Fig. 2

Assembly of mesocrystals grown at different V_GS/V_PS ratios by evaporation-driven poor solvent enrichment. a Left: optical image of the vessel after mesocrystal formation is complete (sample #1); the initial liquid level and the height for the onset and completion of mesocrystal growth are indicated as H(0), H(t₁), and H(t₂), respectively. Right: the V_GS(t) (solid lines) and P(t) (dotted lines) curves for V_GS/V_PS = 2.5, N_PE = 1 (black square), V_GS/V_PS = 5, N_PE = 1 (red filled circle), V_GS/V_PS = 12.5, N_PE = 1 (blue triangle), and V_GS/V_PS = ∞, N_PE = 1 (purple diamond). The auxiliary lines and shaded regions show Δt and c_C, estimated from the position of H(t₁) and H(t₂). Scanning electron microscopy (SEM) images for individual mesocrystals, high-resolution SEM (HRSEM) of the mesocrystal facets and corresponding fast-Fourier transform (FFT) patterns of mesocrystals grown from dispersions at V_GS/V_PS ratios of: b 2.5; c 5; d 12.5; e ∞. Scale bar = 10 μm for all SEM images and = 100 nm for all HRSEM images. f Apparent size of mesocrystals (filled symbols) and \(\frac{{c_{\mathrm{C}}}}{{\Delta t}}\) (open diamonds) as a function of V_GS/(V_GS + V_PS). Error bars for the size represent the standard deviation of the mean (number of measurements: 290 for #1, 145 for #2, 118 for #3, and 306 for #4)