Publications

Microwave Assisted Synthesis, Physicochemical, Photophysical, Single Crystal X-ray and DFT Studies of Novel Push–Pull Chromophores

Rapid, sensitive, and selective fluorescent DNA detection using iron-based metal–organic framework nanorods: Synergies of the metal center and organic linker

Dual nature, self oxidized poly(o-anisidine) functionalized multiwall carbon nanotubes composite: Preparation, thermal and electrical studies

Sol–gel synthesis of poly(o-toluidine)@Sn(II)silicate/CNT composites for ion selective membrane electrodes

Potential sustainable electrochemical corrosion inhibition study of Citrus limetta on mild steel surface in aggressive acidic media

Green corrosion inhibitors are of recent interest because of their cost-effectiveness, biodegradability, and eco-friendly characteristics. Plant extracts have been recognized as valuable resources for the corrosion inhibition of metallic alloys. Out of those, one of the most important properties is to exhibit excellent corrosion inhibition on metal surfaces. In the present paper, the corrosion inhibition efficiency of Citrus limetta, commonly known as Mosambi peel extract on mild steel surfaces in an acidic environment has been reported through investigation by some electrochemical methods such as weight loss, potentiodynamic polarization and electrochemical impedance. The investigated green inhibitor was found to exhibit corrosion inhibition efficiency of 93% on the mild steel surfaces in hydrochloric acid media. The adsorption mechanism of the peel extract on a mild steel surface was interpreted and it confirms there is a combination of both physisorption and chemisorption associated with the interaction between the Citrus limetta peel extract and mild steel surface. The extract was characterized using fourier infrared spectroscopy and scanning electron microscopy.

Sensitive 1,2-dichlorobenzene chemi-sensor development based on solvothermally prepared FeO/CdO nanocubes for environmental safety

Rectangular Coordination Polymer Nanoplates: Large-Scale, Rapid Synthesis and Their Application as a Fluorescent Sensing Platform for DNA Detection

In this paper, we report on the large-scale, rapid synthesis of uniform rectangular coordination polymer nanoplates (RCPNs) assembled from Cu(II) and 4,4'-bipyridine for the first time. We further demonstrate that such RCPNs can be used as a very effective fluorescent sensing platform for multiple DNA detection with a detection limit as low as 30 pM and a high selectivity down to single-base mismatch. The DNA detection is accomplished by the following two steps: (1) RCPN binds dye-labeled single-stranded DNA (ssDNA) probe, which brings dye and RCPN into close proximity, leading to fluorescence quenching; (2) Specific hybridization of the probe with its target generates a double-stranded DNA (dsDNA) which detaches from RCPN, leading to fluorescence recovery. It suggests that this sensing system can well discriminate complementary and mismatched DNA sequences. The exact mechanism of fluorescence quenching involved is elucidated experimentally and its use in a human blood serum system is also demonstrated successfully.

Nanohydroxyapatite Reinforced Chitosan Composite Hydrogel with Tunable Mechanical and Biological Properties for Cartilage Regeneration

With the continuous quest of developing hydrogel for cartilage regeneration with superior mechanobiological properties are still becoming a challenge. Chitosan (CS) hydrogels are the promising implant materials due to an analogous character of the soft tissue; however, their low mechanical strength and durability together with its lack of integrity with surrounding tissues hinder the load-bearing application. This can be solved by developing a composite chitosan hydrogel reinforced with Hydroxyapatite Nanorods (HANr). The objective of this work is to develop and characterize (physically, chemically, mechanically and biologically) the composite hydrogels loaded with different concentration of hydroxyapatite nanorod. The concentration of hydroxyapatite in the composite hydrogel was optimized and it was found that, reinforcement modifies the hydrogel network by promoting the secondary crosslinking. The compression strength could reach 1.62 ± 0.02 MPa with a significant deformation of 32% and exhibits time-dependent, rapid self-recoverable and fatigue resistant behavior based on the cyclic loading-unloading compression test. The storage modulus value can reach nearly 10 kPa which is needed for the proposed application. Besides, composite hydrogels show an excellent antimicrobial activity against Escherichia coli, Staphylococcus aureus bacteria's and Candida albicans fungi and their cytocompatibility towards L929 mouse fibroblasts provide a potential pathway to developing a composite hydrogel for cartilage regeneration.

Synthesis of a MnO₂ Nanosheet/Graphene Flake Composite and Its Application as a Supercapacitor having High Rate Capability

Mechanistic Investigation of Osmium(VIII) Catalyzed Oxidation of Glutamic Acid With Sodium Salt of N-Chloro 4-Methylbenzenesulfonamide in Aqueous Media: A Practical Approach

AbstractL-glutamic acid is used in the production of monosodium glutamate spices and other biochemical reagents. Its oxidation kinetics and a detailed mechanistic interaction of Os(VIII) catalyzed Glue-CAT reaction in alkaline medium have been investigated at different temperatures. It has been studied spectrophotometrically as a basic experimental approach for this study. All variables affecting the development of the color were investigated and the conditions were optimized. The effect of Glue, CAT, Os(VIII), and OH concentration on the rate of reaction has been studied. The reactions follow identical kinetics for all It is a first order reaction in both Glue and CAT, but fractional order in alkali and Os(VIII). Increasing ionic strength dielectric constant of the medium had no significant effect on the rate. The effects of added products like halide ions and toluene-p-sulfonamide have also been investigated. A mechanism involving the formation of a complex between Glue-CAT-Os(VIII) has been proposed. The stoichiometry of the reaction is found to be 1:1. The main products of Glue were identified with the help of FTIR and TLC. The reaction constants involved in the mechanism are explained. There is a good agreement between the observed and calculated rate constants under different experimental conditions. Investigations at different temperatures allowed the determination of the activation parameters with respect to the slow step of the proposed mechanism. The proposed methods were successfully applied for the high yield of the products and short reaction times. It is also an inexpensive, simple, and smooth method.Keywords: osmium(VIII)glutamic acidN-chloro 4-methylbenzenesulfonamidekinetics and mechanistic discussed FundingThis project was funded by SABIC and the Deanship of Scientific Research (DSR), King Abdulaziz University, Jeddah, under grant no. (14/299/1433). The authors, therefore, acknowledge and thank SABIC and DSR technical and financial support.

Investigation of an anaesthetic drug (tetracaine hydrochloride) in the presence of ionic fluid and surfactant: Mixed micellization & spectroscopic studies

Core–Shell‐Structured NiS₂@Ni‐B_i Nanoarray for Efficient Water Oxidation at Near‐Neutral pH

Abstract The development of high‐performance and cost‐effective water oxidation catalysts operating under mild conditions is attractive for the conversion of electricity into chemical fuels. In this communication, we report the in situ electrochemical development of a Ni‐B i layer (5–8 nm thick) on a NiS 2 nanoarray supported on carbon cloth (i.e., NiS 2 @Ni‐B i /CC) for efficient water oxidation in 0.1 m potassium borate electrolyte at pH 9.2. As a durable 3 D catalyst electrode, core–shell‐structured NiS 2 @Ni‐B i /CC shows excellent catalytic activity for water oxidation and approaches a geometrical catalytic current density of 20 mA cm −2 at an overpotential of 486 mV, with long‐term electrochemical stability for at least 24 h with a high turnover frequency of 0.28 mol O 2 s −1 at an overpotential of 500 mV and nearly 100 % Faradic efficiency for oxygen evolution.

4-[(Anthracen-9-ylmethylene)amino]-1,5-dimethyl-2-phenyl-1,2-dihydropyrazol-3-one

The title compound, 4-[(anthracen-9-ylmethylene)amino]-1,5-dimethyl-2-phenyl-1,2-dihydropyrazol-3-one (3), was synthesized in high yield by reaction of anthracene-9-carbaldehyde and 4-aminoantipyrine in ethanol. The structure of this new compound was confirmed by elemental analysis, IR, 1H NMR, 13C NMR and GC-MS spectral data.

Synthesis, antibacterial properties and 2D-QSAR studies of quinolone-triazole conjugates

Zero-valent iron-aluminum for the fast and effective U(VI) removal

Ligand based sustainable composite material for sensitive nickel(II) capturing in aqueous media

Retraction notice to “Nanoscale silicon porous materials for efficient hydrogen storage application” [J. Energy Storage 81 (2024) 110418]

Development of selective and sensitive bicarbonate chemical sensor based on wet-chemically prepared CuO-ZnO nanorods