International Journal of Nanoelectronics and Materials (IJNeaM)
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IJNeaM aims to publish original work of importance in the fields of nanoscience and engineering. Topics covered including Theoretical, Simulation, Synthesis, Design and Fabrication of Nanomaterials and Nanodevices; Metals, Insulators, and Semiconductors with a focus on Electronic, Structural, Magnetic, Optical, Thermal, Transport, Mechanical and other properties for the specialists in Engineering, Chemistry, Physics and Materials Science. IJNeaM accepts submission in the form of Reviews, Research Articles, Short Communications, and selected conference papers.
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PublicationCharacterization of biomass-reinforced biopolyol-based polyurethane foams(Universiti Malaysia Perlis (UniMAP), 2020-05)In this study, polymer composites comprised of polyurethane (PU) foam and two kinds of biomass (coco peat and sphagnum) were prepared. PU industry heavily depends on the petroleum industry. Coco peat and sphagnum are renewable resources. Their use as a reinforcing filler to increase PU foam’s renewable content is yet to be explored. The PU foam was produced via a reaction between 2,4-diphenylmethane diisocyanate and palm kernel oil-based polyol (PKOP). The filler varied from 0–1.2 g. Fourier-transform infrared spectroscopy, morphological analysis, and determination of the mechanical properties of PU foam composites were conducted to identify the effect of the fillers on the PU foam. The results showed that sphagnum has more impact than coco peat on cell structure and the apparent density of the PU foams. The foam cell lost its regular hexagonal ‘bee-hive’ structure, and the apparent density increased to approximately 30% more than the reference sample at 1.2 g filler loading. The PU foam filled with 1.2 g coco peat exhibited significantly improved mechanical properties, with 120% increase in tensile strength compared to the reference sample of the PU foam.
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PublicationThe effect of condensate water on the performance of automotive air conditioning system under difference evaporator air inlet temperature(Universiti Malaysia Perlis (UniMAP), 2020-05)This paper experimentally investigates the effect of condensate water on the performance of automotive air conditioning (AAC) system under difference evaporator air inlet temperature. An experimental test rig was fabricated using the actual component of AAC system used for Proton Wira passenger car. During experimental work, the volume flow rate of condensate water was manipulated at 0, 140 and 340 ml/min. The evaporator air inlet temperature was also varied at 28, 32 and 36°C. The other parameters of compressor speed, condensate water temperature and condenser air inlet temperature were kept constant at 1550 rpm, 29 ± 1°C and 32 ± 1°C, respectively. The study showed that the coefficient of performance (COP) of the AAC system increases when the volume flow rate of condensate water increased from 0 to 140 ml/min. It was due to a dominant decrease in compressor work, as compared to the drop in cooling capacity. In addition, the highest increment in COP occurred at evaporator air inlet temperature of 36°C (9.8%), followed by evaporator air inlet temperature of 28°C (2.8%) and 32°C (0.4%). The highest COP is 3.66, occurred at evaporator air inlet temperature of 32°C and volume flow rate of condensate water of around 140 ml/min
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PublicationEffect of Al2o3 dispersion on enthalpy and thermal stability of ternary nitrate eutectic salt(Universiti Malaysia Perlis (UniMAP), 2020-05)The system efficiency of concentrated solar power (CSP) was determined by using the working temperature of heat transfer fluid (HTF). Initially, organic HTFs were used for this purpose, which had a maximum operating temperature of 400 °C. However, it exhibits poor thermal storage property. The use of inorganic salts which are stable at high temperature (500~600 °C) can significantly increase the system efficiency. These salts can be used as energy storage materials as well. In this paper, nanocomposite comprising of ternary nitrate eutectic molten salt having pre-defined mass dispersed with Al2O3 nanoparticles of 0.1, 0.3, 0.5, and 1 wt.% was tested. The enthalpy and melting point measurements were performed using differential scanning calorimetry (DSC). Thermogravimetric analysis (TGA) was conducted to study the thermal stability of the eutectic salt and mass loss measurement at a temperature higher than 600 ⁰C. The homogeneity and microstructure of synthesized molten salt were examined using scanning electron microscopy (SEM) imaging. The results showed that the melting point of eutectic salt was reduced by 23% with the addition of 1 wt.% of Al2O3 nanoparticles. By increasing the doping of Al2O3, the enthalpy of the mixture increased, indicating that the eutectic mixture could be used for thermal energy storage. SEM imaging analysis revealed the uniform dispersion of Al2O3 nanoparticles in the pure eutectic mixture. Based on the DSC and TGA results, both enthalpy and thermal stability of the molten salt have increased by the addition of Al2O3 nanoparticle, making it a potential candidate salt for CSP applications.
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PublicationSynthesis of polyaniline for water remediation and evaluating its feasibility to be reused as electrical conductor(Universiti Malaysia Perlis (UniMAP), 2020-05)Adsorption is an effective process for humic acid removal; however, disposing the spent adsorbents creates secondary waste to the environment. Hence, this study aims to investigate the feasibility of using polyaniline (PANI, a conductive polymer) to adsorb humic acid. Later on, possibility to recycle the spent PANI as electrical conductor is evaluated. The PANI was found to be 352.96 nm in size and exhibits the N-H functional group. Application study showed that the adsorption efficiency increased from 49.3% to 89.5% when the initial concentration of humic acid increased from 50 mg/L to 200 mg/L. Meanwhile, the increase in the PANI dosage successfully enhances humic acid removal owing to the existence of more adsorbing sites. The spent PANI was then deposited onto a flexible sheet and tested for its electrical conductance. Interestingly, the spent PANI-deposited sheet was found to exhibit lesser conductance (6.94 x 10-5 S) than the fresh PANI-deposited sheet (1.03 x 10-3 S). Also, the magnitude of electrical conductance further reduced with the increase in the amount of humic acid adsorbed onto the PANI. Apparently, the adsorbed humic acid has shielded the electron movement. It is believed that this study will provide new insight on the sustainable usage of water treatment-adsorbents.
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PublicationTechnique to enhance the bandwidth of a very thin artificial magnetic condutor (AMC)(Universiti Malaysia Perlis (UniMAP), 2020-05)This paper introduces a technique to enhance the bandwidth of the Artificial Magnetic Conductor (AMC). A multilayer patch type of Frequency Selective Surface (FSS) is stacked on the AMC structure, to increase the thickness of the overall structure contributing to the lower inductivity consequently the higher the bandwidth. Both AMC and FSS structures were designed by using Rogers RT5880 with the thickness of 0.254 mm and permittivity of 2.2. The bandwidth of the AMC structure is successfully enhanced from 1.97% to 3.79%. The AMC was designed at 12 GHz which can be applied for 5G applications.