Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/86579
Title: Driving dynamic colloidal assembly using eccentric self-propelled colloids
Authors: Ma, Zhan
Lei, Qun-li
Ni, Ran
Keywords: Trajectories
DRNTU::Engineering::Chemical engineering
Colloidal
Issue Date: 2017
Source: Ma, Z., Lei, Q.-l., & Ni, R. (2017). Driving dynamic colloidal assembly using eccentric self-propelled colloids. Soft Matter, 13(47), 8940-8946. doi:10.1039/C7SM01730H
Series/Report no.: Soft Matter
Abstract: Designing protocols to dynamically direct the self-assembly of colloidal particles has become an important direction in soft matter physics because of promising applications in the fabrication of dynamic responsive functional materials. Here, using computer simulations, we found that in the mixture of passive colloids and eccentric self-propelled active particles, when the eccentricity and self-propulsion of active particles are high enough, the eccentric active particles can push passive colloids to form a large dense dynamic cluster, and the system undergoes a novel dynamic demixing transition. Our simulations show that the dynamic demixing occurs when the eccentric active particles move much faster than the passive particles such that the dynamic trajectories of different active particles can overlap each other while passive particles are depleted from the dynamic trajectories of active particles. Our results suggest that this is in analogy to the entropy-driven demixing in colloid–polymer mixtures, in which polymer random coils can overlap with each other while depleting the colloids. More interestingly, we find that by fixing the passive colloid composition at a certain value with increasing density, the system undergoes an intriguing re-entrant mixing, and the demixing only occurs within a certain intermediate density range. This suggests a new way of designing active matter to drive the self-assembly of passive colloids and fabricate dynamic responsive materials.
URI: https://hdl.handle.net/10356/86579
http://hdl.handle.net/10220/48324
ISSN: 1744-683X
DOI: 10.1039/C7SM01730H
Rights: © 2017 The Author(s). All rights reserved. This paper was published by The Royal Society of Chemistry in Soft Matter and is made available with permission of The Author(s).
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SCBE Journal Articles

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