Fig. 18.

Schematic illustration for a HKUST-1 crystallisation and b meso/macropore formation in the CO₂-expanded solvent. c SEM images (top) and TEM images (bottom) of HKUST-1 synthesised using scCO₂ at 75 bar, 40 °C for more than 24 h, showing introduction of interconnected macropores.

Reprinted with permission from Doan et al. [120]. Copyright CC BY-NC-SA 4.0