1. Department of Chemical Engineering, National Taiwan University, Taipei 106 Taiwan
2. Department of Chemical Engineering, Columbia University, New York, New York 10027, United States
3. Institute of Polymer Science and Engineering, National Taiwan University, Taipei 10617, Taiwan
4. Department of Chemical and Materials Engineering, National Central University, Jhongli, 320 Taiwan
5. Department of Physics, National Central University, Jhongli, 320 Taiwan