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Title: Tunable structure and dynamics of active liquid crystals

Journal Article · · Science Advances

Active materials are capable of converting free energy into directional motion, giving rise to notable dynamical phenomena. Developing a general understanding of their structure in relation to the underlying nonequilibrium physics would provide a route toward control of their dynamic behavior and pave the way for potential applications. The active system considered here consists of a quasi–two-dimensional sheet of short (≈1 μm) actin filaments driven by myosin II motors. By adopting a concerted theoretical and experimental strategy, new insights are gained into the nonequilibrium properties of active nematics over a wide range of internal activity levels. In particular, it is shown that topological defect interactions can be led to transition from attractive to repulsive as a function of initial defect separation and relative orientation. Furthermore, by examining the +1/2 defect morphology as a function of activity, we found that the apparent elastic properties of the system (the ratio of bend-to-splay elastic moduli) are altered considerably by increased activity, leading to an effectively lower bend elasticity. At high levels of activity, the topological defects that decorate the material exhibit a liquid-like structure and adopt preferred orientations depending on their topological charge. Together, these results suggest that it should be possible to tune internal stresses in active nematic systems with the goal of designing out-of-equilibrium structures with engineered dynamic responses.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE; University of Chicago - Materials Research Science & Engineering Center (MRSEC); National Science Foundation (NSF); University of Chicago - Institute for Biophysical Dynamics
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1498507
Journal Information:
Science Advances, Vol. 4, Issue 10; ISSN 2375-2548
Publisher:
AAASCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 89 works
Citation information provided by
Web of Science

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Cited By (15)

Sculpting stable structures in pure liquids journal February 2019
Tunable corrugated patterns in an active nematic sheet journal October 2019
Statistical properties of autonomous flows in 2D active nematics journal January 2019
Topological states in chiral active matter: Dynamic blue phases and active half-skyrmions journal February 2019
Self-organizing motors divide active liquid droplets journal May 2019
Microfluidic control over topological states in channel-confined nematic flows journal January 2020
Active nematics with anisotropic friction: the decisive role of the flow aligning parameter journal January 2020
Data-driven quantitative modeling of bacterial active nematics journal December 2018
Topological structure and dynamics of three-dimensional active nematics journal March 2020
Entropy production rate is maximized in non-contractile actomyosin journal November 2018
The interplay between activity and filament flexibility determines the emergent properties of active nematics journal January 2019
The interplay between activity and filament flexibility determines the emergent properties of active nematics preprint January 2017
Topological states in chiral active matter: dynamic blue phases and active half-skyrmions text January 2018
Microfluidic control over topological states in channel-confined nematic flows text January 2020
Data-driven quantitative modeling of bacterial active nematics text January 2020

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