[1] ICN2, Bellaterra 08193, Spain
[2] ICREA, Barcelona 08010, Spain
[3] Univ Autonoma Barcelona, Dept Chem Engn, Escola Engn, Bellaterra 08193, Spain
[4] Pontificia Univ Javeriana, Fac Ingn, Inst Geofis, Bogota 110231, Colombia
[5] Appl Nanoparticles SL, Barcelona 08025, Spain
[6] European Synchrotron Radiat Facil, F-38043 Grenoble, France
[7] ICMAB CSIC, Inst Ciencia Mat Barcelona, Bellaterra 08193, Spain