Fig. 2.

The chirality depends on both the geometry and orientation of dimers. (A) Chiral clusters (trimer, tetramer, and pentamer) with an increasing number of petals. The central dimer orients its small lobe toward the substrate. (B) Chiral/achiral clusters with five and six petals. The central dimer orients its large lobe toward the substrate. (C) Colloidal tetramers formed from dimers with different aspect ratios, $\alpha =R_2/R_1$. (Scale bars for A–C: 5 µm.)