Title page for etd-0717117-002205


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URN etd-0717117-002205
Author Ming-chun Hsieh
Author's Email Address No Public.
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Department Mechanical and Electro-Mechanical Engineering
Year 2016
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title A Study of Spider Silk for Energy Harvester
Date of Defense 2017-07-19
Page Count 84
Keyword
  • Spider silk
  • Nature protein fiber
  • Piezoelectricity
  • Energy havester
  • Abstract In this study, the piezoelectric properties of spider silk (dragline) produced by Taiwan local spider (Nephila pilipes) was confirmed. Firstly, electron microscopy was used to observe the surface morphology and diameter of spider silk, in order to describing its smooth characteristic. Then the mechanical properties of spider silk were investigated by micro-tensile test and nano-indentation test. The results showed that the elastic modulus of spider silk was between 5 and 7 GPa, the strength ranged from 510 to 850 MPa, and the extensibility was between 20-25%. It can be concluded that spider silk has good mechanical strength and ductility. The positive piezoelectric effect test was performed by using a 4 Hz beater to apply a fixed deformation on the spider silk, and the output of the voltage signal confirmed the positive piezoelectric effect of the spider silk. The converse piezoelectric test confirmed that when an alternating electric field was given, it can cause the silk to be deformed which proved that the spider silk has piezoelectric properties. By polarizing the spider’s silk, the output values of peak voltage and peak current showed significantly improved. The peak voltage value rose up from 13.4 mV to 46.7 mV, and the peak current value rose up from 70.6 nA to 105 nA. These results were caused from the high voltage electric field made the internal structure of the material more directional. Impedance matching test was to obtain the maximum output power when the load resistance equals to the internal resistance. The energy harvester made from non-polarized spider silk can produce a maximum output power of 24.93 pW when it was in parallel with 4.7 MΩ resistor, yet the energy harvester made from polarized spider silk can produce a maximum output power of 59.5 pW when it was in parallel with 8.2 MΩ resistor. Fourier Transform Infrared Spectroscopy (FTIR) test indicated that the additional electric field does make spider’s silk more directional in structure. By analyzing polarized and non-polarized spider silk, it can be found that the secondary structure of α-helix and β-sheet in spider silk were increased after polarized.
    Advisory Committee
  • Ting-Nung Shiau - chair
  • Jung-Hung Sun - co-chair
  • Cheng-Tang Pan - advisor
  • Chi-Hui Chien - advisor
  • Files
  • etd-0717117-002205.pdf
  • Indicate in-campus at 99 year and off-campus access at 99 year.
    Date of Submission 2017-08-28

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