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. 2019 May 23;10:2282. doi: 10.1038/s41467-019-10173-5

Fig. 4.

Fig. 4

Activation and surface area of the HKUST-1 MOFs. a The HKUST-1 MOFs that were synthesized under the Rayleigh SAW excitation can be seen to vary in color from a solvent-rich light blue shade to a solvent-poor dark blue shade depending on the input voltage that is coupled into the drop, indicating that the crystals are progressively activated simultaneously during the synthesis as the intensity of the acoustic energy into the drop is increased. b N2 sorption isotherms for the HKUST-1 MOFs synthesized at 1.5 Vrms (green dashed line), 4.5 Vrms (red dashed line), 7.5 Vrms (blue dashed line) and 9 Vrms (purple dashed line) compared to that for bulk HKUST-1 (black solid line)