Colloidal particles at an interface exhibit a wide range of self-assembly and compaction dynamics, depending on their shape. In a recent article (A. N. Kato et al., Journal of Colloid And Interface Science 641, 492–498 (2023)), we clarified how the surface roughness of particles affects interparticle interactions at interfaces. Sufficiently rough particles exhibit an intermediate state between a gas-like state and a solid-like state, which is featured by percolating network formation due to roughness-induced capillary attraction. Moreover, roughness lowers the jamming point and finally drives the gradual collapse due to the asperities of particles. In this article, we first review the interfacial properties of anisotropic colloids at interfaces and then focus on the results of our paper on rough colloids.
