[en] CNT materials are widely used in many field such as medicine, electrical and electronic, construction, industry, military and others. The research study on this both CVD technique and gamma-rays technique conducted in Malaysian Nuclear Agency in preparing the CNT is potentially applicable in the provision of advanced materials.

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No abstract available

[en] Electrophoretic deposition (EPD) is well-known as one of versatile electrochemical process which consist two-step processes for depositing coatings from suspended particles and polymer molecules. EPD requires the homogeneous dispersion of charged particles in a suspension medium. As prerequisite step, the stable suspension should be formed by assisting the ultrasonic irradiation. Generally, when applying an electric field, the particles move towards the oppositely charged substrate material, where they deposit to form a coating on the surface of the substrate. In the standard EPD process (lab scale), two electrodes, the working electrode (substrate material) and the counter electrode are immersed in the suspension. In pilot scale, the fully automated system can be consist including suspension compartment with ultrasonic transducer, electrodes in-line system, programmable AC/DC power supply, washing system, drying/ annealing system and others. The advantages of EPD are rather simple equipment, the flexibility in substrate shape/ dimension and coating materials choice as well as the ability to easily control the homogeneity and thickness of the coatings. Pilot scale deposition facilities can involve semi-automatic operation with accurate deposit thickness control. Suspension and solution handling systems can be either water-based or solvent-based, and are specially designed to remove air bubbles that can cause defects in the product. Uniform or graduated thickness as required is done by control of electric field strength and fluid flow to avoid stagnation points This promising technique can be suitable choice from other techniques which more expensive, less efficient and harmful to environment. The hybrid nanocomposites have been proven to exhibit superior properties than the conventional materials. To make full use of the properties derived from particles, it is important to control the arrangement of particles with high packing density in hybrid nanocomposites. The Ultrasonic assisted Electrophoretic Deposition has been found to enable desired particle arrangement and packing density with various shapes. The widely fabrication and coatings application on targeted materials/surfaces such metals, fibres and glass which can be efficiently utilized. Besides, with the implementation of Gamma irradiation as replacement for chemical treatment and EB irradiation for enhancement of conductivity and uniformity of the coatings, the fabricated hybrid nanocomposites will be enhanced materials and can contribute efficiently. The application can widely covered in industries, especially in medical, automotive, energy, and environment, even have future prospects for military and aerospace. (author)

[en] UV curable organic-inorganic hybrid materials synthesized from urethane acrylate resin and silica filler had been developed for scratch property. The surface of the nano silica was chemically modified to improve its chemical interaction within the urethane acrylate matrix. The modification was undertaken by applying vinyltrimethoxysilane (VTMOS) that acted as a coupling agent to produce organophilic silica namely siloxane methacrylate (SIMA). The percentages of the silica particles in the UV curable hybrid formulations were varied from 5%, 10%, 15%, 20% and 25% respectively. The disappearance of methoxy groups in VTMOS was shown by FTIR spectra. The results obtained from TGA analysis, scratch test and SEM clearly showed that the physical properties of the hybrid coatings were significantly improved and well grafted between silica and urethane resin. (author)

[en] Epoxidized Palm oil liquid acrylate (EPOLA) was introduced with several commercial monomer and oligomer to produce UV spot over print varnish (OPV). The percentage of EPOLA in curable formulation has varied in order to study the influence of EPOLA on coating film properties. The performance of coating film was investigated by doing several mechanical analyses such as adhesion and pencil hardness test. Meanwhile Gardner test were used to measure the glossy of the OPV film. (author)

[en] Full-text: UV-curable coating is a green technology which has been rapidly commercialised in many applications and its demand has been rising due to global concerns over environmental protection issues. The technology has been considered environmental friendly as its eliminates the emission of volatile organic compounds with short time curing. The vegetable oils such as palm oil, jatropha oil, soybean, sun flower, linseed, castor oil have been employed for the preparation of acrylate resin to impart flexibility, hardness and chemical resistance. The use of renewable resources combined with environmentally UV-curable technology provides a green solution to the stricter regulations in the coating industry. This paper presents comparison product of epoxidized palm oil acrylate (EPOLA) and epoxidized Jatropha oil acrylate (EJOLA). The reaction was confirmed by several analytical data for example, oxirane oxygen content (OOC), acid value (AV) and IR spectrophotometer method. The acid value of the resin was determined using ASTM D0974 whereas the OOC content was analysed using AOCS Tentative Method Cd-957. The kinetics of the acrylation reaction were monitored throughout the AV and OOC of the reaction mixture. The AV and OOC decreases during the acrylation process and remain constant suggested that ring opening reaction was successfully completed. The obtained of epoxy acrylate was investigated by FTIR which reveals that acrylates resin was successfully synthesized with the presence of acrylate peaks at the absorption of 1632 and 810 cm^-1 respectively and also the absence of oxirane at the absorption peak at 834 cm^-1. The properties of the cured films were investigated by using pendulum hardness tester and gel content analysis. (author)

[en] Epoxidized Palm oil liquid acrylate (EPOLA) was introduced with commercial monomer and oligomer to produce coating film by using radiation technique. The percentage of EPOLA in curable formulation has varied in order to study the influence of EPOLA on coating film properties. Meanwhile Zirconium Acrylate was added and varied as additive into curable formulation to investigate the influence on film coating. FTIR analysis was used to monitor the crosslinking process by observed the disappearance of acrylate group. The performance of coating film were investigated by doing several mechanical analysis such as pencil hardness and adhesion test. Meanwhile, in order to determine gloss properties for cured film at different dose of radiation, gloss meter was used to measure gloss value. According to mechanical analysis result, an increasing of EPOLA compound in coating formulation will reduce film hardness and adhesion properties. However after additional of zirconium acrylate into resin formulation the properties of coating film were improved due to presence of zirconium in crosslinking network (author)

[en] Acid oxidized multi-walled carbon nano tubes (MWCNTs) were prepared by refluxing MWCNTs with nitric acid (70 %). To remove the oxidative fragment/ debris, in which partially attached onto the carbon nano tubes lattice, the functionalized MWCNTs (f-MWCNTs) then were refluxed with NaOH (1M) and followed with HCl (1M) wash. The presence of carboxylic group that covalently attached onto the MWCNTs lattice are confirmed with acid-base titration. The TEM image shows the comparison of pure MWCNTs, f-MWCNTs and base-acid wash of f-MWCNTs. (author)

[en] The composite polymer films of poly pyrrole-poly(vinyl alcohol)-iron chloride were prepared in the form of as-cast films. The dielectric properties of the samples were measured at the frequency range of 20 Hz to 1 MHz at different temperatures (300 K up to 353 K) by Inductance Capacitance Resistance (LCR) meter. The results show that the dielectric properties were strongly dependent on the variation of temperature applied. The composite polymer films exhibit the combination of intrinsic dielectric anisotropy, as a result of the competition of free charges, mainly between the polaron in poly pyrrole and the electronic polarisation that corresponded to PVA matrix. The main mechanism behind this finding can be explained by the dipole movement which highly activate at higher temperatures. In addition, high mobility of dipoles movement induced by thermal energy enables them to easily orient towards applied electric field. (author)