Browsing by Author "Peter Omoniyi"

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Composite Tiles Produced from Granite Dust and Tree Pruning Using a Sandwiched Method
(IIETA, 2023-08-31) Idehai Ohijeagbon; Olawale Aransiola; Adekunle Akanni Adeleke; Peter Omoniyi; Peter Pelumi Ikubanni; Daniel Oguntayo
Projected by the United Nations, a global population surge to an estimated 9.6 billion by 2050 is anticipated, exerting substantial demands on Earth's finite natural resources for construction materials. This research endeavors to scrutinize and fabricate an innovative recycling approach for almond tree pruning as core materials, integrated with granite dust, employing cement as a binding agent in the fabrication of composite tiles measuring 190×98mm. Adhering to ISO standards, the resultant product underwent rigorous evaluation encompassing density, water absorption, flexural strength, compressive strength, and thermal conductivity. The composite tiles manifest a density spectrum spanning from 1.05 to 1.89 g/cm³, coupled with a water absorption capacity ranging from 8.25% to 33.89%. The experimental findings reveal that the integration of almond tree pruning amidst granite dust leads to a reduction in the flexural and compressive strengths of the composite tiles. Nevertheless, Sample A (comprising 78% granite dust, 2% tree pruning, and a 20% cement admixture) attains the pinnacle of flexural strength at 1.256 MPa and compressive strength at 0.421 MPa, thus representing the optimal blend ratio. Additionally, the thermal conductivities of these composite tiles exhibit a variance from 0.022 to 0.3802 W/mK, rendering them ideally suited for applications requiring low-load bearing, insulation, lightweight properties, and energy-efficient construction tiles.
Electrochemical Studies of the Corrosion Behavior of Al/SiC/PKSA Hybrid Composites in 3.5% NaCl Solution
(MDPI, 2022-09-30) Peter Pelumi Ikubanni; Makanjuola Oki; Adekunle Akanni Adeleke; Olanrewaju Adesina; Peter Omoniyi; Esther Akinlabi
The corrosion behavior of metal matrix composites (MMCs) is accelerated by the inclusion of reinforcements. Hence, this study investigates the corrosion behavior of MMCs produced from Al 6063 matrix alloy with reinforcement particulates of silicon carbide (SiC) and palm kernel shell ash (PKSA) inclusion at different mix ratios. The MMCs were synthesized using the double stir casting technique. The corrosion behaviors of the composites in NaCl solutions were studied via gravimetric analysis and electrochemical measurements. The gravimetric analysis showed fluctuating dissolution rate of the samples in NaCl solution to indicate flawed film as well as corrosion product formation over the surface of the specimens. The observed corrosion mechanism of the samples was general and pitting corrosion. The presence of reinforcements within the Al6063 matrix acted as active sites for corrosion initiation. The range of values for Ecorr and Icorr obtained in 3.5% NaCl at 24 h was between −220.62 and −899.46 mV and between 5.45 and 40.87 µA/cm2, respectively, while at 72 h, the Ecorr values ranged from 255.88 to −887.28 mV, and the Icorr ranged from 7.19 to 16.85 µA/cm2. The Nyquist and Bode plots revealed the electrochemical corrosion behavior of the samples under investigation, with predominant reactions on the surface of the samples linked to charge transfer processes. The relative resistance to corrosion of the samples depends on the thin oxide film formed on the surface of the samples.
PHYSICO-TRIBOLOGICAL CHARACTERISTICS AND WEAR MECHANISM OF HYBRID REINFORCED Al6063 MATRIX COMPOSITES
(SciCell, 2021-02-02) Peter Pelumi Ikubanni; Makanjuola Oki; Adekunle Akanni Adeleke; Olanrewaju Adesina; Peter Omoniyi
The development of engineering materials is continuously attracting attention from scientists and engineers for numerous engineering applications. The physical properties and wear mechanism of aluminium (Al 6063) matrix reinforced with silicon carbide (SiC) and palm kernel shell ash (PKSA) particulates at different weight ratios ranging from 0 to 10 wt. % with 2 wt.% intervals were investigated. The liquid route of double stir casting was employed in synthesizing the composites. The wear experiment was conducted using the Taber-type wear abrasion machine. The worn surfaces were examined using scanning electron microscopy (SEM) with energy-dispersive x-ray spectroscopy (EDS), while the intermetallic phases were examined using the x-ray diffractometer (XRD). From the result, the increase in PKSA and SiC lowered and improved the density of the composites, respectively. The percentage porosity values (2 - 2.4%) obtained in this study were found to be within the acceptable limit of less than 4% for metal matrix composites castings. The mass loss and wear index increased owing to the rotating speed and applied load increase due to the occurrence of mechanical mixing between the contacting surface of the sample disk and the machined disc. Adhesive and abrasive wear mechanisms were the major mechanisms observed in this study. The produced sample showed low wear resistance and will be found useful in areas with low frictional interactions.
Synthesis and Characterization of Eggshell-derived Hydroxyapatite for Dental Implant Applications
(EDP Sciences, 2023-01-01) Jamiu Kolawole Odusote; Adekunle Akanni Adeleke; Peter Pelumi Ikubanni; Peter Omoniyi; Tien-Chien Jen; G. Odedele; Jude A. Okolie; Esther Titilayo Akinlabi
Hydroxyapatite (HAp) production from eggshells for dental implant purposes involved a novel approach utilizing a wet chemical precipitation technique. The eggshells, finely ground to a size below 250 μm, underwent calcination at a high temperature of 900°C for 2 hours. This thermal treatment facilitated the conversion of calcium carbonate into calcium oxide (CaO) while eliminating any organic components in the eggshell. To initiate the synthesis of HAp, a solution comprising 0.6 M phosphoric acid was added to the CaO dispersed in water. The resulting mixture was allowed to undergo aging at different time intervals ranging from 0 to 24 hours, promoting the formation of HAp. Subsequently, the HAp particles were oven-dried at 100°C for 2 hours to remove residual moisture. Finally, the dried particles were sintered at 1200°C in a muffle furnace to achieve the desired properties for dental implant applications. XRD peaks at 25, 33, 40, and 50° confirm the synthesized material as HAp. Vibrational modes of phosphate (PO43-), hydroxyl (OH-), and carbonate (CO32-) groups indicate carbonated HAp. Synthesized HAp holds potential for biomedical applications.