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Articles by M.Z. Abdullah
Total Records ( 4 ) for M.Z. Abdullah
  M.S. Mat-Shayuti , M.Z. Abdullah and P.S.M. Megat-Yusoff
  This study investigates the effect of blending polycarbonate (PC) into polypropylene (PP) matrix polymer on water absorption properties and morphology. The blends, containing 5-35% of polycarbonate and 5% compatibilizer, were compounded using twin - screw extruder and fabricated into standard tests samples using compression molding. The compatibilizer used was polypropylene-graft-maleic anhydride (PP-g-MA). In water absorption test, specimens were immersed in distilled water at 23 and 100°C. In 23°C immersion, PC showed the highest absorption at 0.362 wt.% while PP was the lowest at 0.064 wt.%. The blends demonstrated transitional absorption value between PP and PC. In 100°C immersion, 90/5/5, 80/15/5 and 70/25/5 compositions (PP/PC/PP-g-MA) exhibited lower absorption than PP, indicating enhanced long-term degradation resistance in water compared to PP. Microscopy analysis showed that PC existed as fibers, dispersed throughout PP matrix.
  E. Mohammadpour , M. Awang and M.Z. Abdullah
  A finite element simulation technique for estimating the mechanical properties of Single-Walled Carbon Nanotube (SWCNT), polymer composites is developed. In the present modeling work, individual carbon nanotube is simulated as a frame-like structure and the primary bonds between two nearest-neighboring atoms are treated as 3D beam elements. The beam element nonlinear properties are determined via the concept of energy equivalence between molecular dynamics and structural mechanics using Modified Morse potential. Young’s modulus of SWCNTs is estimated to illustrate the accuracy of this simulation technique. Results show that the obtained mechanical properties of nanotubes by the present method are in good agreement with their comparable results.
  H.H.P.L. Pham , R. Rusli and M.Z. Abdullah
  Carbon Capture and Storage (CCS) is an alternative for decreasing greenhouse gas (GHG) emissions by removing carbon dioxide (CO2) from power plants. Accidental discharges from CCS plant will result in a release of dense CO2 gas cloud to the ambience at high concentration which becomes a dominated threat to human health. However, there is a knowledge gap in assessing the release of CO2 via pipeline leakage. Thus, it is necessary to develop an accurate consequence model for CO2 release in order to demonstrate a safe layout and other safeguards. In this study, pure CO2 discharge and dispersion have been detailed out using a three-dimension model with presence of obstacles in a Computational Fluid Dynamics (CFD) software. The realizable κ-ε turbulence model was chosen for simulating the dispersion of pure CO2-air. A case study based on Kit Fox gas experiments of pure CO2 instantaneous release is developed to evaluate the discharge scenario. The results obtained from the model are compared with experimental data available in literatures and validation is achieved.
  C.S. Ramesh , R. Noor Ahmed , M.A. Mujeebu and M.Z. Abdullah
  Copper based composites having hard reinforcements such as silicon carbide, alumina and cerium oxide do possess higher strength, better wear resistance and higher coefficient of friction when compared to copper. However, they pose several challenges in machining such as higher tool wear and inferior surface finish. On the other hand, copper based composites having soft reinforcements such as graphite, molybdenum disulphide and calcium fluoride do possess lower coefficient of friction and better machinability characteristics. Against this background, an attempt is made to develop a new class of copper composite materials by dispersing both the hard and soft reinforcements in appropriate proportions to ensure optimization of mechanical properties and machinability characteristics. In this paper the development and testing of copper–TiO2–boric acid composites by liquid metallurgy method is presented. Metallographic study, micro hardness, tensile strength, friction and wear tests on these hybrid composites have been carried out. The results show that copper–TiO2–boric acid composites possess higher hardness, higher tensile strength, higher coefficient of friction and better wear resistance when compared with pure copper.
 
 
 
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