Shaping phases by phasing shapes.

Incorporation of shape-shifting building blocks into self-assembled systems has emerged as a promising concept for dynamic structural control. The computational work by Nguyen et al. reported in this issue of ACS Nano examines the phase reconfigurations and kinetic pathways for systems built from shape-shifting building blocks. The studies illustrate several unique properties of such systems, including more efficient packings, novel structures that are distinctive from those obtained through conventional self-assembly, and reversible multistep shape-shifting pathways. The proposed assembly strategy is potentially applicable to a diverse range of systems because it relies on a change of geometrical constraints, which are common across all length scales. Recent developments in the areas of responsive materials and self-assembly methods provide feasible platforms for experimental realizations of shape-shifting reconfigurations; such systems might enable the next generation of dynamically switchable materials and reconfigurable devices.