1. School of Chemical and Environmental Engineering; Shanghai Institute of Technology; Haiquan Road 100 201418 Shanghai P. R. China
2. School of Chemistry and Chemical Engineering; Shanghai Jiao Tong University; Dongchuan Road 800 200240 Shanghai P. R. China
3. Physics Department & Shanghai Key Laboratory of Magnetic Resonance; East China Normal University; North Zhongshan Road 3663 200062 Shanghai P. R. China
4. Technische Universität Dresden; Mommsenstrasse 4 01062 Dresden Germany