1. Zernike Institute for Advanced Materials; University of Groningen; Nijenborgh 4 9747 AG Groningen The Netherlands
2. Department of Materials Science and Engineering; Stanford University; 476 Lomita Mall, McCullough Building Stanford CA 94305 USA
3. Polyera Corporation; Skokie IL 60077 USA
4. Petrochemicals Research Institute; King Abdulaziz City for Science and Technology; P.O. Box 6086 Riyadh 11442 Saudi Arabia