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Title: Interplay of Structure, Elasticity, and Dynamics in Actin-Based Nematic Materials

Journal Article · · Proceedings of the National Academy of Sciences of the United States of America
 [1];  [2];  [3];  [4];  [5]
  1. Univ. of Chicago, IL (United States). Inst. for Molecular Engineering
  2. Univ. of Chicago, IL (United States). James Franck Inst.; Univ. of Chicago, IL (United States). Dept. of Physics
  3. Univ. of Massachusetts, Amherst, MA (United States). Dept. of Physics
  4. Univ. of Chicago, IL (United States). James Franck Inst.; Univ. of Chicago, IL (United States). Dept. of Physics; Univ. of Chicago, IL (United States). Inst. for Biophysical Dynamics
  5. Univ. of Chicago, IL (United States). Inst. for Molecular Engineering; Argonne National Lab. (ANL), Argonne, IL (United States). Inst. for Molecular Engineering

Achieving control and tunability of lyotropic materials has been a long-standing goal of liquid crystal research. Here we show that the elasticity of a liquid crystal system consisting of a dense suspension of semiflexible biopolymers can be manipulated over a relatively wide range of elastic moduli. Specifically, thin films of actin filaments are assembled at an oil-water interface. At sufficiently high concentrations, one observes the formation of a nematic phase riddled with +/- 1/2 topological defects, characteristic of a two-dimensional nematic system. As the average filament length increases, the defect morphology transitions from a U shape into a V shape, indicating the relative increase of the material's bend over splay modulus. Furthermore, through the sparse addition of rigid microtubule filaments, one can gain additional control over the liquid crystal's elasticity. We show how the material's bend constant can be raised linearly as a function of microtubule filament density, and present a simple means to extract absolute values of the elastic moduli from purely optical observations. Finally, we demonstrate that it is possible to predict not only the static structure of the material, including its topological defects, but also the evolution of the system into dynamically arrested states. Despite the nonequilibrium nature of the system, our continuum model, which couples structure and hydrodynamics, is able to capture the annihilation and movement of defects over long time scales. Thus, we have experimentally realized a lyotropic liquid crystal system that can be truly engineered, with tunable mechanical properties, and a theoretical framework to capture its structure, mechanics, and dynamics.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE; National Science Foundation (NSF); Army Research Office (ARO)
Grant/Contract Number:
AC02-06CH11357; DMR-1710318; MCB-1344203
OSTI ID:
1459902
Journal Information:
Proceedings of the National Academy of Sciences of the United States of America, Vol. 115, Issue 2; ISSN 0027-8424
Publisher:
National Academy of Sciences, Washington, DC (United States)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 66 works
Citation information provided by
Web of Science

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Cited By (19)

Active nematics journal August 2018
Encapsulation of the cytoskeleton: towards mimicking the mechanics of a cell journal January 2019
Chiral stresses in nematic cell monolayers journal January 2020
Repetitive stretching of giant liposomes utilizing the nematic alignment of confined actin journal May 2018
Advances in Biological Liquid Crystals journal March 2019
Self-organizing motors divide active liquid droplets journal May 2019
Tunable structure and dynamics of active liquid crystals journal October 2018
Self-organization of spindle-like microtubule structures journal January 2019
Twist-induced crossover from two-dimensional to three-dimensional turbulence in active nematics journal July 2018
High aspect ratio nanotubes assembled from macrocyclic iminium salts journal August 2018
Data-driven quantitative modeling of bacterial active nematics journal December 2018
Entropy production rate is maximized in non-contractile actomyosin journal November 2018
Theory of defect motion in 2D passive and active nematic liquid crystals journal January 2019
Organization of associating or crosslinked actin filaments in confinement journal October 2019
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
Tunable structure and dynamics of active liquid crystals text January 2018
Chiral stresses in nematic cell monolayers text January 2019
Data-driven quantitative modeling of bacterial active nematics text January 2020

Figures / Tables (7)


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