Akil Hazizan
Universiti Sains Malaysia
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Featured researches published by Akil Hazizan.
Key Engineering Materials | 2011
Mohd Firdaus Omar; Akil Hazizan; Zainal Arifin Ahmad
Strain rate sensitivity and dynamic mechanical properties of polymeric materials are affected to a certain extent especially by the rate of loading. However, there is limited number of works reported on that particular issue. Therefore, the paper presents on static and dynamic mechanical properties of various polymeric materials across strain rate from 10-2 to 10-3 s-1. The specimen were tested using universal testing machine (UTM) for static loading and a conventional split Hopkinson pressure bar (SHPB) apparatus for dynamic loading. From the results, the compression modulus and compressive strength of all tested specimen increased significantly with increasing strain rates. In addition, positive increment in terms of strain rate sensitivity was recorded for all tested polymers over a wide range of strain rate investigated. Meanwhile, the thermal activation volume has decreased as increasing strain rate. Of the three polymers, polypropylene shows the highest strain rate sensitivity at static region. On the other hand, at dynamic region, polycarbonate shows the highest strain rate sensitivity than that of polypropylene and polyethylene.
Advanced Materials Research | 2012
Muhammad Helmi Abdul Kudus; Akil Hazizan; Siti Shuhadah Md. Saleh
Minerals are always used as filler material in polymer composite application purposely to reduce the price. In order to optimize the use of mineral fillers instead of price reduction, there were several approaches that have been done such as surface treatment, finding suitable coupling agent, and etc. The study on hybridization of minerals with carbon nanotubes (CNT) are rare to be found. CNT has received great attention from researchers due to their superior properties to be used in many applications. Hybridizing CNT with minerals proposes potential fillers for polymer composite. In this study, chemical vapor deposition (CVD) technique was used to synthesize the CNT-minerals hybrid compound. A mixture of CH4/N2 was used as the carbon source and nickel as the metal catalyst for the growth of CNT hybrid compound. Three different types of minerals were used namely talc, muscovite and CaCO3 are used to synthesize the MWCNT-talc, MWCNT-muscovite and MWCNT-CaCO3 hybrid compound. In short, the process involved precipitation of mineral filler with nickel salt. The process was followed by calcinations and reduction of the catalyst, and methane decomposition. The produced hybrid compounds were then analyzed.
Key Engineering Materials | 2011
Mohd Fadli Ahmad Rasyid; Akil Hazizan; Jamaliah Sharif
Polypropylene- layered silicate nanocomposite based on muscovite was prepared via melt compounding. Muscovite was organomodified with cetyltrimethylammoniumbromide (CTAB) by using different filler loading. The effects of muscovite content on mechanical and morphology properties were evaluated. Analysis of test data showed that the mechanical properties increased with an increase in filler loading up to a threshold of 3 wt%; thereafter the material properties were degraded. The enhancement of properties attributed to the formation of intercalated and exfoliation nanocomposite structure at these loadings of clay. At higher filler loading, degradation in mechanical properties maybe attributed to the formation of agglomerated clay tactoids.
Advanced Materials Research | 2012
Saad Omar Alsharif; Akil Hazizan; Nasser Abbas Abd El-Aziz; Zainal Arifin Ahmad
The aim of this study is to evaluate the radiopacity of silica (SiO2) and zirconia (ZrO2) particles dispersed in a bisphenol-a-glycidyl methacrylate (Bis-GMA) as a base resin and triethylene glycol dimethacrylate (TEGDMA) as a diluent. The fillers were mixed separately with bis-GMA/TEGDMA monomers, in proportions of 40, 50 and 60 wt.%. A resin matrix containing 0 wt.% filler was used as the control composition to evaluate the effect of filler loading on the radiopacity. Samples of the composites with 2.5 mm thickness were compared their radiopacity with the same thickness of the standard aluminum plate. The radiopacity of both resin matrix/SiO2 and resin matrix/ZrO2 composites increased gradually as the filler loading increased. The resin matrix/ZrO2 composites possessed radiopacity higher than the standard aluminum plate. The increase of filler loading showed highly significant differences in the radiopacity as tested by ANOVA (P = 0.000).
Advanced Materials Research | 2012
Siti Shuhadah Mohd Saleh; Akil Hazizan; Muhammad Helmi Abdul Kudus
Multiwalled carbon nanotubes/dolomite (MWCNT/dolomite) hybrid compound was synthesized using the Chemical Vapour Deposition (CVD) technique. The catalyst was prepared via the co-precipitation method. The process involves the drying of the precipitate followed by calcination at 900°C.Upon completion of calcinations process, the reduction process was carried under H2 at 400°C and growth in a CH4/N2 gas mixture at 800°C for 30 minutes The reduction process was carried out under H2 and growth in a CH4/N2 gas mixture at 800°C for 30 minutes. The morphological assessment using Field Emission Scanning Electron Microscope (FESEM) showed that the CNT was successfully grown on dolomite particle. High Resolution Transmission Electron Microscope (HRTEM) micrograph further confirmed the presence of MWCNT with varied length and geometry on dolomite surfaces, supported the formation of MWCNT on the dolomites particle.
Key Engineering Materials | 2011
Muhammad Helmi Abdul Kudus; Akil Hazizan; Mohamad Hasmaliza
This work focuses on synthesis of MWCNT-alumina hybrid compound via methane decomposition process using nickel catalyst. The catalysts prepared through in situ process by using nickel salt and aluminium powder which then calcined at 900oC followed by methane decomposition process to grow MWCNT on alumina surface. The Scanning Electron Microscopy (SEM) and High Resolution Transmission Electron Microscopy (HRTEM) images confirmed the formation of MWCNT with homogenous dispersion on alumina particles.
Advanced Materials Research | 2011
Firdaus Omar Mohd; Akil Hazizan; Zainal Arifin Ahmad
Filler-related characteristic such as particle size, shape and geometry are essential factors that need to be considered during the evaluation of the material’s performance especially in the area of particle filled composites. However, there is limited number of works are reported on this particular issue under high strain rate condition. Based on this concern, the paper presents an experimental results on the effect of particle sizes towards rate sensitivity and dynamic compressive properties of polypropylene/silica nanocomposites across strain rate from 10-2 to 10-3 s-1. The composite specimens were tested using universal testing machine for static loading and a compression split Hopkinson pressure bar apparatus for dynamic loading. Results show that, the stiffness and strength properties of polypropylene/silica nanocomposites were affected by the size of silica particles. However, the magnitudes of changed are somehow different between micro and nanosizes. On the other hand, particle size also plays a major contribution towards sensitivity of the polypropylene/silica nanocomposites where the smaller the reinforcement sizes, the less sensitive would be the composites. Overall, it is convenience to say that the particle size gives significant contribution towards rate sensitivity and dynamic mechanical properties of polypropylene/silica nanocomposites.
international conference functional materials and metallurgy | 2015
A.A. Sinar; Z. Firuz; M.A. Nur Azni; A.Z. Nur Hidayah; Akil Hazizan; H.A. Sahrim
This paper describes the effect of multi walled carbon nanotubes (MWCNTs) on the properties, especially the strength properties of rigid polyurethane (PU) foams produced from palm oil based polyol (POP) and methylene diphenyl diisocyanate (MDI). The foam composites in the ratio of 1:1.1 (wt. %) mixed at speed 2000 rpm. The addition of MWCNTs into PU foam are varies from 0 wt. % to 3 wt. %. The properties evaluated were compressive strength, density and energy absorption. Compressive strength of PU foam composites with 0.5% of MWCNTs showed the highest value 1.162 MPa of compressive strength compared to other foam composites. It was proved by modeling displacement nodal magnitude using NX Software (version 8.5). The density was increased 15.69 % with addition of 0.5 % MWCNTs into the PU foam. Increasing the amount of MWCNTs in PU foam was found to improve the energy absorption from 22.89 J for pure PU to 24.53 J for foam composites with 3 % MWCNTs.
Materials Science Forum | 2014
A.A. Sinar; Mohd Azizan Nur Azni; Firuz Zainuddin; Akil Hazizan; M.S. Siti Shuhadah; H.A. Sahrim
Polymer nanocomposites have a great interest because of special properties of carbon nanotubes (CNTs) as excellent for mechanical, chemical, electrical and thermal properties. CNTs are categorized as single walled nanotubes (SWCNTs) and multi walled nanotubes (MWCNTs). The largest challenge is how to achieve uniform distribution of CNTs within the polymer matrix due to CNTs tend to agglomerated because of their hydrophobic nature. The resulted from CNTs bundles or aggregates reduced the mechanical performance of the final polymer nanocomposites. The surface of the CNTs must be modifiy to reduce the hydrophobicity and improved the interfacial adhesion to a bulk polymer. This paper reviewed the two (2) treatments of CNTs such as physical methods and chemical methods to obtain a better dispersion and enhance the CNTs properties in polymer nanocomposites.
Advanced Materials Research | 2013
Siti Shuhadah Mohd Saleh; Akil Hazizan; Ramdziah Md. Nasir; Herza Hasmi
Carbon nanotube (CNT) reinforced polymer composites are of great interest, because their superior properties can produce composite materials with high strength, light weight, and multifunctional features. In this work, the thermal and tribological properties (wear) of Phenolic/CNT-Alumina Hybrid composites were studied. The CNT-alumina hybrid (chemically hybrid) was produced via Chemical Vapour Deposition (CVD). The Phenolic/CNT-Alumina Hybrid composites were fabricated using hot mounting moulding. The tribological properties were monitored using a Ducom TR-20 pin-on-disk tester, under dry sliding conditions. The thermal conductivity was measured using the Transient Plane Source (TPS) method, using a Hot-DiskTM Thermal Constant Analyzer. The results show that CNT-Alumina hybrid enhanced the thermal and tribological properties of the polymer composites.