1. Institute of Polymer Science and Engineering, National Taiwan University, Taipei, Taiwan 106, R.O.C.
2. Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan 106, R.O.C.
3. Department of Chemical Engineering and Department of Chemistry, Colorado School of Mines, Golden, Colorado 80401, United States
4. Department of Chemical and Materials Engineering, Department of Physics, National Central University, Jhongli, Taiwan 320, R.O.C.