Piezoelectricity of hollow cylindrical near-field electrospinning PBLG fiber arrays for energy harvesting from biological flight

• Main Authors: Hui-wen Li, 李惠雯
• Other Authors: Cheng-Tang Pan
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/9e5e73

碩士 === 國立中山大學 === 機械與機電工程學系研究所 === 101 === In this study, a cylindrical near-field electrospinning (CNFES) process and the Taguchi methods were used to fabricate permanent piezoelectricity of poly(γ-benzyl α, L-glutamate) (PBLG) piezoelectric fibers. Exploring the electrical and mechanical energy conversion characteristics of PBLG piezoelectric fibers. The electrical and mechanical energy conversion characteristics of PBLG piezoelectric fibers applied on biological wings are aim to capture low-frequency energy. First, the PBLG powder was mixed with dichloromethane solution uniformly to prepare PBLG macromolecular solution. High electric field (5×106~1.5×107 V/m) generated sufficient electrostatic force to deform the polymer meniscus into a conical shape (Taylor cone) and subsequently induce a polymer jet from the tip of the Taylor cone. When the droplet overcame the surface tension of the solution, a PBLG piezoelectric fiber was spun from the Taylor cone tip. With using PBLG piezoelectric fiber process and Taguchi method, when the concentration of PBLG increased to 18%, tangential velocity of cylindrical collection was firxed at measured 2618 mm/s, and the electric field was set at 1.5×107 V/m, the voltage was up to 89.14 mV. After Fourier transform infrared spectroscopy (FTIR) measurement the piezoelectric PBLG fibers appear intensely infrared spectrum of absorption of α-helix structure at the 1650 cm-1. When the electric field increased to 1.5×107 V/m, the Dipole-dipole attraction of α crystalline phase enhanced 3.3-fold. The Young''s modulus was measured of 3.64 GPa using micro-tensile testing. The electromechanical coupling coefficient of PBLG fiber was calculated of 2~8%. The voltage output of single piezoelectric fiber was measured under 8 MΩ resistance. The maximum power output is 138.42 pW. Piezoelectric polyvinylidene fluoride (PVDF) fibers have same process and measurement environment, whose impedance is 6 MΩ and maximum power output is 265.81 pW. But non-toxic piezoelectric was developed. Finally, PBLG piezoelectric fibers directly patterned on interdigital electrode for harvesting energy in biological winging process vibration frequency 10~30 Hz (equivalent to 0.01-0.05 N). The voltage was rarely from 7.64 mV to 14.25 mV. The technology of biological modeling could be used as sensors and harvesters in the future.