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Hayam A. Abd El Salam,Mohamed S. Abdel‑Aziz,Eslam Reda El‑Sawy,Elkhabiry Shaban 한국섬유공학회 2023 Fibers and polymers Vol.24 No.8
For conjugating sulfa drug moieties with Schiff’s bases scaffold in the same build through an azo linker to take advantage of the bioactive feature of both motifs, we designed and synthesized a series of bioactive disperse dyes. The target disperse dyes, methyl 2-(E-2-hydroxy-5-((E)-(4-sulfa-derivative) diazenyl)benzylidene) hydrazine-1-carbodithioates 4a–e have been synthesized via the acidic reaction of azo dyes 3a–e with methyl hydrazine carbodithioate. Structures of the synthesized dyes were clarified based on their spectral and elemental analyses. The effectiveness of the dyes was initially tested as an antibacterial toward Staphylococcus aureus ATCC 6538-P and Escherichia coli ATCC 25933. Dyes that were proven to be effective against bacteria have been used as disperse dyes to print polyester fabrics. The color properties of the dyes and their fastness properties counting washing, perspiration, light, rubbing, and sublimation fastness were also examined. The printed polyester fabrics were evaluated for their antibacterial activity via colony-forming unit (CFU) technique. Fabric samples treated with 4c, 4d, and 4b had promising anti-Gram-positive activities against S. aureus. Whereas 4c-, 4d-, and 4b-treated fabrics exhibited moderate anti-Gram-negative activities against the test bacterium E. coli.
S. M. Iqbal S. Zainal,Farzad Hejazi,Farah Nora Aznieta Abd. Aziz,Mohd Saleh Jaafar 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.1
The use of fibers in cement composites has been shown to improve the mechanical properties of concrete through the fiber-bridging effect, which implies the fiber’s crack-resisting property. Additionally, the combination of two or more different fibers in the concrete mixture yielded better strength than the individual fibers due to its more versatile applications. Therefore, this study was conducted to investigate the combination of multiple synthetic fibers to improve the concrete residual strength and evaluate the hybridization synergistic effect. Ferro macro-sized fiber (FF) as the primary load-bearing fiber and four different secondary synthetic microfibers comprising Ultra-Net (UN), Super-Net (SN), Econo-Net (EN), and Nylo-Mono (NM) were utilized to develop a total of 16 hybrid fiber reinforced concrete (HyFRC) combinations and the performance were compared against their single-fiber counterpart. The tensile strength, bonding power, physical form, length, and volume fraction of the fibers were measured under the ASTM C1399 test standard in order to calculate the average residual strength (ARS) of concrete in the post-cracking region as well as to assess the synergistic effect of the fiber combination. The results recorded positive fiber synergy for all specimens tested. In addition, the Ferro-Nylo, Ferro-Super, Ferro-Econo, and Ferro-Ultra hybrids improved the ARS compared to the controlled specimens by 20.41, 10.2, 7.48, and 6.12%, respectively.
Fouda, Abd El-Aziz S.,Nazeer, Ahmed Abdel,El-Khateeb, Ayman Y.,Fakih, Mohamed Korean Chemical Society 2014 대한화학회지 Vol.58 No.4
The inhibition effect of cinnamon plant extract as a green corrosion inhibitor for steel in sulfide polluted salt water was studied by potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), and electrochemical frequency modulation (EFM). The results showed that cinnamon plant extract in sulfide polluted salt water is a good corrosion inhibitor with inhibition efficiency reached to 80% at 250 ppm of the plant extract. The adsorption of cinnamon obeys Temkin adsorption isotherm, and acts as a mixed-type of inhibitor but dominantly as a cathodic inhibitor in sulfide polluted salt water.
Fouda, Abd El-Aziz. S.,Rashwan, Salah M.,Abo-Mosallam, Hytham A. Korean Chemical Society 2014 대한화학회지 Vol.58 No.1
Corrosion inhibition of 304 stainless steel (SS) in 1 M HCl by aqueous extract of coriander seeds was studied using weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and electrochemical frequency modulation (EFM) techniques. Values of inhibition efficiency obtained are dependent upon the concentration of extract and temperature. Generally, inhibition was found to increase with inhibitor concentration, but decrease with temperature. Physical adsorption mechanism has been proposed for the inhibition with Langmuir adsorption isotherm obeyed. Values of activation energy of the inhibited corrosion reaction of 304 SS are greater than the value obtained for the blank. Thermodynamic consideration reveals that adsorption of aqueous extract of coriander seeds 304 SS surface is spontaneous.
Fouda, Abd El-Aziz S.,Nazeer, Ahmed Abdel,Saber, Ahmed Korean Chemical Society 2014 대한화학회지 Vol.58 No.2
The electrochemical behavior and corrosion inhibition of zinc in 0.5 M $H_2SO_4$ in the absence and presence of some chromones has been investigated using weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and electrochemical frequency modulation (EFM) techniques. The presence of these investigated compounds in the corrosive solutions decrease the weight loss, the corrosion current density, and double layer capacitance but increases the charge transfer resistance. Polarization studies were carried out at room temperature, and showed that all the studied compounds act as mixed type inhibitors with a slight predominance of cathodic character. The effect of temperature on corrosion inhibition has been studied and the thermodynamic activation and adsorption parameters were determined and discussed. The adsorption of the investigated compounds on zinc was found to obey Langmuir adsorption isotherm.
Extract of Camellia sinensis as Green Inhibitor for the Corrosion of Mild Steel in Aqueous Solution
Fouda, Abd El-Aziz S.,Mekkia, Dina,Badr, Abeer H. Korean Chemical Society 2013 대한화학회지 Vol.57 No.2
Corrosion inhibition of mild steel used in water station in 35 ppm aluminum sulfate and 10 ppm chloride solution by Camellia sinensis leaves extract was studied using weight loss, potentiodynamic polarization and electrochemical impedance spectroscopy techniques at $30^{\circ}C$. Results show that the inhibition efficiency increases with increasing concentration of the extract and decreases with increasing temperature. Inhibitive effect was afforded by adsorption of the extract's components which was found to accord with Langmuir adsorption isotherm. Inhibition mechanism is deduced from the temperature dependence of the inhibition efficiency and was further corroborated by the values of activation parameters obtained from the experimental data.
Ginger Extract as Green Corrosion Inhibitor for Steel in Sulfide Polluted Salt Water
Fouda, Abd El-Aziz S.,Nazeer, Ahmed Abdel,Ibrahim, Mohamed,Fakih, Mohamed Korean Chemical Society 2013 대한화학회지 Vol.57 No.2
Extract of ginger has been evaluated as a green inhibitor for the corrosion of steel in sulfide polluted NaCl solution using potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and electrochemical frequency modulation (EFM) techniques. Potentiodynamic polarization measurements showed that this extract acts as a mixed type inhibitor but mainly inhibits the cathodic reaction. The inhibition efficiency was found to increase with inhibitor concentration reaching to approximately 83.9% using 250 ppm of ginger. Nyquist plots show a single capacitive loop in uninhibited and inhibited solutions. From EFM the causality factors are very close to theoretical values which indicate that the measured data are of good quality. The adsorption process of the studied extract on steel surface obeys Temkin adsorption isotherm. The results obtained from the different electrochemical techniques were in good agreement which prove the validity of these tools in measurement of corrosion rate. Ginger extract has no effect on Escherichia Coli and can be applied safely on waste water treatment plants.