Vittayakorn, Wanwilai
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Preferred name
Vittayakorn, Wanwilai
Alternative Name
Vittayakorn, W.
Vittayakorn, Wanwilai C.
Main Affiliation
Email
wanwilai.vi@kmitl.ac.th
95 results
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Item type:Publication, Effect of Sn content on the dielectric and piezoelectric properties of the ternary system (0.975-y)BaTiO3–0.025SrTiO3–yBaSnO3(2017-06-01); ; - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Effect of various nanofillers on the insulating properties of polyethylene composites(2022-01-01) - Some of the metrics are blocked by yourconsent settings
Item type:Publication, The role of γ-C2H5NO2 as a new transient liquid phase in cold sintering process of BaTiO3 composites(2024-07-01) - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Processing and characterizations of Bi2O3/BaTiO3 ceramic(2013-10-29); - 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, Fabrication and properties of BaTiO3-CoFe2O 4 nanocomposites(2013-12-01); ; In this work, BaTiO<inf>3</inf>-xCoFe<inf>2</inf>O<inf>4</inf>, where x = 0, 0.1, 0.2, 0.3, 0.4 and 0.5, nanocomposites were prepared by conventional mixing method and followed by normal sintering in air. The effect of processing condition on phase formation, microstructure, magnetic and electrical properties of the BaTiO<inf>3</inf>-CoFe<inf>2</inf>O<inf>4</inf> nanocomposites was investigated. The phase development and microstructural evolution of this system have been determined via X-ray diffractometer and scanning electron microscope. From the results, it concludes that phase formation, microstructure, electrical and magnetic properties of the BaTiO<inf>3</inf>-xCoFe<inf>2</inf>O<inf>4</inf> nanocomposites strongly depend on chemical composition. © 2013 Copyright Taylor and Francis Group, LLC. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Preparation and dielectric properties of 3-3 lead zirconate/polyvinylidene fluoride nanocomposite(2013-01-01); ; Composites made of electroactive ceramics and a ferroelectric polymer are very attractive for applications since they exhibit good piezoelectric and pyroelectric properties, low densities and their properties can be tailored to various requirements. Here, we reported the preparation and dielectric properties of 3-3 PZ/PVDF nanocomposites by infusion of polyvinylidenedifluoride (PVDF) into the PZ nanofiber mat followed by heating of the composite at 80°C. The 3-3 PZ/PVDF composites were characterized by X-ray diffraction, FT-IR, SEM and LCR meter. The dielectric constant of the PZ/PVDF nanocomposite are relatively stable in the range of 21.98-18.21 within the measurement frequencies from 100 Hz to 2 MHz. This value is higher than the dielectric constant of the polyvinylidene fluoride. Moreover, the dielectric loss of the composite is below 0.09 at low frequencies. © 2013 Copyright Taylor and Francis Group, LLC. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, FABRICATION OF BA5NB4O15 CERAMICS BY FLUX-ASSISTED ULTRA-LOW SINTERING TEMPERATURE TECHNIQUE(2025-01-01); Ba<inf>5</inf>Nb<inf>4</inf>O<inf>15</inf> ceramic is a promising dielectric material for microwave frequencies. One of the factors that affects its dielectric properties is density, which can be controlled by fabrication processes such as sintering. Normally, conventional sintering requires high sintering temperature (T?> 1,200ºC) to produce grain coarsening and pore reduction which consumes high energy. However, there has been growing interest in low-temperature ceramic processing due to its potential to revolutionize the way ceramic materials are manufactured. Cold sintering is a new sintering technique that can be used to fabricate dense ceramics below 300°C. It can be applied to a variety of compounds, and the densification process is driven by the dissolution-precipitation mechanism, with the aid of a congruent solvent, pressure, and temperature. Herein, Ba<inf>5</inf>Nb<inf>4</inf>O<inf>15</inf> ceramics are prepared by cold sintering technique using hydrated barium hydroxide (Ba(OH)<inf>2</inf>-8H<inf>2</inf>O) as a flux to reduce sintering temperature and introduce densification process. The effects of processing parameters, including sintering temperature, dwelling time, pressure, and flux concentration, on the density and dielectric properties of sintered samples were investigated. Phase formation and electrical properties were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), and an LCR meter. Under the sintering conditions T = 150°C, pressure = 7,000 kPa, and t = 60 min, the obtained Ba<inf>5</inf>Nb<inf>4</inf>O<inf>15</inf> ceramic exhibited a relative density of ˜80% which closes to the ceramics obtained from conventional sintering. These results suggest that sintering temperature has little influence on sample density, while applied pressure is the dominant factor in improving density. The mechanism of flux-assisted cold sintering and dielectric properties are also discussed. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Simple Method for Enhancing Performance of the Bacterial Cellulose-Based Triboelectric Nanogenerator by Adding Conductive Interlayer(2023-01-01) - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Preparation and properties of lead free bismuth sodium titanate-bismuth zinc titanate ceramics(2009-12-01); ;