Abu Bakar

Abu Bakar
Universiti Kebangsaan Malaysia | ukm · Department of Mechanical and Materials Engineering

Doctor of Philosophy (Sejong University)

About

261
Publications
125,562
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
4,211
Citations
Additional affiliations
March 2002 - present
Universiti Kebangsaan Malaysia
Position
  • Professor (Associate)
March 2002 - present
Universiti Kebangsaan Malaysia
Position
  • Professor (Associate)

Publications

Publications (261)
Article
Full-text available
Bone implants are widely used to restore bone loss due to several factors including but not limited to osteoporosis, osteoarthritis and road injuries. Current bone implant materials restore mechanical stability but suffer from a lack of osteointegration and will need to be replaced after long term use. To circumvent this, tissue engineering which c...
Article
Full-text available
In this research, we investigated the influence of the sintering temperature on the physical and mechanical properties of micro-sized bi-material components of 17-4PH stainless steel and 3 mol% yttria-stabilized zirconia fabricated using a two-component micro-powder injection molding (2C-μPIM) process. First, 17-4PH and zirconia powders were separa...
Article
Full-text available
Wound healing is a therapeutic challenge due to the complexity of the wound. Various wounds could cause severe physiological trauma and bring social and economic burdens to the patient. The conventional wound healing treatments using bandages and gauze are limited particularly due to their susceptibility to infection. Different types of wound dress...
Article
Full-text available
This study aims to improve the electrical-mechanical performance of traditional epoxy/graphite composites for engineering applications. The improvement in the properties of these composites depended on the incorporation of different sizes of graphite particles of the same type and controlling their curing process conditions. The thermal properties...
Article
This study focuses on the development of an asymmetric membrane comprised of an electrospun carboxyl-functionalised multi-walled carbon nanotube (COOH-MWCNT)/poly (vinyl alcohol) (PVA) composite nanofibre layer on a dense PVA separation layer (MCOOH-MWCNT). The electrospun nanofibre layer in this study acts as a “pre-selective layer” instead of its...
Article
Full-text available
Additively manufactured polymeric composites exhibit customised properties beyond those offered by conventionally fabricated ones. However, in many cases, the mechanical performance mainly depends on the processing parameters, tools, and material selection. Yet, one of the issues of the additive manufacturing process especially in the material extr...
Article
This research successfully fabricated conductive polymer composites (CPCs) prepared using multiple sizes of graphite filler (40, 100, 150, and 200 µm) that provided excellent network formation within the fillers and polypropylene matrix which further improved both electrical conductivity and flexural strength. An important discussion on the fabrica...
Article
Full-text available
The use of kenaf fiber as a reinforcement material for polymer composites is gaining popularity, especially in the production of automotive components. The main objective of this current work is to relate the effect of alkali treatment on the single fiber itself and the composite material simultaneously. The effect of temperature condition during m...
Article
Pores play a crucial role in bone regeneration as they allow the exchange of nutrition and oxygen, expulsion of waste products, and bone tissue and vascular ingrowth through the scaffold. From a mechanical aspect, the overall porosity is more effective compared to the pore size and interconnectivity, while pore size and interconnectivity impose the...
Article
Full-text available
Biocomposite materials have revolutionized the engineering field, predominantly in manufacturing applications, where these materials were widely used as an alternative to the metal-based structural body or component. Since conventional materials have caused various pollution problems to the ecosystem, innovative efforts have been taken to develop t...
Article
A large amount of wastewater is typically discharged into water bodies and has extremely harmful effects to aquatic environments. The removal of heavy metals from water bodies is necessary for the safe consumption of water and human activities. The demand for seafood has considerably increased, and millions of tons of crustacean waste are discarded...
Article
Two-component micro-powder injection molding (2C-μPIM) is a promising technique to produce bi-material micro-sized components of 3 mol% yttria-stabilized zirconia (3YSZ) and 17-4PH stainless steel (SS 17-4PH). In this research, the solvent and thermal debinding mechanisms of the green 3YSZ/SS 17-4PH micro-parts were investigated using a systematic...
Article
Full-text available
The development of porous metal structures, especially for the use of titanium alloys in bone implant applications, has attracted the attention of researchers. However, forming porous structures in titanium composites via powder injection molding (PIM) remains in the early stages of analysis, allowing the determination of processing parameters to b...
Article
Full-text available
Metallic foams and porous materials can be produced by various methods. Among the methods that can produce metallic foams and porous materials, powder metallurgy is a promising method. This study investigates the production of a porous stainless steel by the space holder method in powder metallurgy. A novel space holder i.e. glycine and binder cons...
Conference Paper
Progressive development of natural materials for automotive interior parts has attracted the industry attention and given rise to a need for effective simulation of designs and concepts to help achieve an efficient manufacturing product. For this purpose, numerical simulation of the preliminary forming process was conducted using the geometry model...
Article
Full-text available
The lacklustre performance of metallic biomaterials commonly used in orthopaedic implants is due to inadequate bio-functionality, high degradation rate, and implant-associated infections that compromise its bone bonding ability resulting in implant failure. Therefore, in order to increase the bio-functionality of these metallic biomaterials, it is...
Article
Full-text available
Ti6Al4V-HA composites have been recognized for their potential for biomedical implantation purposes. In the present study, Ti6Al4V-HA composites were fabricated by Powder Injection Molding (PIM) route. Ti6Al4V-HA feedstock at a ratio of 87:13 vol.% was prepared by using a binder system consisting of palm stearin (PS) and polyethylene (PE). The Crit...
Article
Full-text available
This paper presents an alternative approach in powder injection moulding (PIM) process by highlighting the advantages of using irregular-shaped and bimodal size powder in Ti6Al4V-HA composite. An investigation on the rheological behaviour Ti6Al4V-HA feedstock at a ratio of 90:10 weight percent was done using spherical and irregular shapes of Ti6Al4...
Article
Full-text available
Continuous carbon fibre offers a huge potential which is a lightweight, high strength, low density, a low coefficient of thermal expansion, and high thermal conductivity and stiffness. In addition, polyamide-6 (PA6) has good mechanical and physical properties thus, it makes PA6 as effectiveness between matrix and reinforcement of continuous carbon...
Article
Metallic bipolar plates tendency to have high contact resistance, but also very susceptible to corrosion. This may decrease in the performance of fuel cells after several times of usage in fuel cell applications. Research has shown that after a metal plate was coated, the characteristic of materials dependent on the type, composition of the coating...
Article
h i g h l i g h t s Catalyst supporting materials were synthesized by solution processing methods. Polymer/MWCNT nano-composites considerably enhanced in the BET surface area. MWCNT/PBI/Pt electrocatalyst exhibits higher catalytic activity and constancy. Nanocomposite Multi-walled carbon nanotube Electrocatalyst PEM fuel Cell a b s t r a c t In thi...
Article
Full-text available
The incorporation of kenaf fiber fillers into a polymer matrix has been pronounced in the past few decades. In this study, the effect of multiwalled carbon nanotubes (MWCNTs) with a short kenaf fiber (20 mesh) with polypropylene (PP) added was investigated. The melt blending process was performed using an internal mixer to produce polymer composite...
Article
Full-text available
Automotive parts, including dashboards and trunk covers, are now fabricated through a compression-molding process in order to produce lightweight products and optimize fuel consumption. However, their mechanical strength is not compromised to avoid safety issues. Therefore, this study investigates kenaf-fiber-reinforced polypropylene composites usi...
Article
Powder injection molding (PIM) is a well-known manufacturing technique for the production of complex, net-shaped macro-parts using a broad range of materials and alloys. Eventually, the PIM method has been modified into micro-powder injection molding (μPIM) because of the increasing demand of micro-parts in global market. Now-a-days PIM and μPIM pr...
Article
Full-text available
From the micro-powder injection molding (μPIM) process, a two-component micro-powder injection molding (2C-μPIM) process has evolved due to the growing demand for multi-functional micro-components in avant-garde applications. 2C-μPIM technology provides the opportunity to conjugate distinct materials within one part. Stainless steel (SS 17-4PH) and...
Article
Full-text available
In this study, the Taguchi method is used to find the optimal moulding parameters for the metal injection moulding (MIM) feedstocks. Parameters optimised are injection temperature (factor A), mould temperature (factor B), injection pressure (factor C) and flow rate (factor D). Feedstocks used were water atomised stainless steel powder with a solid...
Article
Full-text available
In this study, a biodegradable, cheap and durable recycled high-density polyethylene (rHDPE) polymer reinforced with rice husk (RH) fibre was fabricated into a foam structure through several processes, including extrusion, internal mixing and hot pressing. The effect of filler loading on the properties of the foam and the influence of RH surface tr...
Article
Full-text available
The main aim of this paper is to achieve the suitable SA-GEL (sodium alginate and gelatin) porous cartilage scaffold by 3D printing technology with optimal prediction parameters. Firstly, the characteristics of SA-GEL were analyzed, the influence of calcium chloride on the gel was explored, and the optimal cross-linking concentration and gelation t...
Article
For the first time, an innovative combed technique was used for the successful preparation of untreated kenaf fibre. Subsequent to investigations, the combed strategy, provided a smooth kenaf surface with a tensile strength of 692 MPa. Although, while the water absorption was recorded as an excellent 8%, the 92° contact angle, indicated exceptional...
Article
Full-text available
To date, the mechanical performance of kenaf composites is still unsatisfied in term of its mechanical performance. Therefore, research focuses on kenaf composites fabrication through the selection of polymer resin, including epoxy, polypropylene, and polylactic acid. The incorporated kenaf fibre at 10 wt % to 40 wt % loadings was conducted using i...
Article
Full-text available
Polymer composites have been extensively fabricated given that they are well-fitted for a variety of applications, especially concerning their mechanical properties. However, inadequate outcomes, mainly regarding their electrical performance, have limited their significant potential. Hence, this study proposed the use of multiple fillers, with diff...
Article
Full-text available
Metal-ceramic composites such as titanium-hydroxyapatite have been extensively studied as a new generation of implant material in medical application. The powder injection moulding (PIM) process is one the viable processing method in producing the titanium-hydroxyapatite composite which offers extreme geometry part at a lower cost of production. Th...
Article
Bipolar plates significantly contribute to the development of the polymer electrolyte membrane (PEM) fuel cells technology due to their ability to produce high electrical conductivity based on the type of materials used. Mismatching of inappropriate materials and manufacture may lead to the inferior performance of PEM fuel cells. Hence, material de...
Article
In this study, the milled carbon fibre (MCF), multi-walled carbon nanotubes (MWCNT), synthetic graphite (SG) and polypropylene (PP) were fabricated using the compression moulding technique to produce a bipolar plate. The electrical conductivity and mechanical properties of the composite materials were also investigated based on different applied co...
Article
Full-text available
The combination of a metallic bioinert material, stainless steel 316L (SS316L) and a bioactive material, hydroxyapatite (HA) can produce a composite material which has superior properties for orthopaedic applications. The main objective of this study is to investigate the effects of sintering temperature and time on the physical and mechanical prop...
Article
Bipolar plates significantly contribute to the development of the polymer electrolyte membrane (PEM) fuel cells technology due to their ability to produce high electrical conductivity based on the type of materials used. Mismatching of inappropriate materials and manufacture may lead to the inferior performance of PEM fuel cells. Hence, material de...
Article
Composite biomaterials are in high demand in the medical field of today. The combination of bioactive wollastonite (WA) glass ceramic with the biocompatibility of alloy titanium (Ti6Al4V) could be a good candidate for implant applications. The rheological properties of Ti6Al4V/WA feedstock show a pseudoplastic behaviour with low activation energy....
Article
Conductive polymer composite (CPC) materials are extensively used for the bipolar plate in Polymer Electrolyte Membrane Fuel Cells (PEMFCs). The produced CPC materials through the extrusion process strongly relate to electrical conductivity and mechanical properties. In this study, milled carbon fibre (MCF) reinforced polypropylene (PP) incorporati...
Article
Full-text available
Sluggish oxygen reduction reaction (ORR) in cathode electrode is the most common problem in Proton Exchange Membrane (PEM) fuel cell systems. In this study, the ORR behaviours of a half-cell in the cathodic part were investigated which had an impact on its catalyst activity. The electrode was synthesized from multi-walled carbon nanotubes (MWCNT) s...
Article
Full-text available
This review paper deals with the previous and current works published on the kenaf fiber composites. Kenaf is grown commercially in South East Asia country and widely used in the construction and infrastructure as well as in the automotive industry. Kenaf fiber is usually reinforced with synthetic based polymer resin such as polypropylene. However,...
Article
The effects of corrosion behavior and interfacial contact resistance (ICR) of sputtered chromium carbonitride (CrCN) on SUS 316L are investigated. The corrosion behavior of CrCN coatings as potential bipolar plates in proton exchange membrane fuel cells (PEMFCs) are studied by potentiodynamic tests in 0.5 M sulfuric acid (H2SO4) with a scan rate of...
Article
Polymer as well as polymer composites are inclined to premature due to effect on mechanical and physical properties during service time. In this paper, the effect of thermal cycling (−30 to 80 °C) on the physical and tensile properties of Polypropylene (PP), Kenaf/PP, Kenaf/PP/CNTs and Kenaf/CNTs/MAPP/PP hybrid composites for the injection moulded...
Article
Titanium-ceramic composites are potential implant material candidates because of their unique mechanical properties and biocompatibility. This review focused on the latest advancement in processing of titanium-ceramic materials. Previously, titanium-ceramic incorporated using different coating techniques, i.e., plasma spraying and electrophoretic d...
Article
Full-text available
This study optimized the H 3 PO 4 acid doping level (ADL) of polybenzimidazole (PBI) polymer electrolyte membranes using Taguchi method and characterized their ionic conductivity, contour plot and performed statistical regression analysis. Electrochemical impedance spectroscopic (EIS) analysis revealed that PBI copolymer-1 exposed better ionic cond...
Article
Full-text available
This Extrusion permit in controlling electrical conductivity before composite materials undergo the manufacturing process. However, studies on electrical conductivity in high conductive polymer composite materials are still in preliminary stage. Thus, the studies on electrical conductivity model are crucial as it able in predicting the electrical c...
Article
Full-text available
This research was focused on mixing of submicron cemented carbide (WC-Co-VC) powder and binder. WC-Co-VC powder particle size and morphology were analyzed by laser diffraction and field emission scanning electron microscopy. The WC-Co-VC powder was kneaded with a paraffin wax based binder system. Based on critical solid loading, the feedstock with...
Article
Full-text available
The combination of metallic bio-inert material, stainless-steel 316L (SS316L) and a bio-active material, hydroxyapatite (HA) can produce a composite which has superior properties for orthopaedic applications. The main objective of this study is to investigate the effects of sintering temperature and holding time on the physical and mechanical prope...
Article
Mass produced of desired molded parts is possible with Powder Injection Molding (PIM). This work focused on the rheological properties of stainless steel (SS) 17-4PH with a binder system of palm stearin (PS) and polyethylene (PE). The critical powder volume percentage of SS17-4PH at 75vol% was obtained. Based on such value, the powder loadings used...
Preprint
Bipolar plates significantly contribute in the development of the polymer electrolyte membrane (PEM) fuel cells technology due to their ability to produce high electrical conductivity based on type of materials used. Mismatching of inappropriate materials and manufacture may lead to the inferior performance of PEM fuel cells. Hence, material develo...
Article
Full-text available
Composite materials have increasingly become crucial in manufacturing engineering products and producing commodity materials in the major industries including; automotive, aerospace, marine, construction, agriculture and health science. However, several improvements regarding the strength, dimensional stability and the cost of production are requir...
Article
Using metallic materials in automotive structures increases weight, fuel consumption and cost, therefore, certain trends have begun to use lightweight and cheaper materials. Fibre composites are used in automotive applications because they are stiff, lightweight and stronger than bulk material, as well as they have a comparable energy-absorbing cap...
Article
Full-text available
Currently, graphene is widely discussed among researchers due to its thermal flowability that can improve the properties of composite materials. This research used the addition of graphene in copper matrix with a combination of binders which are polyethylene glycol (PEG), polymethyl methacrylate (PMMA) and stearic acid. The use of graphene as a flle...
Article
Full-text available
The use of rice husks (RH) to reinforce polymers in biocomposites are increasing tremendously. However, the incompatibility between the hydrophilic RH fibers and the hydrophobic thermoplastic matrices leads to unsatisfactory biocomposites. Surface modification of the fiber surface was carried out to improve the adhesion between fiber and matrix. In...