Controlling an active nematic fluid with curvature and topology

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• Dan Pearce (University of Geneva, Switzerland)
• Wednesday 16 January 2019, 14:00-15:00
• Bryan Matthews Room, Physiology Building, Department of Physiology, Development and Neuroscience, Downing Site.

If you have a question about this talk, please contact Dr. Adrien Hallou.

Active nematic liquid crystals are achieved experimentally by combining high concentrations of microtubules, kinesin and ATP . These active nematic suspensions can then be localized to a 2D interface, such as the surface of a water droplet suspended in another medium. We will discuss the distribution of topological defects within an active nematic liquid crystal confined to the surface of a toroidal water droplet. Due to the topology of the surface, it is possible to coat a torus in a nematic material with no topological defects. When the activity of the nematic is sufficiently high, topological defects will spontaneously form, but they must preserve the net topological charge of the system, which is zero. Through experiment and simulation we confirm that the local distribution of topological defects is proportional to the Gaussian curvature. As the activity of the system is increased the reliance on the Gaussian curvature is diminished and the available area on different regions of the torus dictates the behavior.

This talk is part of the Theory of Living Matter Group series.

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