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

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    Influence of dispersed phase morphology on electrical and fatigue properties of BaTiO3/PDMS nanogenerator
    (2018-11-01)
    Sriphan, Saichon
    ;
    Nawanil, Chanisa
    ;
    Vittayakorn, Naratip
    A flexible piezoelectric nanogenerator (FPENG) was fabricated by incorporating barium titanate (BT) fibers and BT powders into polydimethylsiloxane (PDMS) matrix phase, also with an interdigital electrodes (IDEs). The electrospinning method was used to prepare BT fibers. Phase structure was carried out by the x-ray diffraction (XRD) technique. By using the Rietveld refinement method, a tetragonal structure of BT fiber could be confirmed. The scanning electron microscopy results showed a non-smooth surface of BT fibers, indicating the polymeric and organic precursors have been removed. The fabricated FPENG with 50% ratio of BT fibers was capable to generate an open-circuit voltage of ≈ 12 V and a short-circuit current of ≈ 1 μA. The effect of dispersed phases inside FPENG becomes the role to improve the output performance. This FPENG device can operate up to 5k times before degeneration. By continuously pressing up to 40k times, the output voltage tended to decrease reaching to a null value. The mechanical fatigue effect has been found that it related to the damage produced at the interface between IDEs and PDMS during pressing. The present results can be guided to further design the material and the device structure to obtain high-performance and stability of the FPENG devices.
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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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    Synthesis and phase evolution of electrospun antiferroelectric lead zirconate (PbZrO3) nanofibers
    (2012-08-01)
    Nawanil, Chanisa
    ;
    Boomchom, Banjong
    ;
    Prachayawarakorn, Jutarat
    ;
    Vittayakorn, Wanwilai C.
    ;
    Vittayakorn, Naratip
    Lead zirconate (PbZrO<inf>3</inf>; PZO) fibers were synthesized by the electrospinning method using a solution that contained 5 wt% poly(ethylene oxide) (PEO) in ethanol and a sol-gel solution of PZO. Some parameters varied, for example, the ratio between PEO and PZO, concentrations of the precursor solution, flow rate, and calcination temperature. The as-spun and calcined PZO/PEO composite fibers were characterized by TG-DTA, X-ray diffraction, FT-IR, SEM and TEM. PZO fibers were obtained successfully with a well-developed perovskite structure after as-spun PZO/PEO composite fibers were calcined using the PZO/PEO volume ratio of 10:3 at a PZO concentration of 1.0 M at 650 °C for 4 h. Stable nanofibers were produced with an average diameter of 300 ± 64 nm. Additionally, the PZO fibers showed a Curie temperature that rose by nearly 13 °C, when comparing with a normal PZO particle. © 2012 Elsevier B.V. All rights reserved.