1. Department of Chemistry and Chemical Engineering, Eindhoven University of Technology, Eindhoven, The Netherlands
2. Department of Materials, Loughborough University, Leicestershire LE11 3TU, U.K.
3. Research Institute, Teijin Aramid B.V., Velperweg 76, Arnhem, The Netherlands
4. Physics Department & Shanghai Key Laboratory of Magnetic Resonance, East China Normal University, Shanghai, 200062, P. R. China