1. Department of Chemical Engineering, National Chung Hsing University, Taichung 402, Taiwan
2. Department of Biomedical Engineering, Center for Nanotechnology, Chung Yuan Christian University, Chung-Li,
Taoyuan 320, Taiwan
3. Chung Yuan Christian University, Chung-Li, Taoyuan 320, Taiwan
4. Department of Chemical Engineering, National Tsing Hua University, Hsinchu 300, Taiwan