Irman Abdul Rahman

Universiti Kebangsaan Malaysia | ukm · School of Applied Physics

Radiotherapy is an established therapy in cancer treatments that uses energy deposition directly into tumor tissue. With the introduction of radiosensitizers, invasive surgical and chemotherapy techniques can be avoided. Radiosensitizers with a high-Z base such as gold nanoparticles (AuNPs) are promising candidates for catalyzing tumor injury and s...

Air bawah tanah yang menjadi sumber kegunaan domestik kepada pengguna memerlukan penilaian air bawah tanah bagi mengelakkan berlakunya isu kesihatan. Kajian ini dijalankan untuk menilai kualiti air telaga tiub dalam aspek kandungan logam berat, bahan radioaktif semula jadi (NORM) dan bakteria patogen di Kelantan dan Pahang, Malaysia. Hasil kajian i...

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...

Purpose This paper aims to investigate the effect of different doses of gamma radiation on the micromechanical response (hardness properties and creep behaviour) of 96.5Sn-3.0Ag-0.5Cu (SAC305) solder alloys. Design/methodology/approach SAC305 solder pastes deposited on printed circuit boards (PCBs) were subjected to a reflow soldering process to f...

Electronic applications are now driving packaging technology that is equivalent to primary computer packages for the past 25 years. The electronic application currently shows an ascending market demand due to rapid development of smart and wireless component with mixed technologies that include digital microprocessors. In ensuring the quality of th...

Evaluating the mechanical properties of expanded polytetrafluoroethylene (ePTFE) is essential to measure its resistance to permanent deformation from an applied force. These mechanical ePTFE properties must be comparable to the properties of real tissue. Various hydrophilic comonomers 2-hydroxyethyl methacrylate (HEMA), N -isopropylacrylamide (NIPA...

The research focused on the synthesis of poly(tetrafluoroethylene) (PTFE) grafted with gold nanoparticles (AuNP). The Turkevich method, one of the common techniques of AuNP synthesis, was used to obtain an AuNP solution with a nanoparticle size of 20 nm. The PTFE-AuNP samples were subsequently irradiated and the absorbed doses were 0.5, 2, 5, 10 an...

The research focused on the synthesis of poly(tetrafluoroethylene) (PTFE) grafted with gold nanoparticles (AuNP). The Turkevich method, one of the common techniques of AuNP synthesis, was used to obtain an AuNP solution with a nanoparticle size of 20 nm. The PTFE-AuNP samples were subsequently irradiated and the absorbed doses were 0.5, 2, 5, 10 an...

The emergence of dust generated from the process of removal orthopedic cast materials pose a significant potential hazardous to respiratory health among the healthcare workers (HCWs) in the orthopedic casting room. The study was carried out to determine the total dust concentrations in the casting room were exposed to environmental and personnel. T...

Electronic packaging is the technology concerning to the establishment of electrical interconnections and it is a major discipline within the field of electronics engineering. Packaging of an electronics system should considered the protection from mechanical damage, cooling, radio frequency noise emission and protection from electrostatic charge....

Microelectronic packaging is frequently used in almost every application involving radiation-related industry. In the present work, the effect of the low dose gamma radiation on hardness and microstructural properties of Sn3Ag0.5Cu solder was explored using triboindenter test and optical microscope. The solder paste was placed onto the printed circ...

Despite its wide usage in medical applications, the hydrophobic nature of expanded polytetrafluoroethylene (ePTFE) prevents its osseointegration with surrounding tissues at the implant site, thus reduces its biocompatibility in regards as a polymeric implant. In altering the hydrophobicity property, surface modification of ePTFE with copolymer acry...

Objective: The study was carried out to determine the concentration of total dust from the orthopaedic casting materials exposed to personnel and working area. The determination of knowledge, attitude, and practices (KAP) regarding occupational safety and health (OSH) aspects also conducted. Increase dust concentration above the permissible limit (...

The extreme hydrophobicity of expanded polytetrafluoroethylene (ePTFE) hinders bone-tissue integration, thus limiting the use of ePTFE in medical implant applications. To improve the potential of ePTFE as a biomaterial, 2-hydroxyethyl methacrylate (HEMA) was grafted onto the ePTFE surface using the gamma irradiation technique. The characteristics o...

Gd2O2S:Eu3+ nanophosphors have been successfully synthesized using microwave irradiation and γ‐irradiation methods with polyvinyl pyrrolidone as a stabilizer. The physical and luminescence spectra were compared. The morphologies of both Gd2O2S:Eu3+ nanophosphors were in the hexagonal phase and mainly consisted of spherical nanostructures with diame...

This study elucidates a gamma irradiation-reduction approach in producing small gadolinium nanoparticles specifically gadolinium oxide nanoparticles coated with chitosan (GdNPs-Cs). Chitosan was used as a natural stabilizer and coating agent, whereas gadolinium (III) chloride hexahydrate (GdCl3.6H2O) was used as a precursor. The gadolinium nanopart...

This research was conducted to produce a limonene-based microemulsion system as vitamin C carrier. The microemulsion was produced using limonene as the oil phase, tween20 and tween80 as surfactants while propylene glycol, polyethylene glycol 400 and glycerol as co-surfactants. Pseudo-ternary phase diagrams were constructed to determine the microemu...

Red-emitting Gd2O2S:Eu3+ nanophosphors were successfully prepared using a microwave irradiation method followed by hydrogenation treatment. The optimum calcination temperature (900 ºC) was determined by thermogravimetric-differential scanning calorimetry. The X-ray diffraction results showed that all the samples consisted of the pure hexagonal Gd2O...

An ex-mining site has created an undesirable effect on the environment, such as the destruction of plants and contamination. Thus, this study was conducted to determine the natural radioactivity and heavy metal presence in the ex-mining site at Kolej University Islam Antarabangsa Selangor (KUIS) lake. Both parameters were measured using gamma spect...

Praseodymium ion, Pr3+ doped Gd2O2S nanophosphors were successfully synthesized via gamma irradiation route along with the heat treatment. The effect of the gamma irradiation (0-150 kGy) on the structural, morphology and photoluminescence properties of Gd2O2S:Pr³⁺ were characterized via X-ray diffraction (XRD), field emission scanning electron micr...

The effect of using different flux on wettability of Sn-Ag-Cu lead free solder were investigated. In this study, solder paste Sn-3.0Ag-0.5Cu (SAC305) was used by introducing two types of no-clean flux with different ingredients. The solders namely as SAC305-A and SAC305-B respectively. Then, the both solder paste manually printed on printed circuit...

Unilamellar liposomes composed of dipalmitoylphosphatidylcholine (DPPC) were prepared by the reverse-phase evaporation method and extrusion through a polycarbonate membrane filter. Liposomes at 0.7 mg/mL lipid concentration in deionized water were exposed to gamma irradiation at a dose in the range 0.5 to 25 kGy. Gamma irradiation of liposomes resu...

Knowledge has been known as a key element in developing support and perception by the public towards any new policy by the government, including the development of nuclear energy. The success of the policy is mainly dependent on public support which is related to the perception cultivated by the knowledge that is already held by the people. A publi...

Endophytes are organisms, often fungi and bacteria that live in living plant cells. These organisms reside in the living tissues of the host plant in a variety of relationships, ranging from symbiotic to slightly pathogenic. The endophytes may produce a plethora of substances that have potential to be used in modern medicine, agriculture and indust...

A novel gamma irradiation induced synthesis method of Gd2O2S:Eu³⁺ phosphors was investigated in the presence of cetyltrimethylammonium bromide (CTAB). The effect of irradiation doses (50-150kGy) on structural and morphology analysis as well as luminescence properties were characterized by X-ray diffraction (XRD), field emission scanning microscopy...

Production of amino acid based vesicles using sonication method was employed to determine its encapsulation efficacy towards gadolinium(III) nanoparticles as potential drug carrier. The sonication process involved precursor namely sodium N-lauroylsarcosinate hydrate with 1-decanol to produce vesicle in 92 wt.% of water. Gadolinium(III) nanoparticle...

Aging process makes our skin getting thinner and drier. Antioxidant based on nanoemulsion system is favourable because of its effectiveness. This study was conducted to develop nanoemulsion system based on palm olein as a carrier of vitamin E and the physicochemical behaviours of the system were studied. Palm olein as oil phase, polyoxyethylene (4)...

The pseudo-ternary phase diagram of oleic acid/cremophor rh 40/transcutol/water was prepared along the water dilution line at different ratio of surfactant to cosurfactant (Km). The optimum ratio of surfactant to surfactant was Km=2:1. The effect of addition limonene as a mixed oils phase on the system were done with the ratio of oleic acid to limo...

Gadolinium oxysulfide nanophosphors (Gd 2 O 2 S-NPs) have been successfully synthesized using γ -irradiation and hydrogenation treatment. The primary stage of Gd 2 O 2 S-NPs synthesis was carried out using various doses of γ -irradiation to form diverse sizes of Gd 2 (SO 4 ) 3 precursor, followed by hydrogenation treatment at 900°C for 2 hours to f...

Expanded poly(tetrafluoroethylene) (ePTFE) is used for many applications including in medical applications, such as for facial implants or as artificial vascular valves. However, due to its natural hydrophobic properties, it has limited efficacy in some applications. To be used as a facial implant, ePTFE must be biocompatible to the surrounding liv...

In this work, thermoplastic natural rubber (TPNR) composites were produced through melt blending method. Boron carbide (B4C) as filler was added into the polymer blend (TPNR) with different weight percent from 0% to 30% and the effect of different B4C contents on mechanical and thermal neutron attenuation properties of TPNR composites has been stud...

The variation on mechanical properties and crystalline structure of gamma-irradiated Sn-rich lead-free solder (SAC) were intensively investigated using nanoindentation and X-ray diffraction (XRD) techniques. Samples of solder on a printed circuit board (PCB) with copper substrate were irradiated at low dose (5 Gray) of gamma from Co-60 source. The...

The radio-photoluminescent glass dosimeter is applicable for measurement of gamma radiation dose using silver-doped phosphate glass. Therefore, investigations were carried out to establish the optimal composition range of phosphate glasses for radiophotoluminescence glass dosimeter. The basic physical and optical properties of the glasses, such as...

Graphene oxide has many applications such as in electronic devices, as storage energy device, biosensor, biomedical application, water purification, coating technology, as a composite and paper like materials. Hummer’s method is one of the most common methods used in synthesizing graphene oxide. Graphene is different in size and structure because o...

Vesicle formation by self-assembly in an aqueous mixture of zwitterionic carboxylate betaine surfactant and cholesterol was studied as a potential drug delivery nanocarrier. In this study, pyrene and 1,6-Diphenyle1-1,3,5-hexatrine (DPH) were applied as fluorescence probes that provides information on polarity and fluidity of the microenvironment, a...

Malaysia had considered nuclear energy as an option for future electricity generation during the 9th Malaysia Development Plan. Since 2009, Malaysia had implemented a number of important preparatory steps towards this goal, including the establishment of Nuclear Power Corporation of Malaysia (MNPC) as first Nuclear Energy Programme Implementing Org...

We report the research results of Ag-ZnO nanocomposites with different weight ratio of Ag:ZnO (0:10, 7:10 & 25:10) which were prepared by sonochemical method. The photocatalytic study of Ag-ZnO nanocomposites showed enhanced photocatalytic efficiency of methylene blue aqueous solution photodegradation compared with the pure ZnO nanoparticle under v...

The effect of high temperature storage of gold ball bonds towards micromechanical properties has been investigated. Gold wire from thermosonic wire bonding exposed to high temperature storage at 150 °C for 10, 100 and 1000 hours. The nanoindentation test was used in order to evaluate the high temperature storage effect on wire bonding in more detai...

A series of silver-activated phosphate glass was prepared by melt quenching method. The effect of silver nanoparticle addition on the phosphate glass microstructure, composition and chemical characteristics was investigated using x-ray diffraction, fourier transform infrared and photoluminescence spectroscopy. Other physical property such as densit...

The activity concentrations of naturally occurring radionuclides ²²⁶ Ra, ²³² Th, and ⁴⁰ K were determined in 30 agricultural and virgin soil samples randomly collected from Kedah, north of Malaysia, at a fertile soil depth of 0–30 cm. Gamma-ray spectrometry was applied using high-purity germanium (HPGe) gamma-ray detector and a PC-based MCA. The me...

Lead-free solders are important material in nano and microelectronic surface mounting technology for various applications in bio medicine, environmental monitoring, spacecraft and satellite instrumentation. Nevertheless solder joint in radiation environment needs higher reliability and resistance to any damage caused by ionizing radiations. In this...

Nanotribological properties have a significant impact on daily life. Ionic liquids (ILs) are becoming new favourable lubricants currently in researches. Addition of nanooxide materials in lubricants provide improvements to new technology. In this study, we determine nanotribological properties of BMIM+BF4 − IL addition of different amount of ZnO na...

Tobacco is a plant that is used as a recreational drug since the beginning of its use by the Native Americans. Now with the development of the tobacco industry, smoking has become a norm for the public in Malaysia. Trace elements in plants are mostly due to the uptake processes from the soils into the roots of the plants. The concentration of the e...

Nanovesicle structures are an important class of nanoparticle self-assembly offering potential drug delivery applications depending on vesicle shape, size, and stability. The influence of the sonication time and aging effects on size distribution and stability of the vesicles formed in aqueous mixtures of the Zwitterionic surfactant betaine and cho...

In this study, Bacterial cellulose (BC) grafted with Acrylic acid (AA) was prepared using Co60 γ-rays source (30 KGy). Although many samples were prepared, BC: AA with ratio of 1:1 labelled as A1 and 2:1 labelled as A2 gave the most significant results. Hence these particular ratios have been selected and further investigated. AA was proven grafted...

The main purpose of this research is to develop a cellulose derivative based microemulsion for transdermal delivery system. In this research, cellulose derivative used is carboxymethyl cellulose (CMC) that was converted from cellulose by etherification reaction and analysed by FTIR instrument. The degree of substitution (DS) for carboxymethyl cellu...

DPPC lipids are extensively utilized as a biomembrane model as they resembled biological cells and their significance in various physiological functions particularly in drug delivery system. The synovial joint fluid containing hyaluronic acid, proteins, proteoglycans and lipids. Hyaluronic acid (HA) is the most signified constituent in the synovial...

Titanium dioxide nanoparticle dispersions interaction with 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC) vesicles is reported in this paper. DPPC- TiO2 interactions were investigated using dynamic light scattering (DLS) and transmission electron microscopy (TEM) by focusing on the effect of the interactions on the surface charge, size and loca...

Radiosensitizer (RS) were applied prior to radiation therapy to increase the therapeutic efficacy. This is due to some cancer cells were resistance toward radiation by producing large amount of antioxidant enzyme to scavenges the free radicals. The amount of RS added prior to irradiation played an important role to increase the efficacy of treatmen...

This research aims to gauge the ability of gamma radiation to induce the reduction of graphene oxide to graphene. Graphene oxide powders were dispersed into a mixture of alcohol and deionized water, and the mixture was then irradiated with a60Co source using a GammaCell 220 Excel irradiator at absorbed doses of 0, 5, 15, 20 and 35 kGy. According to...

ZnO nanowhiskers were used for photodecomposition of methylene blue in aqueous solution under UV irradiation. The rate of methylene blue degradation increased linearly with time of UV irradiation. 54% of degradation rate was observed when the ZnO nanowhiskers were used as photocatalysts for methylene blue degradation for 80 min under UV irradiation...

The mechanical properties of gold wire bonding are subjected to thermal cycling (TC) test has been investigated. Gold wire bonding was experienced to temperature cycle of (-65) °C to 150 °C for 10, 100, and 1000 cycles. In order to determine the mechanical properties of gold wire, nanoindentation test was performed. A constant load nanoindentation...

Coral-spherical-shaped of copper oxide nanoparticles have been successfully synthesized with different ratios of triethanolamine:ethylenediamine surfactant under ultrasonic condition. By controlling the amplitude of the ultrasonic radiation and concentration of metal salt precursors and surfactant, the formation of CuO nanospheres was obtained. Ene...

DPPC lipids are the major component constituting the biological membrane, and their importances in various physiological functions are well documented. Hyaluronic acid (HA) in the synovial joint fluid functions as a lubricant, shock absorber and a nutrient carrier. Gamma irradiation has also been found to be effective in depolymerizing and cleaving...

Many of the cellular process depend on the ability of the membrane to separate areas while allowing exchange and tightly regulated transport of material within and across the membrane to occur, which is the driving principle behind cell communication. The complexity of biological membranes has motivated the development of a wide variety of simpler...

The morphology of vesicles system with defined particle size and shape is one of interest in our technical applications. Here we have used dynamic light scattering technique and transmission electron microscopy for structural characterization of N-dimethylglycine Betaine with 5-cholesten-3β-ol vesicles in aqueous solutions. An isotropic one phase r...

The purpose of the study is to determine the relationship between radiation-induced complications with dosimetric and radiobiological parameters for prostate cancer patients that underwent the conformal radiotherapy treatment. 17 prostate cancer patients that have been treated with conformal radiotherapy were retrospectively analysed. The dosimetri...

Cancer cells which are large in size are resistant towards radiation therapy due to the presence of large amount of anti-oxidative enzymes and hypoxic cancer cells. Thus radiosensitizer agents have been developed to enhance the therapeutic effect of radiotherapy by increasing the sensitivity of these cancer cells towards radiation. This study is...

The effect of gamma radiation on the mechanical and structural properties of gold ball bonds was investigated. Gold wires from thermosonic wire bonding were exposed to gamma rays from a Cobalt-60 source at a low dose (5 Gy). The load-depth curve of nanoindentation for the irradiated gold wire bond has an apparent staircase shape during loading comp...

Catanionic system using anionic sodium bis-(2ethylhexyl)sulfosuccinate (AOT) and cationic cetyltrimethylammonium bromide (CTAB) is studied. The system is prepared by addition of CTAB solution to a prepared AOT solution until slight anionic-rich catanionic phase is produced. Catanionic system consists of the mixture of different types of surfactants...

Effect of gamma radiation (1.33 MeV) and high temperature storage of semiconductor package towards micromechanical properties has been investigated. The in-house fabricated Quad Flat No Lead was exposed to gamma radiation with the dos of 5 Gy. Afterwards, high temperature storage was performed at 150 °C for 10, 100 and 1000 hours. Subsequently, the...

Universiti Kebangsaan Malaysia offered an undergraduate degree program in Nuclear Science since 1980 and the programme has undergone several modifications due to changes in national policy and priority. The programme covers nuclear sub-disciplines such as nuclear physic, radiobiology, radiochemistry, radiation chemistry and radiation safety. The ra...

Vesicles has been developed and studied to be used as a medium to transport radiosensitizer in treating cancer cells by increasing its sensitivity effectively towards the radiation given during radiotherapy. This study was conducted to investigate the effect of gamma radiation on amino acid-based vesicle carrying radiosensitizer. Amino acid based v...