KMITL
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Item type:Publication, RARE EARTH OXIDE DIELECTRICS FOR FLEXIBLE TRIBOELECTRIC NANOGENERATOR(2025-01-01) - Some of the metrics are blocked by yourconsent settings
Item type:Publication, DIELECTRIC AND FATIGUE LIFE ENHANCEMENT IN BaTiO3/Epoxy RESIN BASED COMPOSITES USED AS PIEZOELECTRIC NANOGENERATOR(2025-01-01); ; This study investigates the enhancement of dielectric properties and fatigue life in BaTiO3/epoxy resin composites utilized as the active material in piezoelectric nanogenerators. Through a systematic approach, various fabrication techniques and composite formulations are explored to optimize the dielectric constants, energy density, and piezoelectricity while mitigating fatigue-related degradation. The physical character, phase formation, and chemical properties of these composites are identified via the optical camera, XRD, and FTIR methods, respectively. The frequency dependence of dielectric properties for all samples is measured by an LCR meter. The hysteresis P-E loops are investigated in order to calculate the energy density and energy loss density of materials. The piezoelectric properties of these composites are performed by studying the generated output voltage and current after applying mechanical force to the samples. Moreover, MWCNT nanomaterials have also been incorporated into these composites in order to improve their dielectric value and fatigue life. The results show that the dielectric constant (εr) and dielectric loss (tanδ) of these composites are independent of frequency. After loading BaTiO3 into the epoxy resin matrix, the εr and tanδ significantly increased with the increasing BaTiO3 amount. The energy density and energy loss density of all composites were calculated from these P-E loops, and it is seen that pure epoxy resin shows the lowest energy density and energy loss density values. After loading BaTiO3 into the epoxy resin matrix, both the energy density and the energy loss density of the composites significantly increased. Moreover, after adding 20 percent by volume of BaTiO3 to the system, the energy density increases by 160% compared with pure epoxy resin. For the effect of MWCNT filler, it is seen that the εr, tanδ, energy density and energy loss density are significantly improved after adding 1.5 vol% of MWCNT into the system. The output current generated by applying mechanical force to the sample increased 27 times after adding MWCNT to the BT-filled epoxy resin composite. Finally, it can be concluded that all experimental results demonstrate significant enhancements in dielectric properties, energy density and electric output current, paving the way for the development of robust and efficient piezoelectric nanogenerators for diverse energy harvesting applications. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Investigation on Mechanical Properties and Fracture Mechanism of Carbon Fiber and Glass Fiber Composite at Different Curing Temperature(2020-07-27); ; Larpsuriyakul, P.Weight reduction is one of the big challenges in the auto industry. In the aerospace industry, the high modulus of composite material makes weight savings to replace alloys such as aluminium and titanium. It is one way to reduce fuel consumption and reducing emissions in vehicles by using composite. Among them, carbon fiber and glass fiber are the most useful materials in composite to reduce the weight in vehicles not only in the automotive field but also in aircraft, marine, medicine, sport, etc. In this study, hand lay-up (wet lay-up) method is used to fabricate carbon fiber and glass fiber composites with different curing temperature 30°C (the equivalent of room temperature) until it is dry and 80°C for curing 6 hours. The strength of carbon fiber and glass fiber composites were increased over 10% and the hardness of carbon fiber composite was also increased two times at 80°C curing temperature. Furthermore, the fracture mechanism of carbon fiber and glass fiber composites were also observed by using Scanning Electron Microscopy (SEM) image processing method.2 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, The influence of alkaline treatment of plant fibres on tensile properties of single fibres and composites(2017-01-01); Rattanapaskorn, S.The hypothesis pursued in this work is that by removing hemicellulose and pectin from plant fibres by alkaline treatment, the fibre tensile performance could be improved. Flax fibres were examined as reinforcement. The highest ultimate tensile strength (UTS) resulted for fibre treated with 3% by weight of NaOH solution (up to 12% increase in UTS and 18% increase in Young’s modulus, compared to untreated fibres). A 15% reduction in cross-sectional area of the fibres was observed. Tensile performance of treated (a percentage of fibre volume fraction (V<inf>f</inf> %) of 30%) and untreated (V<inf>f</inf> % of 34%) fibre reinforced polypropylene composites manufactured by the vacuum forming process, were compared. A decrease of UTS and Young’s modulus of the treated material was observed with an increase in consolidation time. The UTS of the treated material was 3.82% lower than that of the untreated material.1 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Synthesis and characterization of polyHIPEs composites with silica and iron oxide nanoparticles(2015-01-01); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Effect of calcination temperature on structural and photocatalyst properties of nanofibers prepared from low-cost natural ilmenite mineral by simple hydrothermal method(2013-09-01)