1. Department of Chemical Engineering, National Tsing Hua University, Hsin-Chu, Taiwan 30013, Republic of China, Department of Engineering and System Science, National Tsing Hua University, Hsin-Chu, Taiwan 30013, Republic of China, Department of Anatomy, Chang Gung University, Kwei-San, Taoyuan, 333, Taiwan, Republic of China, and Condensed Matters Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831