Sukwisute, Pisan

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Sukwisute, Pisan
Alternative Name
Sukwisute, P.
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pisan.su@kmitl.ac.th

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    Item type:Publication,
    Energy conversion capacity of barium zirconate titanate
    (2020-01-01)
    Binhayeeniyi, Nawal
    ;
    Sukwisute, Pisan
    ;
    Nawae, Safitree
    ;
    Muensit, Nantakan
    In this study, we investigated the effect of zirconium content on lead-free barium zirconate titanate (BZT) (Ba(Zr<inf>x</inf>Ti<inf>1-x</inf>)O<inf>3</inf>, with x = 0.00, 0.01, 0.03, 0.05, and 0.08), which was prepared by the sol-gel method. A single-phase perovskite BZT was obtained under calcination and sintering conditions at 1100 °C and 1300 °C. Ferroelectric measurements revealed that the Curie temperature of BaTiO<inf>3</inf> was 399 K, and the transition temperature decreased with increasing zirconium content. At the Curie temperature, Ba(Zr<inf>0.03</inf>Ti<inf>0.97</inf>)O<inf>3</inf> with a dielectric constant of 19,600 showed the best performance in converting supplied mechanical vibration into electrical power. The experiments focused on piezoelectric activity at a low vibrating frequency, and the output power that dissipated from the BZT system at 15 Hz was 2.47 nW (30 MΩ). The prepared lead-free sol-gel BZT is promising for energy-harvesting applications considering that the normal frequencies of ambient vibration sources are less than 100 Hz.
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    Morphology and dielectric investigations of hydrated-halt P(VDF-HFP) membranes
    (2017-01-01)
    Yuennan, J.
    ;
    Sukwisute, P.
    ;
    Muensit, N.
    This study focuses on a preparation and characterization of hydrated-salt membranes based on the blend of poly(vinylidene fluoride-hexafluoropropylene) [P(VDF-HFP)] and magnesium chloride (MgCl<inf>2</inf>·6H<inf>2</inf>O). The membranes with MgCl<inf>2</inf>·6H<inf>2</inf>O concentration of 0-4 wt% were prepared by solution casting technique. An elemental composition of the prepared samples was analyzed using energy dispersive x-ray spectroscopy (EDS). The surface morphology and pore size of these membranes were investigated by scanning electron microscopy (SEM). Surface roughness of the as-received membranes was evaluated by atomic force microscopy (AFM). The degree of the crystallinity and phase structures of the P(VDF-HFP) membranes were analyzed by X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). The dielectric and the electrical conductivity of all samples were measured in a range of 1-10<sup>5</sup> Hz. The SEM and AFM images revealed that the formation of the microporous P(VDF-HFP) membranes was controllable by the adjustment of MgCl<inf>2</inf>·6H<inf>2</inf>O content. The surface roughness, pore size and ionic conductivity of the as-received membranes increased with MgCl<inf>2</inf>·6H<inf>2</inf>O concentration. The dielectric constant reached its maximum value of about 25 at 3.5 wt% of MgCl<inf>2</inf>·6H<inf>2</inf>O. The XRD results showed that the mixture of MgCl<inf>2</inf>·6H<inf>2</inf>O salt led to a decrease in the degree of crystallinity. However, the salt-loaded P(VDF-HFP) enhanced the fraction of an electroactive β-phase up to 84% and this was confirmed by the FTIR results. This pointed out that the hydrated-salt P(VDF-HFP) membranes had a potential in new applications such as energy harvesting area.