1. Dept. of Chemical Engineering and Biotechnology; New Museums Site, University of Cambridge; Pembroke St Cambridge CB2 3RA U.K.
2. Dept. of Chemical Engineering; University of Santiago de Compostela, Lope Gómez de Marzoa St, Santiago de Compostela; E-15782 Spain
3. Dept. of Polymer Engineering; University of Minho, Campus de Azurém; 4800-058 Guimarães Portugal