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Micromachines 2017, 8(4), 97;

Large-Area Piezoelectric PVDF Fibers Fabricated by Near-Field Electrospinning with Multi-Spinneret Structures

Department of Mechanical and Electro-Mechanical Engineering and Institute of Medical Science and Technology, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
This paper is an extended version of our paper published in the International Conference on Engineering Tribology and Applied Technology 2016 (ICETAT2016), Taipei, Taiwan, 4–6 November 2016.
Author to whom correspondence should be addressed.
Academic Editors: Jeng-Haur Horng and Nam-Trung Nguyen
Received: 16 January 2017 / Revised: 10 March 2017 / Accepted: 17 March 2017 / Published: 24 March 2017
(This article belongs to the Special Issue Microtribology, Adhesion and Surface Engineering)
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In the study, we improved the near-field electrospinning (NFES) by multi-spinnerets with a cylindrical collector to fabricate a large area permanent piezoelectric of polyvinylidene fluoride (PVDF) fibers array. We designed multi-spinnerets by using printed circuit board (PCB) and drilled spinnerets on the solder balls. With different process parameters, we can obtain different diameters of PVDF fibers. By using the Taguchi method analysis, we found that the optimum sample of PVDF fiber arrays were manufactured by an electrical field of 1.6 × 107 V/m. The cylindrical collector with high tangential velocity of 1779.9 mm/s and the heat treatment temperature of 65 °C for one hour. In addition, we used X-ray diffraction (XRD) and scanning electron microscopy (SEM) to analyze β-phase crystal quality and the surface character of PVDF fibers, respectively. From the observation of XRD, it revealed a high diffraction peak at 2θ = 20.6° of piezoelectric crystal β-phase structure. As PVDF solution with concentration of 18 wt % and the conductivity of 44.2 μS/cm was electrospun via NFES with multi-spinneret structure, we obtained a smooth manufacturing process. When the periodical tapping frequency was applied with 9 Hz, the maximum peak voltage of 86.9 mV was generated. In a cicada’s wing test, when the tapping frequency input was applied during 10–50 Hz, the maximum output voltage signals of 6.2 mV were generated. View Full-Text
Keywords: near-field electrospinning (NFES); multi-spinneret; piezoelectric fibers; polyvinylidene fluoride (PVDF) near-field electrospinning (NFES); multi-spinneret; piezoelectric fibers; polyvinylidene fluoride (PVDF)

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Pan, C.-T.; Tsai, K.-C.; Wang, S.-Y.; Yen, C.-K.; Lin, Y.-L. Large-Area Piezoelectric PVDF Fibers Fabricated by Near-Field Electrospinning with Multi-Spinneret Structures. Micromachines 2017, 8, 97.

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