Hierarchical Colloidal Self-Assembly on Lattice-Mismatched Moiré Patterns

Abstract

Extending atomic epitaxy concepts to colloidal systems for realizing functional surface structures has recently piqued scientific interest. Akin to the growth of ordered metal clusters on graphene moire, spatially ordered colloidal crystals have been realized on soft lithographically fabricated moirépatterns. In addition to moiréperiodicity, lattice misfit strain can bring about a further level of hierarchy in colloidal self-assembly, although its role in selforganization remains unexplored. Here, we demonstrate the self-organized growth of micrometer-sized colloidal pyramid arrays with lateral order extending over millimeter length scales on lattice-mismatched moirépatterns. By probing the film growth dynamics with singleparticle resolution, we uncovered the interplay between lattice misfit strain and topographically varying surface potential within the moiréunit cell, which significantly alters the nucleation process. We also show that the structural organization of colloids within moiréregions primarily depends on the moiréangle, and by tuning it, multiple levels of hierarchy can be achieved.

Lipid packing and cholesterol content regulate membrane wetting by biomolecular condensates

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