1. PhD Student, Dept. of Chemical Engrg. and Chemical Technol., Imperial Coll. of Sci., Technol. and Medicine, Prince Consort Rd., SW7 2BY, UK.
2. Undergraduate Student, Dept. of Chemical Engrg. and Chemical Technol., Imperial Coll. of Sci., Technol. and Medicine, Prince Consort Rd., SW7 2BY, UK.
3. Res. Assoc., Dept. of Chem. Engrg. and Chem. Technol., Imperial Coll. of Sci., Technol. and Medicine, Prince Consort Rd., SW7 2BY, UK.
4. Sr. Lect., Dept. of Chem. Engrg. and Chem. Technol., Imperial Coll. of Sci., Technol. and Medicine, Prince Consort Rd., SW7 2BY, UK. E-mail: d.stuckey@ic.ac.uk