Search results for: Shymaa S. Medany

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article

Enhanced electrocatalytic activity of graphitic carbon nitride‐supported Ni/NiO microflower structures for urea electro‐oxidation

Mohamed Taha, Yasser A. Attia, Shymaa S. Medany

Journal of Chemical Technology & Biotechnology > 99 > 2 > 509 - 521

BACKGROUND In this study, a 3D heterostructure of Ni/NiO microflower‐decorated graphitic carbon nitride (g‐C₃N₄) with different ratios was synthesized using the hydrothermal method. The aim was to investigate the electrocatalytic activity of these materials toward urea electrochemical oxidation (UEO) and compare them with various Ni‐based catalysts in NaOH solution. RESULTS The crystal structure...

article

The double‐edged sword of the amoxicillin antibiotic against prostate cancer in nano palladium form and its electrochemical detection of dopamine

Safaa S. Hassan, Demiana H. Hanna, Shymaa S. Medany

Applied Organometallic Chemistry > 37 > 4 > n/a - n/a

Pd (II) complex was prepared from the interaction with Schiff base based on the condensation amoxicillin trihydrate drug and 4‐N,N‐dimethylaminobenzaldehyde. The complex was prepared on the nanoscale that was investigated using transmission electron microscopy (TEM). The chemical structure of the synthesized Schiff base and its Pd (II) chelate was proved through several techniques. Assays using MTT...

article

Phytochemicals of mustard (Brassica Campestris) leaves tuned the nickel‐cobalt bimetallic oxide properties for enzyme‐free sensing of glucose

Abdul Ghaffar Solangi, Tajness Pirzada, Aqeel Ahmed Shah, Imran Ali Halepoto, more

Journal of the Chinese Chemical Society > 69 > 9 > 1608 - 1618

The fabrication of enzyme‐free glucose sensors is highly demanded for the biological, clinical, and food applications. In this study, we have developed a green method for tuning the surface properties of nickel‐cobalt bimetallic oxide (NiCo₂O₄) by adding mustard (Brassica Campestris) leaves extract during hydrothermal growth. The mustard (Brassica Campestris) leaves extract is rich with a variety...

article

Sensitive nitrite detection at core-shell structured Cu@Pt nanoparticles supported on graphene

R.M. Abdel Hameed, Shymaa S. Medany

Applied Surface Science > 2018 > 458 > C > 252-263

Although nitrite is a carcinogenic material, it is widely used in food preservation. Accordingly, suitable electroanalytical tools are necessary to estimate nitrite ions concentration. In this work, core-shell structured Cu@Pt nanoparticles supported on graphene [Cu@Pt/Gr] were developed in simple two-step route through ethylene glycol as a reducing agent. The fabricated nanomaterial was characterized...

article

Influence of support material on the electrocatalytic activity of nickel oxide nanoparticles for urea electro-oxidation reaction

R.M. Abdel Hameed, Shymaa S. Medany

Journal of Colloid and Interface Science > 2018 > 513 > C > 536-548

Nickel oxide nanoparticles were deposited on different carbon supports including activated Vulcan XC-72R carbon black (NiO/AC), multi-walled carbon nanotubes (NiO/MWCNTs), graphene (NiO/Gr) and graphite (NiO/Gt) through precipitation step followed by calcination at 400 °C. To determine the crystalline structure and morphology of prepared electrocatalysts, X-ray diffraction (XRD) and transmission electron...

article

NiO nanoparticles on graphene nanosheets at different calcination temperatures as effective electrocatalysts for urea electro-oxidation in alkaline medium

R.M. Abdel Hameed, Shymaa S. Medany

Journal of Colloid and Interface Science > 2017 > 508 > C > 291-302

NiO nanoparticles were supported on graphene nanosheets (NiO/Gr) through coprecipitation step of Ni(OH)₂ species, followed by calcination at different temperature values. The formed nanocomposites were characterized by employing X-ray diffraction (XRD) and transmission electron microscopy (TEM) to investigate their crystalline structure and morphology. The effect of varying the calcination temperature...

article

Enhanced electrocatalytic activity of NiO nanoparticles supported on graphite planes towards urea electro-oxidation in NaOH solution

R.M. Abdel Hameed, Shymaa S. Medany

International Journal of Hydrogen Energy > 2017 > 42 > 38 > 24117- 24130

Nickel oxide nanoparticles are fabricated onto graphite planes [NiO/Gt] by chemical precipitation of Ni(OH)₂ particles with consecutive calcination at 400 °C. The formed electrocatalysts are characterized using X-ray diffraction (XRD) and Transmission electron microscopy (TEM). TEM images demonstrate the deposition of NiO nanoparticles on graphite surface through their crystallite lattice fringes...

article

Kinetics of the electropolymerization of aminoanthraquinone from aqueous solutions and analytical applications of the polymer film

Shymaa S. Medany, Khaled M. Ismail, Waheed A. Badawy

Journal of Advanced Research > 2012 > 3 > 3 > 261-268

Poly 1-amino-9, 10-anthraquinone (PAAQ) films were prepared by the electropolymerization of 1-amino-9,10-anthraquinone (AAQ) on platinum substrate from aqueous media, where 5.0×10 ⁻³ molL ⁻¹ AAQ and 6.0molL ⁻¹ H ₂ SO ₄ were used. The kinetics of the electropolymerization process was investigated by determining the change of the charge consumed during the polymerization...

article

Poly(2‐aminobiphenyl), preparation, characterization, mechanism, and kinetics of the electropolymerization process

Waheed A. Badawy, Khaled M. Ismail, Ziad M. Khalifa, Shymaa S. Medany

Journal of Applied Polymer Science > 125 > 5 > 3410 - 3418

Electropolymerization of 2‐aminobiphenyl was carried out on glassy carbon, gold, and platinum electrodes, in aqueous–organic solvent mixtures, using a potentiodynamic technique. The choice of organic solvent strongly influences the film formation. In a mixture of 60% acetonitrile and 40% 1.0M HClO₄, stable films were obtained. The poly(2‐aminobiphenyl) films were characterized with cyclic voltammetry,...

article

Kinetics of electropolymerization of 1‐amino‐9,10‐anthraquinone

Waheed A. Badawy, Khaled M. Ismail, Shymaa S. Medany

International Journal of Chemical Kinetics > 43 > 3 > 141 - 146

1‐Amino‐9,10‐anthraquinone was electropolymerized on platinum substrates either from aqueous or nonaqueous electrolytes. The aqueous electrolyte was 6.0 mol L⁻¹ H₂SO₄, and the nonaqueous solvent was acetonitrile containing lithium perchlorate, LiClO₄, as a supporting electrolyte. The formed polyaminoanthraquinone was stable, and the polymerization process was reproducible. The kinetics of the electropolymerization...

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Keywords

UREA (3)
ALKALINE MEDIUM (2)
ELECTRO-OXIDATION (2)
ELECTROCATALYST (2)
NICKEL OXIDE (2)
3D‐HETEROSTRUCTURE (1)
AMOXICILLIN (1)
APOPTOSIS (1)
ASCORBIC ACID (1)
BIOSENSOR (1)
CALCINATION TEMPERATURE (1)
CARBON SUPPORT (1)
CATECHOL (1)
CONDUCTING POLYMERS (1)
CORE-SHELL STRUCTURE (1)
CYCLIC VOLTAMMETRY (1)
DETECTION LIMIT (1)
DOPAMINE (1)
DOPAMINE DETECTION (1)
ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY (1)
ENERGY CONVERSION (1)
ENZYME‐FREE GLUCOSE SENSOR (1)
GLUCOSE OXIDATION (1)
GRAPHITE (1)
GRAPHITIC CARBON NITRIDE (1)
HYDROQUINONE (1)
HYDROTHERMAL METHOD (1)
MUSTARD LEAVES EXTRACT (1)
NANO‐PALLADIUM COMPOUND (1)
NICKEL/NICKEL OXIDE MICROFLOWER (1)
NICO2O4 NANOSTRUCTURES (1)
NIO (1)
POLY(2‐AMINOBIPHENYL) (1)
POLYAMINOANTHRAQUINONE (1)
POLYMERIZATION (1)
REAL SAMPLES (1)
ROS INDUCTION (1)
SELECTIVITY (1)
UREA ELECTRO‐OXIDATION (1)
UREA FUEL CELLS (1)
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