Faculty of Engineering
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Item 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 AkinlabiHydroxyapatite (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.Item Physico-mechanical properties of cement bonded ceiling board developed from teak and African locust bean tree wood residue(Elsevier, 2021-02-17) I. O. Ohijeagbon; M.U. Bello-Ochende; Adekunle Akanni Adeleke; Peter Pelumi Ikubanni; A.A. Samuel; O. A. Lasode; O. D. AtoyebiOver the years, the pursuit for locally sourced economical and environmentally safe materials has been on the increase in the development of composite boards. These locally sourced materials are organic materials from plants and livestock such as wood residue, feathers, rice husk, maize husk and bamboo fiber. Therefore, this study utilizes species of wood residue in the development composite ceiling boards. Ceiling boards were developed from teak and African locust bean tree wood residue using cement as a binder. The ceiling boards were made by varying the composite mass of the mix and mixing ratio of wood dust to cement. A constant load of 5 kN was used for the compaction process using a hydraulic pressing machine. Physico-mechanical properties of the ceiling boards such as moisture content, density, water absorption, drying shrinkage, tensile strength, and compressive strength were evaluated. The percentage of moisture content were 9.50 and 14.50% for teak and African locust bean tree wood dust, respectively. The values of density varied from 0.56 − 0.68 g/cm3. The water absorption ranged from 9.0 to 39.8% after 24 h immersion and drying shrinkage ranged from 8.60 to 35%. The maximum impact energy obtained is 98 J. The highest tensile, compressive and flexural strengths for the ceiling boards were 1.09, 0.82, and 0.56 MPa, respectively. The composite samples showed that ceiling boards made from teak wood dust is most suitable for interior use. Cement was found to be suitable as a binder for the development of ceiling boards.Item INVESTIGATING THE IMPACT OF ACHI (BRACHYSTEGIA EURYCOMA) ON THE THICKENING TIME OF CEMENT(NJEAS, 2023-01-01) Ayuba Salihu; Yakubu Nuhu; Khadijah Ibrahim; Abdullahi Gimba; Petrus Nzerem; Ikechukwu Okafor; Oghenerume OgoloIn recent times, more wells are being drilled and producing in the petroleum industry. To prevent early workover resulting from casing collapse caused by corrosion, shattering of cement sheath during perforation and fracturing, and to protect the integrity of the well, it is important to use properly designed cement slurry with appropriate additives to protect the well from the formation. The development of adequate thickening time cement is a critical task in cementing operations today. Achieving suitable thickening time of oil well cement ensures both prevention of lost circulation and a long wait on cement time. With this in mind, this research work shows a comparative study of the thickening time of oil well cement with achi and without achi contamination under different temperature of 130 ℉, 150 ℉, 200 ℉, and 250℉ and pressure conditions of 1000 psi, 1500 psi, 2000 psi and 3000psi respectively for all the experiment conducted. The thickening time of cement slurry without achi content at 70 Bc were 205, 215, 202 and 200 minutes respectively. The experiment was also conducted under different achi content ranging from 2 g, 4 g, 8 g, 10 g to 12g. The results and analysis were compared. The result with 2g achi content were 164, 147, 146, and 141 minutes. The results with 4g achi content were 127, 131, 130, and 124 minutes. The results with 8g achi content were 71, 69, 75, and 65 minutes, while the results at 10g achi content were 67, 62, 63, and 60 minutes. The results with 12g achi content were 63, 62, 60, and 56 minutes under the temperature and pressure respectively. The data obtained from the experiment signifies that introducing achi and altering the temperature and pressure to the cement slurry has a significant effect on the properties of the cement by accelerating the thickening time.