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Author: search.filters.author.Nawanil, ChanisaSubject: search.filters.subject.PZ

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    The effect of thai glutinous rice starch on the synthesis of lead zirconate (PbZrO3) nanofibers via the electrospinning method
    (2013-05-01)
    Nawanil, Chanisa
    ;
    Vittayakorn, Wanwilai
    ;
    Muanghua, Rangson
    ;
    Niemcharoen, Surasak
    ;
    Prachayawarakorn, Jutarat
    This study synthesized blended lead zirconate (PbZrO<inf>3</inf>;PZ)/ poly(ethylene oxide)(PEO)/Glutinous rice starch (GRS) nanofibers by the electrospinning method. A number of parameters such as the ratio between PEO and GRS and calcination temperature have been studied. The as-spun PZ/PEO/GRS composite and PZ fibers were characterized by TG-DTA, X-ray diffraction, FT-IR and SEM, respectively. SEM results showed that smooth and continuous fibers were obtained at the volume ratio of 10:2:1, PZ/PEO/GRS. After calcination of the as-spun PZ/PEO/GRS composite nanofibers at 650 °C for 4 h, PZ nanofibers with perovskite structure were obtained successfully. The fibers had a uniform and smooth surface without grain boundaries. However, when the calcination temperature increased to 750 °C and 850 °C, the fiber represented a necklace-like structure with grain boundaries arranged by grain to grain unit cell clusters. Copyright © 2013 American Scientific Publishers.
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    Preparation and dielectric properties of 3-3 lead zirconate/polyvinylidene fluoride nanocomposite
    (2013-01-01)
    Nawanil, Chanisa
    ;
    Vittayakorn, Wanwilai
    ;
    Prachayawarakorn, Jutarat
    ;
    Vittayakorn, Naratip
    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.