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The inhibition of aluminium metal corrosion in 1.85 M hydrochloric acid solution using extract of Carica papaya leaf was studied using gasometric technique. Aluminium coupons were immersed in test solutions of un-inhibited 1.85 M HCl and... more
The inhibition of aluminium metal corrosion in 1.85 M hydrochloric acid solution using extract of Carica papaya leaf was studied using gasometric technique. Aluminium coupons were immersed in test solutions of un-inhibited 1.85 M HCl and those containing extract concentrations of 10 %, 20 %, 30 %, 40 % and 50 % (v/v) at room temperature. The volume of hydrogen gas evolved as a result of the rate of reaction between aluminium coupons and the acid extracts was recorded. The inhibition efficiency of the extract was determined and the adsorption isotherm of the process was estimated using Temkin, Freundlich, Frumkin and Langmuir adsorption theories. The microstructure examination was also determined. The result of the investigation induced that the Carica papaya leaf extract retarded the acid induced corrosion of aluminium with a reduction in the volume of hydrogen gas evolved per increasing extract concentrations. The adsorption studies revealed Langmuir isotherm as the best model for...
Research Interests: Chemistry and Morphology
The role of batteries towards mitigating the challenge of intermittent nature of solar and wind electricity supply cannot be over-emphasised. Batteries are essential complements to solar and wind electricity as we seek to increase the... more
The role of batteries towards mitigating the challenge of intermittent nature of solar and wind electricity supply cannot be over-emphasised. Batteries are essential complements to solar and wind electricity as we seek to increase the proportion of renewable electricity in the global energy mix. Since batteries are devices for chemical-electrical energy inter-conversion, their usefulness depends on chemistry. This makes it imperative to improve on the chemistries of existing commercial batteries for grid-scale electricity storage applications. In this contribution, we examined the chemistries of lead-acid, zinc-alkaline, lithium ion, aluminium and liquid metal batteries vis-a-vis their utility for grid-scale electricity storage. Simple assembly and rugged cell operation are key advantages of lead-acid batteries despite their low specific capacity. Poor cycle life span and low cell voltage are the main weaknesses of zinc-alkaline batteries. Emerging zinc ion batteries with improve cy...
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Corrosion inhibition effect of extract ofVernonia amygdalina on aluminium in acidicmedia was studied using gravimetric method. The results revealed that V. amygdalina could be used as an eco-friendly corrosion inhibitor for aluminium in... more
Corrosion inhibition effect of extract ofVernonia amygdalina on aluminium in acidicmedia was studied using gravimetric method. The results revealed that V. amygdalina could be used as an eco-friendly corrosion inhibitor for aluminium in HCl solution. The corrosion inhibition efficiency of the extract increases with it concentration of in the corrosion media. Surface coverage of the extract obeyed Langmuir adsorption isotherm. Hence, the corrosion inhibition effect of the extract was rationalised via adsorption mechanism.
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Surpassing heart diseases, cancer is taking the lead as the deadliest disease because of its fast rate of spreading in all parts of the world. Tireless commitment to searching for novel therapeutic medicines is a worthwhile adventure in... more
Surpassing heart diseases, cancer is taking the lead as the deadliest disease because of its fast rate of spreading in all parts of the world. Tireless commitment to searching for novel therapeutic medicines is a worthwhile adventure in synthetic chemistry because of the drug resistance predicament and regular outbreak of new diseases due to abnormal cell growth and proliferation. Medicinal chemistry researchers and pharmacists have unveiled quinoxaline templates as precursors of importance and valuable intermediates in drug discovery because they have been established to possess diverse pharmacological potentials. Hence, this review highlights the current versatile routes to accessing functionalized quinoxaline motifs and harnessing their documented therapeutic potentials for anticancer drug development.
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In the quest for environmental remediation which involves eco-friendly synthetic routes, we herein report synthesis and modeling of silver nanoparticles (Ag NPs) and silver/nickel allied bimetallic nanoparticles (Ag/Ni NPs) using... more
In the quest for environmental remediation which involves eco-friendly synthetic routes, we herein report synthesis and modeling of silver nanoparticles (Ag NPs) and silver/nickel allied bimetallic nanoparticles (Ag/Ni NPs) using plant-extract reduction method. Secondary metabolites in the leaf extract of acted as reducing agent. Electronic transitions resulted in emergence of surface plasmon resonance in the regions of 416 nm (Ag NPs) and 421 nm (Ag/Ni NPs) during optical measurements. Further characterizations were done using TEM and EDX. Antimicrobial activity of the nanoparticles against clinical isolates was highly significant as < 0.05. These findings suggest application of Ag NPs as antibacterial agent against and antifungal agent against . Possible antibacterial drugs against and can also be designed using Ag/Ni nanohybrid based on their strong inhibition activities. Similarly, the enhanced SPR in the nanoparticles is suggested for applications in optical materials, as go...
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Magnetic nanocomposite material composed of silica coated MgFe2O4 for potential biomedical applications were synthesized by a two-step chemical method including solution combustion synthesis, followed by silica coatings of the ferrite... more
Magnetic nanocomposite material composed of silica coated MgFe2O4 for potential biomedical applications were synthesized by a two-step chemical method including solution combustion synthesis, followed by silica coatings of the ferrite nanoparticles. The effects of silica coatings on the structural, morphological and magnetic properties were comprehensively investigated using powder X-ray diffraction (XRD), Field Emission Scanning Electron Microscope (FESEM), energy dispersive absorption x-ray (EDAX), Fourier Transform Infrared spectroscopy (FTIR), thermogravimetric analysis and differential thermal analysis (TG–DTA) and vibrating sample magnetometer (VSM). The colloidal behaviour of coated MNPs in physiological saline medium like water or phosphate buffer saline (PBS) was also studied by zeta potential measurements. The XRD patterns indicate that the crystalline structure is single cubic spinel phase and the spinel structure is retained after silica coating. Also, after silica coati...
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ABSTRACT ARTICLE INFO ABSTRACT The study was carried out to assess the physicochemical properties, phytochemical screening and antimicrobial activities of twenty five different edible vegetable oil samples collected from Ota, Ogun state... more
ABSTRACT ARTICLE INFO ABSTRACT The study was carried out to assess the physicochemical properties, phytochemical screening and antimicrobial activities of twenty five different edible vegetable oil samples collected from Ota, Ogun state in Nigeria for their domestic and commercial applications. The moisture contents (0.02 – 0.13%), acid values (0.46 – 1.73 mg KOH/g), saponification values (226.19 – 310.19 mg KOH/g), iodine values (0.06 – 1.17 mg I2/g) and the low pH values (0.0 – 2.49) generally make these vegetable oils to be more useful in industrial applications than consumed directly or indirectly as ingredients in food. The results of the phytochemical screening of these oil samples indicated the presence of terpenoids, deoxysugar, steroids and cardenolides. The microbial sensitivity tests showed that most of the vegetable oil samples exhibited no inhibitory power against candida, Klebsiella pneumonia, Escherichia coli but only sample 25 (soya bean oil) was sensitive to these three microbes and its inhibition of these microbes was concentration dependent. The mineral contents of these oils showed detectable levels of Zn
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ABSTRACT A versatile route to synthesize polymer based and polyol mediated silver nanoparticles with tunable morphological properties was evolved. Novel three dimensional (3D) quasi nanocubes, one dimensional (1D) nanorods and (2D)... more
ABSTRACT A versatile route to synthesize polymer based and polyol mediated silver nanoparticles with tunable morphological properties was evolved. Novel three dimensional (3D) quasi nanocubes, one dimensional (1D) nanorods and (2D) nanorods were produced by rapid solution phase transformation of silver sol with hot addition of absolute ethanol or toluene. The optical characterization showed existence of plasmon resonance band occurring in all cases. The electron micrographs revealed that the shape, size and size distribution of as prepared silver nanoparticles depended on the stabilizer or capping agent, mole ratio of met-al ion sources, temperature and time of reaction.
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ABSTRACT The present article reports eco-friendly multi-functional polyurethane–ZnO hybrid nanocomposite coatings obtained from Thevetia peruviana seed oil (TPSO). Initially, the polyols were prepared by treating TPSO with glycerol and... more
ABSTRACT The present article reports eco-friendly multi-functional polyurethane–ZnO hybrid nanocomposite coatings obtained from Thevetia peruviana seed oil (TPSO). Initially, the polyols were prepared by treating TPSO with glycerol and the formation was supported by Fourier transform infrared (FT-IR) and 1H-NMR studies. In the next stage, siloxane functionalized ZnO nanoparticles were added to the polyol mixture in different weight percentages (0, 1 and 2 %) and then treated with excess 4,4′-diisocyanatodicyclohexylmethane (H12MDI) in order to synthesize isocyanate terminated polyurethane nanocomposites. The polyurethane hybrids were then casted as thin films and cured under atmospheric moisture. After complete curing they were characterized by using FT-IR, 1H-NMR, 13C-NMR, X-ray diffraction, scanning electron microscopy, thermogravimetric analysis, and dynamic mechanical thermal analysis techniques. The hybrid nanocomposites showed superior thermo-mechanical and anti-corrosive properties compared to pristine polyurethane. Also, due to the presence of nano ZnO in the polyurethane matrix, the composite coatings are showing excellent resistance towards various bacterial and fungal stains.
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ABSTRACT New series of phenylantimony chloride and antimony chloride with Schiff base ligands, L1H and L2H having N∩S and N∩O donor systems were synthesized under microwave irradiation using a domestic microwave oven. The reaction time... more
ABSTRACT New series of phenylantimony chloride and antimony chloride with Schiff base ligands, L1H and L2H having N∩S and N∩O donor systems were synthesized under microwave irradiation using a domestic microwave oven. The reaction time was brought down from hours to a few seconds with improved yield as compared with conventional heating. All the ligands and their antimony(III) derivatives were characterized on the basis of microanalysis, elemental analyses, molecular weight determinations and spectral studies including IR, NMR (1H and 13C) and electronic spectral studies. A distorted trigonal bipyramidal and pseudo-octahedral geometry around the antimony atom was tentatively proposed for these derivatives. The compounds were screened in vitro against bacteria and fungi to test their antimicrobial property and in vivo in male albino rats to test their antifertility properties. The treatment with the ligands and their phenylantimony derivatives at dose levels of 20 mg per rat per day did not cause any significant change in body weight, but a significant reduction in the weights of reproductive organs was observed. Arrest of spermatogenesis was noted at various stages with production of primary spermatocytes (preleptotene and pachytene), secondary spermatocytes and step-19 spermatids found to be decreased. Biochemical parameters of tissues, i.e. protein, sialic acid, cholesterol content of testes and seminal vesicular fructose also showed significant reduction. Further, the serum testosterone concentrations were also decreased after treatment with ligands and their antimony(III) derivatives. Copyright © 2008 John Wiley &amp; Sons, Ltd.
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The deficiency in affordable nourishing foods for neonates after weaning has been major concern in developing countries and this has contributed to increased malnutrition rate, illnesses and even children’s mortality rate. The addition of... more
The deficiency in affordable nourishing foods for neonates after weaning has been major concern in developing countries and this has contributed to increased malnutrition rate, illnesses and even children’s mortality rate. The addition of wheat offal to traditionally affordable ‘Ogi’ as an alternative approach for combating the threats of protein malnutrition in neonates was explored in this work. Wheat offal was added at increasing levels of 0, 20, 40, 60, 80 and 100 w/w% as fortifying feed with prepared maize-Ogi as meal. Proximate analysis, pasting characteristics, sensory evaluation, nutritive and functional properties of the resulting blends was evaluated using standard methods. Results of proximate analysis showed an increased protein (2.787 – 34.064%), fat (2.282 – 9.015%) and ash (8.913 – 17.171%) contents with increased level of wheat offal from 20 to 100 w/w addition, while decreased carbohydrate content was observed with increased addition of wheat offal. The water absorp...