1. Center of Advanced Science and Engineering for Carbon (Case 4carbon); Department of Macromolecular Science and Engineering; Case Western Reserve University; 10900 Euclid Avenue Cleveland OH 44106 USA
2. State Key Laboratory of Solidification Processing; Northwestern Polytechnical University; Xi'an 710072 China
3. National Institute of Aerospace; 100 Exploration Way Hampton VA 23666 USA
4. Mail Stop 226; Advanced Materials and Processing Branch; NASA Langley Research Center; Hampton VA 23681 USA