Figure 3.

Transmission X-ray scattering of NC solutions during the formation of SPs. (a) Scheme of the experimental setup. A quartz capillary is loaded with a solution of NCs and placed in a LINKAM stage, which is located 1 m from the detector to collect the SAXS signal. The formation of SPs can be initiated by addition of an antisolvent. (b) SAXS pattern of the NC dispersion without addition of the antisolvent, showing only form factor scattering of the individual NCs in solution. (c) SAXS pattern of the diluted NC solution after 3 days of incubation upon addition of 20% (v/v) of methyl acetate antisolvent; the Bragg reflections indicate the formation of crystalline SPs in the solution. The inset shows a zoom on the region with the Bragg peaks, which is scaled by the form factor scattering from (b). The red lines indicate the expected peak positions for a simple-cubic packing of the NCs inside the SPs.