The reactor was cooled down until it reached ambient temperature. Then, it was slowly depressurized and opened. All the liquid droplets were collected from the walls of the upper and lower parts of the reactor, from the liner walls and from the liner cap using a glass pipette, and they were mixed with the slurry remaining in the liner. To separate the liquid from the solid, the slurry was transferred to a vial and centrifuged at 4500 rpm for 12 minutes in a 2-16P centrifuge (Sartorius). The clarified solution was finally filtered in a syringe filter (0.2 μm pore size CHROMAFIL® Xtra PTFE-20/25, Macherey-Nagel). The solid remaining at the bottom of the vial was washed with deionized distilled water and filtered using a paper filter (4-12 μm pore size DP 1506 110, Hahnemühle). Finally, it was dried in ambient air for an entire night.