1. Phantom‐g CICECO – Aveiro Institute of Materials Department of Physics University of Aveiro Aveiro 3810‐193 Portugal
2. Institute of Chemistry São Paulo State University (UNESP) Araraquara São Paulo 14800‐060 Brazil
3. Nanomaterials for Bioimaging Group Universidade Autónoma de Madrid Madrid 28049 Spain
4. Department of Chemical Engineering Massachusetts Institute of Technology Cambridge MA 02139 USA