Figure 2.
SEM images of a supraparticle
formed from a bidisperse colloidal
suspension during “fast” evaporation (24% humidity).
The diameters of the small and large colloids are 
, respectively. The initial colloid volume
fractions are 
and 
, respectively. (a) Top view of
the supraparticle
surface. (b) Overlay image of cross-section from the surface to the
inner part of the supraparticle, showing the stratification of small
and large colloids. A more-extended cross-section showing more of
the inner part is shown in Figure S3. (c)
Estimated relative volume fractions of small (
) and
large (
) colloids
obtained from SEM images (see
the Experimental Methods section for details).