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Title page for etd-0820115-153641


URN etd-0820115-153641 Statistics This thesis had been viewed 681 times. Download 2 times.
Author Jen-Chun Chen
Author's Email Address No Public.
Department Mechanical Engineering
Year 2014 Semester 2
Degree Master Type of Document Master's Thesis
Language zh-TW.Big5 Chinese Page Count 70
Title Evaluation of the possibility to fabricate PVP nanofibers by forcespinning technique
Keyword
  • Nanofiber
  • Polyvinylpyrrolidone
  • Forcespinning technique
  • Forcespinning technique
  • Polyvinylpyrrolidone
  • Nanofiber
  • Abstract This study uses the forcespinning technique to fabricate PVP nanofibers. Aspinneret with high rotation speed produces centrifugal force to drive the polymer solution flowing through a nozzle to form nanofibers. Thefibers can be manufactured efficiently in comparison with the conventional electrospinning technique. The purpose of this study is to evaluate the possibility to produce PVP nanofibers by forcespinning technique and apply the technology for the preparation of Pt-nanowires to be employed in the fuel cell catalyst layer in the future. The PVP solutions with different concentrations are used in the experiments. The parameters considered in this work include the concentration of PVP solution, rotation speed of spinneret, and collecting distance. Spinnerets with different diameters and nozzle designs are also considered. The physical properties of PVP solution including dynamic viscosity and surface tension are also measured and the resultant PVP nanofibers are observed and analyzed by SEM. The results show that a lower concentration of PVP solution results in finerPVP fibers.The fiber diameter decreases with increasing the rotation speed of spinneret. An appropriate collection distance is also an important factor to collect fibers with smaller diameters. The result reveals that the acrylic spinneret of 15 cm diameter with concealed nozzles is a better design of spinneret. The minimum average fiber diameter is about 923 nm which can be obtained at conditions of 10 wt% of PVP solution, 6000 rpm of rotation speed, and 20 cm of collecting distance.
    Advisor Committee
  • Ching-Chih Tai - advisor
  • Min-Hsing Chang - advisor
  • Files indicate in-campus access only
    Date of Defense 2015-06-29 Date of Submission 2015-08-21


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