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Figure 8
Nanoparticle dipole order controls the shape of the microspheroids. Microspheroids from (a) and (b) 8 mM 1 g l−1 8 h, (c) and (d) 30 mM 0.24 g l−1 24 h, and (e) and (f) 120 mM 1 g l−1 8 h. In (a), (c) and (e) the images were obtained by CXDI for which 1/4 of the microspheroids are cut to reveal the internal structures. In (b), (d) and (f) the schemes represent 2D views of the microspheroids shown in (a), (b) and (c), respectively. White arrows illustrate the c axis orientation of the nanocrystals. The red ellipse refers to regions of high dipole energy, i.e. where nanocrystal growth does not occurs due to noncollinearity of electrical dipoles (frustrated dipole order). The blue lunules represent regions of low dipole energy, i.e. where nanocrystal growth occur due to collinearity of electrical dipoles.

IUCrJ
Volume 9| Part 5| September 2022| Pages 580-593
ISSN: 2052-2525
https://doi.org/10.1107/S2052252522006108