1. Department of Chemical Sciences and INSTM, Trieste Unit
2. ICCOM-CNR Trieste Research Unit and Center of Excellence for Nanostructured Materials (CENMAT)
3. Synchrotron SOLEIL L’Orme des Merisiers, St Aubin BP48, 91192 Gif sur Yvette Cedex, France
4. Department of Chemical Engineering and Materials Science, University of California, Davis, One Shields Avenue, Davis, California 95616
5. Department of Molecular and Cellular Biology, University of California, Davis, One Shields Avenue, Davis, California 95616 and Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, California 94550
6. Materials Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, 37830
7. Department of Physical Chemistry-Laboratory of Electron Microscopy, University of Venice, via Torino 155, 30172 Mestre, Venice, Italy