1. Surfactant & Colloid Group, Department of Chemistry, University of Hull, Hull HU6 7RX, U.K.
2. Schlumberger Gould
Research, High Cross, Madingley Road, Cambridge CB3 0EL, U.K.
3. BP
Institute for Multiphase Flow, Cambridge University, Madingley
Road, Cambridge CB3 0EZ, U.K.