摘要 : Hypothesis. Because they are self-propulsive, active colloidal particles can interact with their environment in ways that differ from passive, Brownian particles. Here, we explore how interactions in different microstructural regi... 展开 Hypothesis. Because they are self-propulsive, active colloidal particles can interact with their environment in ways that differ from passive, Brownian particles. Here, we explore how interactions in different microstructural regions may contribute to colloidal crystal annealing. Experiments. We investigate active particles propagating in a quasi-2D colloidal crystal monolayer pro-duced by alternating current electric fields (active-to-passive particle ratio ti 1:720). The active particle is a platinum Janus sphere propelled by asymmetric decomposition of hydrogen peroxide. Crystals are char-acterized for changes in void properties. The mean-squared-displacement of Janus particles are measured to determine how active microdynamics depend on the local microstructure, which is comprised of void regions, void-adjacent regions (defined as within three particle diameters of a void), and interstitial regions. Findings. At active particle energy EA = 2.55 kBT, the average void size increases as much as three times and the average void anisotropy increases about 40% relative to the passive case. The average micrody-namical enhancement, <8(t)>, of Janus particles in the crystal relative to an equivalent passive Janus par-ticle is reduced compared to that of a free, active particle (<8(t) > is 1.88 +/- 0.04 and 2.66 +/- 0.08, respectively). The concentration of active particles is enriched in void and void-adjacent regions. Active particles exhibit the greatest change in dynamics relative to the passive control in void -adjacent regions (<8(t)> = 2.58 +/- 0.06). The results support the conjecture that active particle micrody-namical enhancement in crystal lattices is affected by local defect structure. (c) 2023 Elsevier Inc. All rights reserved. 收起