Browsing by Author "Abdulrahman, A. S."

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    Characterisation of ovis aries horn and cocos nucifera shell particles for hybridisation in polymeric composites.
    (Faculty of Engineering, University of Abuja, Nigeria., 2025) Ajao, K. S.; Adebisi, J. A.; Abdulrahman, A. S.; Busari, Y. O.; Shuaib-Babata, Y. L.; Abolarin, M. S.
    The suitability of ovis aries (sheep) horn and Cocos nucifera (coconut) shell particles as hybrid reinforcement in polymeric composites was investigated in this work. Ovis aries horn and Cocos nucifera shell particles were prepared and characterised using TGA, XRF, FTIR, XRD, and SEM analyses. Both samples exhibited appreciable thermal stability as revealed by the TGA curves. XRF analysis featured varied proportions of similar elemental and oxides constituents known to possess good reinforcement characteristics, while SEM micrographs revealed that NaOH treatment of Cocos nucifera shell particles had desirable effect on the fibres surface. XRD patterns of the NaOH treated Cocos nucifera shell particles featured minor peak around 2θ = 35o, suggesting a little alteration in crystallinity. FTIR analysis established the presence of amine groups and disulphide bond in the ovis aries horn, and potentially reactive carbonyl, carboxyl, and hydroxyl groups in the Cocos nucifera shell. Removal of waxy materials, part of lignin and hemicellulose, and reduction in hydroxyl groups of Cocos nucifera shell particles after NaOH treatment were confirmed by FTIR analysis. Hence, the potential of hybridising ovis aries horn and Cocos nucifera shell particles as reinforcement in polymeric composites development is high.
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    Mechanical properties and microstructure of epoxy, horn, alkaline treated/untreated coconut shell particulate hybrid composite.
    (Faculty of Physical Sciences, Federal University, Dutsinma, Nigeria., 2024) Ajao, K. S.; Abdulrahman, A. S.; Abdulkareem, A. S.
    The mechanical properties (Tensile and Flexural Strengths) of sheep horn, treated and untreated coconut shell particles reinforced epoxy composite were investigated in this work. The composite was formulated using design expert software, with weight fraction of epoxy resin varied from 90 to 100%, while that of each of the sheep horn and coconut shell particles varied from 0 to 5 % weight, resulting in the composite of single and hybrid reinforcements. The results obtained showed that tensile and flexural strengths of the hybrid composite were superior to those of the individual fiber reinforced composite. Maximum tensile strength and flexural strength of 36.52 MPa and 67.93 MPa respectively, representing 74.3%, and 35.6% improvement, compared to the tensile strength and flexural strength of the control sample were obtained with the hybrid composite sample containing a blend of 5% wt. sheep horn and 3% wt. treated coconut shell particles. The microstructure analysis revealed the enhanced interfacial adhesion between the matrix and the reinforcement of the composite samples containing alkaline treated coconut shell particles. Hence, alkaline treatment is a good natural fiber’s surface modification technique to improve adhesion between the fibers and the matrix.
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    Thermodynamic Behaviour of Mild Steel Corrosion in an Environment of Bilberry Cactus Plant Extracts in Hydrochloric Acid Solution.
    (Journal of Metallurgy and Materials Engineering. Published by Nigerian Metallurgical Society, Abuja Nigeria., 2014-09-09) Abdulrahman, A. S.; Ibrahim, H. Kobe; Aigbondion, V. S.,; Kareem, A. Ganiyu; Awe, I. Caroline
    The inhibitive action of bilberry cactus plant extracts (BCPE) on mild steel in 1.5 M Hydrochloric acid with addition of different concentrations (0.1-0.5 g/l) was investigated using weight loss and hydrogen evolution measurement methods. The inhibitor organic structures were characterized for their functional groups using Gas Chromatography Mass Spectrometer (GCMS) and Fourier Transformation InfraRed (FTIR) analyses. The results revealed that the protective film formed on the surface of mild steel by the adsorption of extracts in 1.5 M HCL solution obeyed Langmuir adsorption isotherm. It was observed from thermodynamic adsorption parameters (ΔHads, ΔSads and ΔGads) that the inhibitor adsorbed via physical adsorption and the negative values obtained indicated exothermic reaction and spontaneous process. Finally, the effect of substituents type in inhibition efficiency was investigated using Linear Free Energy Relationship (Hammett relationship) and the reaction of adsorption favoured by electron donation of the extract substituent groups.