1. Department of Chemical Engineering, University of Waterloo, 200 University Avenue West, Waterloo N2L 3G1, Canada
2. Waterloo Institute for Nanotechnology, University of Waterloo, 200 University Avenue West, Waterloo N2L 3G1, Canada
3. Microcellular Plastics Manufacturing Laboratory, Department of Mechanical and Industrial Engineering, University of Toronto, 5 King’s College Road, Toronto M5S 3G8, Canada