystallization in residual glass containing nano-scale crystals however, in the glassy samples scattered clusters containing more nano-scale crystals in glassy groundmass.
glass
dvitrified
Crystallization and Bi-containing oxide phases
2016
12
01
985
999
https://ejchem.journals.ekb.eg/article_1545_eb3d92095657ded8c7ce88ef02cc5933.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2016
59
6
Synthesis and Characterization of N-(2-acetylthiophene) salicylideneimine (ATS) as Ionophore for Polymeric Membrane Ag (I) Selective Electrode
A NOVEL silver ion selective membrane electrode which was based on a newly synthesized N-(2-acetylthiophene)salicylicdeneimine (ATS) by the reaction of 2-acetyl thiophene with 2-aminophenol at 60ºC in ethanol by using ultrasound irradiation. ATS was characterized by elemental analyses, FTIR, MS and 1H-NMR.The best performance was obtained for the membrane of composition (ATS): PVC: DOS in the ratio 1:33:66 wt %. The sensor shows a linear potential response for Ag+ over a wide concentration range 6.0 x 10-8 -1.0 x 10-1 M and detection limit 4.36 x10-8 with Nernstian slope (57.93 mV decade-1 of activity) between a wide pH range (3.0-10) and a fast response time of 10s. The selectivity coefficient values were calculated with separate solution method, which indicate good selectivity of Ag+ ion. The sensor has a lifetime of five weeks and could be used as an indicator electrode in the potentiometric titration of Ag+ vs. stander solution of NaCl and in the estimation of Ag+ in photographic solutions and medical X-ray samples.
Poly vinyl chloride (PVC)
N-(2-acetylthiophene) salicylideneimine (ATS)
Silver selective sensor and Nernstian slope
2016
12
31
1001
1012
https://ejchem.journals.ekb.eg/article_1546_bd761077bb832da1bbe75376b5c93a70.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2016
59
6
Comparative Electrical Studies of Lithium and Lithium Free-Phthalocyanine Complexes
HYBRID inorganic-organic nanocomposite materials have ……various electrical and mechanical properties that make them used in many applications in areas of the electronic industry and have played as insulators and dielectrics. Conducting and semiconducting properties have stimulated their use in many novel applications. Among them new symmetrical Lithium phthalocyanine with different lithium concentrations were synthesized by urea fusion technique and characterized through the study of FTIR, and UV-visible spectra. The dielectric properties such as dielectric constant (ɛ`) and dielectric loss (ɛ``) were studied for metal free phthalocyanine and Lithium phthalocyanine complexes with different concentration of lithium ions namely 0.01, 0.03 and 0.06 M. The studies were carried out at frequency range 100Hz-1MHz and within temperature range (280-440 K). It was observed that the dielectric constant of phthalocyanine complexes decrease with the increase of frequency and increase with increasing temperature signifying the semiconducting property. The decrease in energy gap with the coordination of metal ion suggests that the metal ion plays an important role in the electronic properties of the complexes.
Phthalocyanine
Lithium
Dielectric constant
IR and UV
2016
12
31
1013
1027
https://ejchem.journals.ekb.eg/article_1549_8db741bda24ace3ac953bbf7e86dc65a.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2016
59
6
Influence of Mechanical Milling on the Surface and Morphological Properties of Nanoparticle Molybdenum Disulfide
SYNTHESIS of nested nanoscale 2H-MoS2 partially ordered layers, through grinding technique, is reported. High surface area of molybdenum disulfide was produced and located in mesoscale, ranging between 14 - 125 m2/g. The samples were characterized and investigated by X-ray diffraction, nitrogen adsorption at - 196 oC, scanning electron microscopy (SEM) and transmission electron microscopy (TEM) techniques. The reduction in crystallinity is directly proportional to the grinding time. Grinding was demonstrated to be an effective physical technique for monitoring the crystallite sizes. It mostly affects the number of the stacked MoS2 layers but not the slab lengths. The nitrogen adsorption-desorption isotherms measured were interpreted and analyzed by application of BET equation as well as both αs- and t- methods for surface area calculations. It was discovered that the increase in grinding time led to a decrease in the crystallite sizes, simultaneously, accompanied by a sharp increase in the surface area of the investigated solids.
TEM, SEM, XRD
SBET, MoS2, nanostructure and milling
2016
12
31
1029
1044
https://ejchem.journals.ekb.eg/article_1550_8dc486bf4f5c83af7f143f6c98cf229e.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2016
59
6
Production of Biodiesel Production from Castor Oil Using Modified Montmorillonite Clay
IN THIS study, castor oil was used to produce biodiesel via ……. transesterification reaction in present of methanol. The reaction was performed using novel modified montmorillonite catalyst (heterogeneous catalyst). The prepared catalysts were characterized by the HR-TEM, XRD, IR, and N2-adsorption. The transesterification reaction was carried out using different oil /methanol molar ratios (1:3), (1:6), (1:9), and (1:12). Various amounts of catalyst were used ranged from 1 to 7 wt.% and reaction time from 1 to 5 hr in temperature range of 40 to 70°C. The optimized conditions of the transesterification reaction of castor oil were pointed at 12:1 methanol to oil molar ratio and 5 wt.% catalyst at 60 °C for 5 hr. The catalyst was reusable for 7 times. The fuels produced were characterized and found to have closed properties to conventional petroleum diesel.
2016
12
31
1045
1060
https://ejchem.journals.ekb.eg/article_1551_7e306aa17bddbe06a1b8462a5106a315.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2016
59
6
Synthesis and Characterization of Multi-Walled Carbon Nanotubes Decorated ZnO Nanocomposite
MULTI-WALLED carbon nanotubes decorated Zinc oxide ..........(MWCNTs/ZnO) nanocomposites with ratio of (99: 1 wt %) was prepared using sol gel method. Transmission Electron Microscope (TEM) and The X-ray diffraction pattern (XRD) showed that the MWCNTs/ZnO nanocomposites was synthesized with particle size ranging from 2-7 nm and crystalline size about 7nm. The Field Emission Scanning Electron Microscopy (FESEM) images demonstrate that ZnO had grown on the walls of MWCNTs were uniformed layer in the shape of thin film layer of nanospheres covering the surface of the tubes, also the energy dispersive X-ray spectrum (EDX) and Fourier Transformed Infrared spectroscopy (FTIR) prove the presence of ZnO without any impurities
MWCNT
MWCNTs/ZnO nanocomposites and Sol gel method
2016
12
31
1061
1068
https://ejchem.journals.ekb.eg/article_1552_17ae1bacb8c3cec551e34d9085bdafb9.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2016
59
6
Spectral Evaluation Studies on Titanium Dioxide Nano-Particles and Their Add-mixtures on Textile Fabrics
Saher F. Ibrahim*, Dalia. M. Essa and Eman M. Osman National Institute for Standards, Tersa st. Elharam, Giza, Egypt. THIS article aims to study the effect of the treatment of different textile fabrics: wool, polyester, and blend wool/polyester with nano-titanium dioxide. Where, nano-TIO2 used in the valid and safe concentrations range in accordance with many environmental legislations, in water dispersions matrices containing poly ethylene glycol (PEG) as a wetting agent and hydroxyl ethyl cellulose (HEC) as a thickening agent. FTIR spectral analysis, the UV-blocking performance, anti-bacterial activity, conductance measurement, electron spin resonance and air permeability were the techniques for characterization. The results obtained showed excellent anti-ultraviolet performance and improved antibacterial activity. The results of electrical characteristics verified a reduction percentage in the ohmic resistance of the treated fabrics indicating fabrics with improved electrical character. Also, the ESR results confirmed more surface activation of the modified fabrics. These modified fabrics with improved UV protection properties, antibacterial activity and electrical characteristics may referred so as called cosmetic and smart textiles.
Nano-TiO2
fabrics
Treatment
Conductance measurement
UV
Blocking
FTIR
Electron spin resonance and Air permeability
2016
12
30
1069
1093
https://ejchem.journals.ekb.eg/article_1547_51b27d8f53cdc155cfbf74cd65ad975c.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2016
59
6
Evaluation of Functional and Comfort Properties of SA/TDI/PEG1000 Adduct Treated Cotton/ Polyester Blended Fabric
THE SA/TDI/PEG1000 adduct was synthesized by reacting a mixture of stearyl alcohol (SA) and polyethylene glycol (PEG) of molecular weight 400, 1000, 2000, or 6000 Dalton with 2,4-toluene diisocyanate (TDI). The prepared adduct emulsion was incorporated in different easy care finishing formulations to illustrate the impact of that adduct emulsion on the performance, functional and comfort properties of treated cotton/polyester fabric. Among five salts namely ammonium sulphate, magnesium chloride, zinc sulphate, copper sulphate and ammonium chloride examined as catalysts for the aforementioned finishing formulations, ammonium sulphate with a concentration of 6 g/l was the unique catalyst that imparts treated fabric with significant durable functional properties. Furthermore, increasing of the adduct concentration in the finishing bath results in an increase in fabric weight, tensile strength, softness, stiffness, water repellency, antibacterial, water vapor resistance and thermal resistance properties of treated fabric along with a reduction in resiliency and air permeability properties of that fabric. On the other hand, inclusion Ag or TiO2 nano-particles (NPs) in easy care finishing baths containing the SA/TDI/PEG1000 adduct emulsion effectively upgrades the antibacterial properties along with a slight reduction in the water repellency of treated fabric. Furthermore, the morphology of prepared Ag- or TiO2-NPs was characterized via their TEM images. Meanwhile, fabric samples treated with SA/TDI/PEG1000 composites containing such NPs were characterized via their SEM and EDXimages as well as TGA analysis.
2016
12
30
1095
1111
https://ejchem.journals.ekb.eg/article_1548_345e08b59bc3c4d0a3af4d7d73ea7228.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2016
59
6
Quantification of The Light Fastness of Colored Substrates by Applying Fading Rate Constant Values
V ISUAL assessment of light fastness of colored substrates …….against the Standard Blue Scale is considerably not accurate due to the difficulties in the differentiation between small color changes either at lower or higher shades. In this work, nylon fabric and polyamide films (PA) samples , and cellulose diacetate (CDA) films were dyed with different disperse dye concentrations, also wool, viscose and unmodified and modified cotton samples were dyed with reactive dye at same concentrations. The dyed samples were exposed to artificial day light for various periods (20-160 hours) were examined. Color strength, the light fastness and the fading rate constant (K) of these samples were evaluated. It was concluded that for a series of dye concentrations, same light fastness rating were observed and/or with an appreciable change. Since 'K' is a concentration dependent, it decreases by increasing the dye concentration and at each dye concentration a definite 'K' value was obtained. Also, direct relation was found to exist between light fastness rating values and 'K' values. For each light fastness rating of the Standard Blue Scale, there exist a range of 'K' values. Thus, low 'K' values showed high light fastness of the order (7). K values are precise and more accurate and reflect the real change in the light fastness of colored textiles . Keywords: Colored textile, Blue scales, Light fastness, Fading rate constant, Reactive dye, Disperse dye and Films.
Colored textile
Blue scales
Light fastness
Fading rate constant
Reactive dye
Disperse dye and Films
2016
12
30
1113
1125
https://ejchem.journals.ekb.eg/article_1556_51967d2ef4e1d6bf2c6e5006e71653c6.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2016
59
6
Proposed Corrosion Control Method for Fire Fighting Systems in Oil Fields
2016
12
30
1127
1135
https://ejchem.journals.ekb.eg/article_1557_b23d716535e56dc34fe0cde66a837c3f.pdf