1. Center for General Education, Chang Gung University, 259 Wen-Hwa 1st Road, Kwei-Shan Tao-Yuan, Taiwan 333, Republic of China, Department of Material Science, National University of Tainan, 33, Sec. 2, Shu-Lin Street, Tainan, Taiwan 700, Republic of China, and Department of Chemical and Materials Engineering, Chang Gung University, 259 Wen-Hwa 1st Road, Kwei-Shan Tao-Yuan, Taiwan 333, Republic of China