1. ENSL, CNRS, Laboratoire de Physique, F-69342 Lyon, France
2. PoreLab, The Njord Centre, Department of Physics, University of Oslo, P. O. Box 1048 Blindern, N-0316 Oslo, Norway
3. PoreLab, Dep. of Geoscience and Petroleum, Norwegian University of Science and Technology, Trondheim, Norway
4. PoreLab, Dep. of Chemistry, Norwegian University of Science and Technology, Trondheim, Norway
5. Department of Chemical Engineering, Swansea University, Bay Campus, Swansea, UK