期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 109, 期 11, 页码 4052-4057出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1116334109
关键词
-
资金
- Engineering and Physical Sciences Research Council [EP/D071070/1, EP/E030173, EP/I004262/1]
- Royal Society
- National Science Foundation [DMR-0846426]
- Marie Curie Intra-European Fellowship
- Engineering and Physical Sciences Research Council [EP/E030173/1, EP/J007404/1, EP/I004262/1, EP/D071070/1] Funding Source: researchfish
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0846426] Funding Source: National Science Foundation
- EPSRC [EP/E030173/1, EP/J007404/1, EP/I004262/1, EP/D071070/1] Funding Source: UKRI
Adding a nonadsorbing polymer to passive colloids induces an attraction between the particles via the depletion mechanism. High enough polymer concentrations lead to phase separation. We combine experiments, theory, and simulations to demonstrate that using active colloids (such as motile bacteria) dramatically changes the physics of such mixtures. First, significantly stronger interparticle attraction is needed to cause phase separation. Secondly, the finite size aggregates formed at lower interparticle attraction show unidirectional rotation. These micro-rotors demonstrate the self-assembly of functional structures using active particles. The angular speed of the rotating clusters scales approximately as the inverse of their size, which may be understood theoretically by assuming that the torques exerted by the outermost bacteria in a cluster add up randomly. Our simulations suggest that both the suppression of phase separation and the self-assembly of rotors are generic features of aggregating swimmers and should therefore occur in a variety of biological and synthetic active particle systems.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据