1. College of Materials Science and Engineering, Chongqing University, Chongqing 400044, PR China
2. Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and New Materials, Chongqing University, Chongqing 400044, PR China
3. Spectris Instrumentation and Systems Shanghai Ltd., Shanghai 200233, PR China
4. Department of Fibre and Polymer Technology, KTH Royal Institute of Technology, Teknikringen 56, Stockholm 10044, Sweden