
168 Electrochemically Enabled Sustainability
mesopores in the shell. The TEM images in Figure 4.2c through f reveal the
HMC spherical capsules with different hollow core sizes and shell thicknesses.
Evidently, the core size and shell thickness of the HMC can be managed inde-
pendently by controlling the core size and shell thickness of the SCMS tem-
plate. This can be realised by two separate synthesis processes, consisting of
the solid core formation by the Stöber method, and the subsequent formation
of the mesoporous shell by the Kaiser approach. The solid core size is mainly
controlled by the amount of added TEOS and the reaction time at the ...