Statistical properties of autonomous flows in 2D active nematics

Lemma, Linnea M.; DeCamp, Stephen J.; You, Zhihong; Giomi, Luca; Dogic, Zvonimir

doi:10.1039/c8sm01877d

Statistical properties of autonomous flows in 2D active nematics

Journal Article · Wed Mar 13 00:00:00 EDT 2019 · Soft Matter

DOI:https://doi.org/10.1039/c8sm01877d· OSTI ID:1659763

^[1]; ^[2]; You, Zhihong ^[3]; ^[3]; Dogic, Zvonimir ^[4]

Brandeis University, Waltham, MA (United States); University of California, Santa Barbara, CA (United States); University of California Santa Barbara
Brandeis University, Waltham, MA (United States)
Universiteit Leiden (The Netherlands)
Brandeis University, Waltham, MA (United States); University of California, Santa Barbara, CA (United States)

We study the dynamics of a tunable 2D active nematic liquid crystal composed of microtubules and kinesin motors confined to an oil–water interface. Kinesin motors continuously inject mechanical energy into the system through ATP hydrolysis, powering the relative microscopic sliding of adjacent microtubules, which in turn generates macroscale autonomous flows and chaotic dynamics. We use particle image velocimetry to quantify two-dimensional flows of active nematics and extract their statistical properties. In agreement with the hydrodynamic theory, we find that the vortex areas comprising the chaotic flows are exponentially distributed, which allows us to extract the characteristic system length scale. We probe the dependence of this length scale on the ATP concentration, which is the experimental knob that tunes the magnitude of the active stress. In conclusion, our data suggest a possible mapping between the ATP concentration and the active stress that is based on the Michaelis–Menten kinetics that governs the motion of individual kinesin motors.

View Accepted Manuscript (DOE)

Research Organization:: Brandeis University, Waltham, MA (United States); University of California, Santa Barbara, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0010432

OSTI ID:: 1659763

Alternate ID(s):: OSTI ID: 1503729
OSTI ID: 1611421

Journal Information:: Soft Matter, Journal Name: Soft Matter Journal Issue: 15 Vol. 15; ISSN 1744-683X

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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Topological chaos in active nematics Tan, Amanda J.; Roberts, Eric; Smith, Spencer A. Nature Physics, Vol. 15, Issue 10 https://doi.org/10.1038/s41567-019-0600-y	journal	August 2019
Self-organized dynamics and the transition to turbulence of confined active nematics Opathalage, Achini; Norton, Michael M.; Juniper, Michael P. N. Proceedings of the National Academy of Sciences, Vol. 116, Issue 11 https://doi.org/10.1073/pnas.1816733116	journal	February 2019
Self-organized dynamics and the transition to turbulence of confined active nematics Opathalage, Achini; Norton, Michael M.; Juniper, Michael P. N. arXiv https://doi.org/10.48550/arxiv.1810.09032	text	January 2018

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