Fig. 4

Library of magic number colloidal clusters and comparison to model. A rich variety of MCCs are observed with increasing number of particles. a–c MCCs without anti-Mackay shells (m₀ type) correspond to truncated Mackay icosahedra. d–f MCCs with one anti-Mackay shell ((m + 1)₁ type) are characterized by a two particle wide rectangular region and a varying number of Mackay shells. g–i Similarly, two anti-Mackay shell clusters ((m + 2)₂ type) feature a width of the rectangular region of three particles. j–l MCCs with a fixed total number of 13 shells but a varying number of anti-Mackay shells (13_a type). In each example, SEM images (left) are compared to the corresponding model (right). Scale bars, 1 µm. m Summary of all MCCs observed in experiment or simulation organized by type. Clusters with the same total number of shells m + a fall on a diagonal. Such structures are close in the total number of particles. As the cluster size increases, more anti-Mackay shells can typically be accommodated around a larger Mackay core