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arXiv 1306.0709cond-mat.soft
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通过破坏粒子对称性控制主动自组装

Controlling active self-assembly through broken particle symmetries

H. H. Wensink, V. Kantsler, R. E. Goldstein, J. Dunkel

摘要:

已知传统被动材料的许多结构特性是由其微观成分的对称性引起的。相比之下,细胞形状和自我推进之间的相互作用如何控制活性物质的宏观和微观行为,在很大程度上还不清楚。在这里,我们分析了大规模的模拟同质和异质自推进粒子系统,以确定集体运动的粒子对称性破缺的一般影响。我们发现,即使是很小的违反前后对称性导致根本不同的集体行为,这可能有助于分层的不同形状的物种,以及自发形成稳定的微转子。这些结果表明,颗粒形状的变化产生强大的物理机制来控制活性物质的自组装,可能对生物学和材料设计的深远影响。

英文摘要:

Many structural properties of conventional passive materials are known to arise from the symmetries of their microscopic constituents. By contrast, it is largely unclear how the interplay between cell shape and self-propulsion controls the meso- and macroscale behavior of active matter. Here, we analyze large-scale simulations of homo- and heterogeneous self-propelled particle systems to identify generic effects of broken particle symmetry on collective motion. We find that even small violations of fore-aft symmetry lead to fundamentally different collective behaviors, which may facilitate demixing of differently shaped species as well as the spontaneous formation of stable micro-rotors. These results suggest that variation of particle shape yields robust physical mechanisms to control self-assembly of active matter, with possibly profound implications for biology and materials design.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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