1. Leather and Shoe Research Association of New Zealand, P.O. Box 8094, Palmerston North 4472, New Zealand
2. Chemical Engineering Building, National Tsing Hua University, No. 101, Section 2, Guangfu Road, East District, Hsinchu City, 300 Taiwan, ROC
3. Electron Microscope Unit, University of New South Wales, Basement, Chemical Sciences Building F10, UNSW Sydney, New South Wales 2052, Australia