1. Department
of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
2. NIST, Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6102, United States
3. Complex Assemblies
of Soft Matter Laboratory (COMPASS), CNRS-SOLVAY—University of Pennsylvania, UMI 3254, CRTB, Bristol, Pennsylvania 19007, United States
4. Department
of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
5. Institut de Physique et Chimie des Matériaux
de Strasbourg (IPCMS), CNRS—Université de Strasbourg, UMR 7504, 67034 Strasbourg cedex 2, France