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Author: search.filters.author.Vittayakorn, NaratipSubject: search.filters.subject.Polydimethylsiloxane

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    RARE EARTH OXIDE DIELECTRICS FOR FLEXIBLE TRIBOELECTRIC NANOGENERATOR
    (2025-01-01)
    Kingkam, Wilasinee
    ;
    Issarapanacheewin, Sudarat
    ;
    Ukasi, Sirinya
    ;
    Pulphol, Phieraya
    ;
    Pakawanit, Phakkhananan
    Rare earth oxides (REO) are well known in catalysts, glass-related industries, and permanent magnets manufacturing for almost 70%, according to the mature industry. This work proposes the new developments of REO as the emergence for mechanical energy harvesting (MEH) technology. The binary-system of REO or R<inf>2</inf>O<inf>3</inf>, including La<inf>2</inf>O<inf>3</inf>, Sm<inf>2</inf>O<inf>3</inf> and Nd<inf>2</inf>O<inf>3</inf>, are used as dielectric materials to incorporate polydimethylsiloxane (PDMS) for fabricating flexible triboelectric nanogenerators (TENG), one of MEH devices. The change in REO’s amount was studied at 0.5, 2.5, 5, and 10 wt%. Upon applying mechanical force in vertical direction, the PDMS/R<inf>2</inf>O<inf>3</inf> TENG can convert mechanical energy into electricity for the best value of ~66 V and ~93 μA with power density of about ~62 μW·cm<sup>-2</sup>. The PDMS/La<inf>2</inf>O<inf>3</inf> can be used to fully charge the 0.22 and 0.33 μF capacitor within 3 seconds and power up over 100 LEDs directly. Moreover, the influence of triboelectric polarity and dielectricity on the triboelectric output performance is scientifically discussed by following the percolation point with air breakdown limitation’s theory. The researcher believes that the knowledge of this work will be inexhaustible useful to develop a group of REO in broad applications of MEH electronics in future.
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    Effect of surface treatment on electrical properties of polydimethylsiloxane based triboelectric nanogenerator
    (2020-01-01)
    Panprom, Parinya
    ;
    Vittayakorn, Naratip
    ;
    Nawanil, Chanisa
    This research investigated the effect of surface treatment on electrical properties of flexible triboelectric nanogenerator (TENG). Polydimethylsiloxane (PDMS) was used as triboelectric layer. The PDMS pads were prepared by simple casting method and the effect of surface treatments by heat and acid was examined. Physical morphology of treated samples were investigated by scanning electron microscope (SEM). Electrical properties were measured under continuous periodic knocking. The results revealed that the heat-treated PDMS-based TENG showed the outstanding output voltage. The maximum output voltage of heat-treated based TENG reached approximately 9 V, which was over 4 times larger than those of normal PDMS based TENG. The research demonstrated the feasibility to utilize PDMS-based TENG as an energy harvesting device and presented a cost-effective method for producing high-efficiency PDMS based TENG.
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    Electrical and dielectric properties of barium titanate–polydimethylsiloxane nanocomposite with 0-3 connectivity modified with carbon nanotube (CNT)
    (2019-01-02)
    Nawanil, Chanisa
    ;
    Makcharoen, Worawut
    ;
    Khaosa-Ard, Krittanat
    ;
    Maluangnont, Tosapol
    ;
    Vittayakorn, Wanwilai
    This study explored the preparation and electrical properties of 0–3 barium titanate/polydimethylsiloxane nanocomposites by dispersing barium titanate nanoparticles (BaTiO<inf>3</inf>; BT) into the polydimethylsiloxane (PDMS) matrix phase. The effect of barium titanate nanoparticles on electrical properties has been investigated systematically, and the relative permittivity of nanocomposites was found to increase significantly with increasing barium titanate content. Different theoretical models were used to predict the dielectric constant of these composites and compare their experimental value with the theoretical value in order to find an appropriate equation. The result indicated that the dielectric properties of composites are influenced not only by relative permittivity of the components but also dependence on interactions between ceramics and polymers. Furthermore, the preparation and dielectric properties of BT/PDMS nanocomposites modified with carbon nanotube (CNT) were also studied. The dielectric results demonstrate that adding CNT can enhance the relative permittivity of the BT/PDMS composite via improvement of dispersion and distribution of the BT nanoparticles in the PDMS matrix phase. Moreover, the electrical outputs from the BT/PDMS/CNT nanocomposites generator were measured under periodic knocking. The nanocomposites innovatively expand the feasibility of self-powered energy systems for smart sensor and energy harvesting applications.