1. Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts
02139, United States
2. Department
of Chemical Engineering and Materials Science, Wayne State University, Detroit, Michigan 48202, United States
3. Research Centre for Non-Conventional
Energy, Istituto Eni Donegani Environmental Technologies, Via Fauser 4, I-28100 Novara, Italy
4. Institute of Materials, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne
CH-1015, Switzerland