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TABLE OF CONTENTS LIST OF FIGURES ......................................................................................................... V LIST OF TABLES ........................................................................................................ VII 1. INTRODUCTION......................................................................................................... 1 1.1. Motivation and Background ........................................................................................ 2 1.2. Fabrication PAN Precursor Nanofibers by Electrospinning........................................ 5 1.3. CNFs by Heat Treatment of PAN Nanofibers ............................................................. 6 1.4. Objectives of this Dissertation Research ..................................................................... 7 2. EXPERIMENTAL METHODS AND MATERIALS................................................ 9 2.1. Literature Overview of Mechanical Testing of Individual Nanofibers ..................... 10 2.2. Electrospinning of PAN Nanofibers .......................................................................... 14 2.3. Heat Treatment of PAN Nanofibers .......................................................................... 14 2.4. Mechanical Experiments with Individual Nanofibers ............................................... 16 2.5. Calibration of Microfabricated Loadcells.................................................................. 19 3. RESULTS AND DISCUSSION ................................................................................. 21 3.1. Effect of Relative Humidity on the Morphology of PAN Nanofibers....................... 22 3.2. Mechanical Properties of PAN Nanofibers vs. Fabrication Conditions .................... 23 3.3. Optimization of Nanofiber Stabilization Conditions ................................................. 25 3.4. Tensile Strength and Modulus of Carbon Nanofibers ............................................... 30 3.5. Conclusions................................................................................................................ 38 4. CONCLUSIONS ......................................................................................................... 39 REFERENCES................................................................................................................ 41 ivPDF Image | HIGH STRENGTH CARBON NANOFIBERS DERIVED FROM ELECTROSPUN POLYACRYLONITRILE
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