1. School of Transportation Science and Engineering, Harbin Institute of Technology, Harbin 150090, P. R. China
2. Institute of Highway Engineering, RWTH Aachen University, Aachen 52074, Germany
3. Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Colloid and Interface and Thermodynamics, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China