Fig. 4

Assembly of mesocrystals by evaporation-driven poor-solvent enrichment at different amounts of added oleic acid. a Apparent size of mesocrystals grown from dispersions at different V_OA/m_NC. Error bars represent the standard deviation of the mean (number of measurements: 179 for #13, 215 for #14, 177 for #e, 113 for #16, 145 for #2 and 78 for #17). b Electrophoretic mobility of oleate-capped iron oxide nanocubes in chloroform at different V_OA/m_NC (color lines with symbols, in unit of μL mg⁻¹). The vertical lines indicate the electrical charge (in unit of e). c–h 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_OA/m_NC of: c 0 μL mg⁻¹ (sample #13); d 0.2 μL mg⁻¹ (sample #14); e 0.4 μL mg⁻¹ (sample #15); f 0.8 μL mg⁻¹ (sample #16); g 1.6 μL mg⁻¹ (sample #2); h 3.2 μL mg⁻¹ (sample #17). Scale bar = 10 μm for all SEM images and =100 nm for all HRSEM images