Aznan Fazli Ismail

Aznan Fazli Ismail
Universiti Kebangsaan Malaysia | ukm · Nuclear Science Program

P.hD (Nuclear and Quantum Engineering)

About

65
Publications
15,410
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673
Citations
Citations since 2016
55 Research Items
646 Citations
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2016201720182019202020212022050100150200
2016201720182019202020212022050100150200
2016201720182019202020212022050100150200

Publications

Publications (65)
Article
Full-text available
The natural zeolite has been modified with sulphate and phosphate. The adsorption of thorium from the aqueous solutions by using the natural and modified zeolites has been investigated via a batch method. The adsorbent samples were characterized by X-ray Diffraction (XRD), N2 adsorption–desorption (BET), Fourier transform infrared (FTIR), field emi...
Article
Full-text available
This paper presents an extensive radiological mapping of the Doguwa tin mining areas of Kano, Nigeria, where uranium has been found in quantities for commercial mining. The goal of this study is to provide detailed radiological information that could be used as a reference in monitoring any future environmental changes that may result from other na...
Article
Full-text available
Mining of minerals increases the risk of exposure to natural radionuclides by exposing them to the outer surface of the earth. The risk increases when these radionuclides are migrated into the bodies of water that have been used for drinking purposes. This work was carried out to assess the radionuclides concentration in drinking water from tin min...
Article
The end product of tin tailing processing, specifically heavy minerals, has paved the way for waste utilization contributed by the tin mining and extraction industry in Malaysia. However, the 1994 exemption order of this specific processing industry in complying with the Atomic Licensing Act 1984 has directly impacted plant workers and environmenta...
Article
Solid oxide fuel cells (SOFCs) are eco‐friendly and yet highly efficient power generation devices. However, SOFCs face some commercial issues with durability, reliability, sustainability, and fabrication costs. In recent years, a unique design idea of symmetrical cell configuration of SOFCs with similar anode and cathode materials, commonly known a...
Article
To improve the performance of the thorium fuel, the duplex fuel potential for the micro-sized high-temperature reactor (HTR) using TRISO fuel has previously been investigated. The objective of this work is to expand on past research by delving deeper into several crucial components of the microheterogeneous thorium-uranium TRISO fuel compact. The M...
Article
Full-text available
The UO2 seed and ThO2 blanket in the duplex fuel pellet were originally designed to increase the breeding rate of fissile materials in light water breeder reactors. In this configuration, most of the fission reactions occur in the seed portion, resulting in high temperature of the seed region. As such, duplex feel pellet could possibly be advantage...
Article
Full-text available
The tin tailing processing industry in Malaysia has operated with minimal regard and awareness for material management and working environment safety, impacting the environment and workers in aspects of radiation and heavy metal exposure. RIA was conducted where environmental samples were analyzed, revealing concentrations of ²²⁶Ra, ²³²Th and ⁴⁰K b...
Conference Paper
The thorium concentration in monazite can be as high as 6-15 wt. % and it has the potential to be used in the nuclear power system as fuel. Thorium is predominantly present in the form of thorium orthophosphate (Th3(PO4)4) along with the other rare-earth phosphates [Ce, La, Nd, Pr, Sm (PO4)] in the monazite mineral. The alkaline decomposition metho...
Article
Solid oxide fuel cell (SOFC) is known for its higher efficiency compared to the other types of fuel cells. Even so, the application of SOFC is hindered by the operational temperature of 800 °C–1000 °C. Lowering the operational temperature below 1000 °C of SOFC becomes the major concern to allow wider applications as well as to increase the durabili...
Article
The electron transport layer (ETL) plays a pivotal role in polymer solar cell (PSC) for improving the efficiency. TiO2 is widely used as ETL, but it has low electron mobility and poor conductivity. Here, we demonstrated the incorporation of the novel γ-radiated g-C3N4 additive into the TiO2-based ETL polymer solar cell. The γ-radiated g-C3N4 tunes...
Article
Aerosol-assisted chemical vapour deposition (AACVD) is capable of producing WO3 film with good optical and electrical properties for photoelectrochemical (PEC) water splitting. However, the conventional AACVD method is time-consuming because post-annealing treatment is usually required after WO3 film was deposited under nitrogen flow. Therefore, we...
Article
Comprehensive radiological survey and evaluation of heavy metal contamination were conducted in Chini Lake, which has been awarded a pristine title of Biosphere Reserve. The concentrations of 226Ra, 228Ra, and 40K in sediments exceeded the average soil in Malaysia. Besides, the concentration of As, V, and Zn in sediments were greater than the Dutch...
Article
In this study, a new insight into the doping engineering with nuclear fuel (ThO2) was performed and applied in photoelectrochemical (PEC) water splitting. The successfully synthesized g-C3N4/ThO2 (∼5.8%) via thermal treatment and g-C3N4 polymerization (precursor: Urea, 30 min; 520 ˚C) manifested a remarkable and superior photocatalytic activity. Th...
Article
Full-text available
Sandy texture soil, a major problem for agriculture requires structure and capacity improvements. However, utilization of soil conditioner may arrest this problem. This research was carried out to investigate the accumulated levels of metal ions and radionuclides in water, soil and plants following phosphogypsum organic (PG organic) added to a sand...
Book
Full-text available
current to enhance the efficiencies across the Dye-semiconductor interface. Electron transfer is a basic process in dye-sensitized solar cells and many electronic devices. The electronic current evaluated for Tris (8-hydroxy) quinoline aluminium (Alq3) molecules contact with TiO% semiconductor via quantum scenario model for the donor-acceptor sy...
Article
This paper presents the neutronic analysis of a tristructural isotropic (TRISO)-duplex fuel loaded into the high-temperature reactor (HTR) prismatic fuel block designs for a seed-and-blanket (S&B) reactor model. The selected fuel block design is the simplified model of a representative fuel configuration for the gas turbine–module helium reactor (G...
Article
The present study aims to investigate the optimum parameter in producing high-purity thorium dioxide (ThO 2) using Di-2-ethylhexyl phosphoric acid (D 2 EHPA) and Aliquat-336 as solvent materials. The extraction and purification process was performed using [Th-RE](OH) 4 compound which was selectively precipitated from the monazite leach solution. Se...
Article
Photoelectrochemical (PEC) water splitting is a green and sustainable approach capable of driving mass hydrogen production in the future. To realize this vision, development of a well-performing photoelectrode is highly demanded. In this comprehensive study, electrodeposition technique was applied for fabricating BiVO4 films by regulating the depos...
Article
Graphitic carbon nitride (g‐C3N4) is a potential additive that can alter the polymer solar cells (PSC) performance. Hereby, we report a novel strategy by applying γ‐radiated g‐C3N4 as additive into bulk heterojunction polymer solar cell (BHJ‐PSC). The incorporation of γ‐radiated g‐C3N4 into the active layer P3HT:PC61BM augments the efficiency of BH...
Article
Full-text available
Rare-earth (RE) industries generate a massive amount of radioactive residue containing high thorium concentrations. Due to the fact that thorium is considered a non-economic element, large volume of these RE processed residues are commonly disposed of without treatment. It is essential to study an appropriate treatment that could reduce the volume...
Article
In this present study, thorium ion [Th(SO4)3²⁻] was removed from aqueous sulphate medium using fabricated activated carbon-based electrodes (CBE). The thermal cross-linking technique was used to synthesize the CBE. Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) technique, X-ray photoelectron spectroscopy (XPS) and field emi...
Article
Full-text available
The duplex fuel pellet includes UO2 components as seed and ThO2 blanket, originally designed to increase the breeding rate of fissile materials in light water breeder reactors. However, the seed portion alone concentrates most of the energy released from the fission reaction, which can make the seed temperature too high. The duplex fuel potential f...
Article
Full-text available
Monazite is a phosphate mineral that contains thorium (Th) and rare earth elements. The Th concentration in monazite can be as high as 500 ppm, and it has the potential to be used as fuel in the nuclear power system. Therefore, this study aimed to conduct the techno-economic analysis (TEA) of Th extraction in the form of thorium oxide (ThO2) from m...
Preprint
Full-text available
Background Predominant sandy, Beach Ridges Interspersed with Swales (BRIS) soil is a problematical soil for agriculture. It requires structure and capacity improvement due to its weak composition, low water retention capacity and high leaching of nutrients. However, there are hopes to improve it using different fertilizers in combination with organ...
Article
Rare-earth (RE) extraction activities in Malaysia produce an average of 75000 tonnes of Water Leach Purification (WLP) residue containing an estimated 106 tonnes of thorium that leads to negative perception and concern among the public especially related to the environmental and radiological aspects. The main challenge to separate thorium from the...
Article
This paper presents a systematic review of the micro-modular thorium-fueled high temperature reactors (HTR) loaded with duplex fuel pellet design. Specifically , each unique criterion of the design is discussed separately in an attempt to understand the combined advantages of the proposed reactor. Micro modular HTRs have great potential as a source...
Article
Understanding the effect of electrochemical reaction on a particular material at the nanoscale level is essential for the application of solar conversion technology. Herein, electrochemical cyclic voltammetry (CV) treatment was applied on the α-Fe2O3 thin films by varying the number of cycles between 0 and 100. The thorough investigation provides i...
Article
Development of semiconductor heterojunction is a promising and yet challenging strategy to boost the performance of photoelectrochemical (PEC) water splitting. This paper describes the fabrication of heterojunction photoanode by coupling α-Fe2O3 and g-C3N4, via aerosol-assisted chemical vapour deposition (AACVD) followed by spin coating technique a...
Conference Paper
Full-text available
Activated carbon electrode has been tested as a potential sorbent for removal of Th ions from the actual wastewater sampel by electrosorption technique. The objective of this research is to investigate the performance of activated carbon electrode for remediation of real thorium sample. Adsorption of thorium ion by activated carbon electrodes was i...
Article
Full-text available
The level of natural radioactivity and radiological risks attributed to forty (40) different ceramic tiles using gamma-ray spectroscopy employing high-purity germanium detector were studied. The average activity concentrations of 226Ra, 232Th and 40K range from 37.5 ± 0.3 to 215.9 ± 5.8 Bq kg−1, 42.2 ± 0.1 to 181.8 ± 3.8 Bq kg−1 and 349.5 ± 25 to 1...
Article
The activity concentrations of natural radionuclides from 80 samples of Malaysia's building materials sourced from either manufacturers or local suppliers were studied using high-purity germanium (HPGe) detector. The radiological hazards associated with building materials under study were evaluated by calculating radium equivalent activity (Ra eq)....
Article
In this study, 52 samples of ceramic materials were studied for 226Ra, 222Rn, 232Th and 40K natural radionuclides using high-purity germanium detector and relevant radiological hazards parameters were also appraised. Furthermore, the long-term variations of the total effective dose equivalent (TEDE) and effects of wall thickness on TEDE were establ...
Article
This paper reports the successful exfoliation of nanosheets from bulk g-C3N4 by using urea as a precursor. The alteration from bulk g-C3N4 powder, changed its semiconductor arrangements such as the optical absorption, chemical bonding, and topography images. A slow direct low thermal treatment (∼40 °C, 24 h) was proposed as a formation of a thinner...
Article
Full-text available
Thorium affects human health and causes environmental issues. The concentration of thorium in the environment may increase due to waste that is produced from human activities like mining, rare-earth extraction, and others. If this waste is not handled properly, thorium may leak and cause water contamination. This review summarises the methods of th...
Article
3-dimensional (3D) nanostructures have gained broad attention in the field of microelectronics and nanotechnology owing to their fascinating properties and potential for novel applications. To enable successful fabrication of the nanostructure, deep understanding on their growth mechanism is an absolute prerequisite. In this study, thin film of hem...
Article
Full-text available
In this study, g-C3N4 was synthesized from urea and then was fabricated into thin films using spin-coating followed by post- annealing in the temperature range of 150 °C–500 °C. Use of methanol rather than water as the solvent for preparation of the spin coating suspension proved to be beneficial. The chemical bond structure, morphology, and optica...
Article
The activity concentrations of 226Ra, 232Th and 40K radionuclides from common building materials used by Malaysian people for construction purposes were studied using High-Purity Germanium (HPGe) detector. The measured activity concentrations of the aforementioned radionuclides range from 10 ± 1 Bq kg−1 (limestone) to 155 ± 61 Bq kg−1 (feldspar), 1...
Article
Comprehensive experimental and density functional theory simulations have been performed for the enhanced photoelectrochemical performance of gamma irradiated g-C3N4 and its heterojunction with BiVO4. The structure and morphology of g-C3N4@BiVO4 as a heterojunction were analyzed and verified from the correlation of experimental and theoretical data...
Article
Full-text available
In this study, the activity concentrations of 226Ra, 232Th, 222Rn, and 40K, emanation fractions (P), equilibrium equivalent concentration (EEC), and mass exhalation rates (Em) of radon released from building materials used in Malaysia were studied using gamma-ray spectrometer with HPGe detector. Radiological parameters [activity concentration index...
Article
Full-text available
The activity concentrations of 226Ra, 232Th, and 40K from 102 building materials samples were determined using a high-purity germanium (HPGe) detector. The activity concentrations were evaluated for possible radiological hazards to the human health. The excess lifetime cancer risks (ELCR) were also estimated, and the average values were recorded as...
Article
Full-text available
This study investigated the level of natural radioactivity and radiological risks of 40 different ceramic tiles through gamma-ray spectroscopy using a high-purity germanium detector. The calculated activity concentrations were evaluated to determine their potential radiological risks to human health. Furthermore, the activity concentrations were su...
Article
Full-text available
The present study aims to investigate the fluorination of thorium oxide (ThO 2 ) by ammonium hydrogen difluoride (NH 4 HF 2 ). Fluorination was performed at room temperature by mixing ThO 2 and NH 4 HF 2 at different molar ratios, which was then left to react for 20 days. Next, the mixtures were analyzed using X-ray diffraction (XRD) at the interva...
Article
Full-text available
Thorium ( ²³² Th) is four times more abundant than uranium in nature and has become a new important source of energy in the future. This is due to the ability of thorium to undergo the bombardment of neutron to produce uranium-233 ( ²³³ U). The aim of this study is to investigate the production cost of thorium oxide (ThO 2 ) resulted from the thori...
Article
Full-text available
This research reports the annual effective dose of dwellers based on the finding of natural radioactivity concentrations in Malaysian tiles. A total of 30 tiles samples obtained from the manufacturer or bought directly from local hardware store. Natural radioactivity was analyzed using gamma spectrometry system for 12 h counting times. The activity...
Conference Paper
Full-text available
The activity concentration and radiological risk of commonly used flooring materials (tiles) in Malaysia were studied. The natural radionuclide concentrations of 226Ra, 232Th and 40K were measured using high-purity germanium detector. The average concentration of 226Ra, 232Th and 40K in the samples were 65.75±1.1 Bq kg−1, 61.92±1.43 Bq kg−1 and 617...
Article
Full-text available
To support the use of nuclear power as a sustainable electric energy generating technology, long-term supply of uranium is very important. The objective of this research is to investigate the use of new adsorbent material for cost effective uranium extraction from seawater. An activated carbon-based adsorbent material is developed and tested throug...
Article
Full-text available
Previous studies have shown that the natural radioactivity contained in building materials have significantly influenced the dose rates in dwelling. Exposure to natural radiation in building has been of concerned since almost 80 % of our daily live are spend indoor. Thus, the aim of the study is to assess the radiological risk associated by natural...
Article
Full-text available
Modern life style requires people to spend most of their time indoors either in a house or in the workplace. Most modern buildings are made from soil based material which may consist of low concentration of naturally occurring radioactive materials (NORM). It is known that one of the daughters of natural uranium is 226Ra which eventually produce ra...
Article
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One of the most important aspects of Human Resource and Manpower Development is in Education and Training. Universiti Kebangsaan Malaysia (UKM), being the only University in Asia offering an undergraduate programme on Nuclear Science has been singled out in the Malaysia National Nuclear Policy in the Human Capital Development. The policy was used i...
Article
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We investigated in this work the two-neutron halo nuclei of 14 Be. The cluster model was used in the present work to study the properties of a three-body system. The three-body system described depended on the Jacobi coordinates using two configurations: the T-configuration and the Y-configuration. In this work, the binding energy, the root-mean-sq...
Article
Full-text available
The two-neutron halo nucleus 11 Li has been investigated in this work. Jacobi coordi-nates is used to describe the three-body system, using two configurations that are the T-configuration and Y-configuration. The calculations have been calculated based on a cluster model. The 11 Li nucleus is considered as three-body system core (9 Li) + n + n. The...
Article
Full-text available
The use of building materials containing high concentration of naturally occurring radioactive material (NORM) may result in the increase of radiation dose rate inside the building. The assessment of radiological hazard in building materials is necessary due to the concern of radiological impact to its dwellers. Thus, the objectives of this study w...
Article
Full-text available
Besides bricks, granites and sands cement is one of the main components of building materials Cement is made from a combination of rocks and soils which is known to contain natural radioactivity. The objectives of this study were to determine the level of natural radioactivity and associated radiological hazard caused by natural radioactivity in Ma...
Article
Full-text available
The presence of natural radioactivity in materials used in building constructions results in external and internal radiation exposure to the dwellers. Sand is one of the main components in building construction beside cements, granites and bricks. Thus, this research has been carried out in order to investigate the levels of natural radioactivity a...
Article
Full-text available
ABSTRAK Selain daripada batu-batu kecil, batu kerikil dan pasir, simen merupakan salah satu bahan penting untuk membina bangunan. Simen diperbuat daripada campuran batuan dan tanah dan diketahui secara semulajadinya mengandungi radionuklid tabii. Kajian ini bertujuan untuk menentukan aras keradioaktifan tabii serta menilai hazard sinaran yang berpu...

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