1. Department
of Chemistry and Research Institute of Natural Science, Gyeongsang National University, Jinju 660-701, Korea
2. Nanotube
Research Center, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8562 Japan
3. Department
of Chemical Engineering, Hanyang University, Seoul 133-791 Korea