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MPIDS Colloquium

MPIDS Colloquium: Onset and control of flows in microtubule-based active nematics

  • Date: Jan 23, 2019
  • Time: 14:15 - 15:15
  • Speaker: Prof. Francesc Sagués
  • Department of Materials Science and Physical Chemistry, Universitat de Barcelona
  • Location: Max-Planck-Institut für Dynamik und Selbstorganisation (MPIDS)
  • Room: Prandtl Lecture Hall
  • Host: MPIDS
  • Contact: andrej.vilfan@ds.mpg.de
Microtubule-based systems are viewed as minimal in vitro reconstitutions of the cytoskeleton. They are made active by mixing them with kinesin proteins fueled with ATP. When this material is two-dimensionally interfaced with oil, it conforms nematic textures pervaded by topological defects and active flows on large length scales.
I will present experimental results corresponding to different scenarios of this active nematic prepa-ration. First, I will introduce recent results relative to the onset dynamics and fully characterization of a turbulent-like regime, identifying the basic length scales and involved instability mechanisms [1, 2]. Later, a strategy of control of these active flows will be commented, based on patterning the vis-cous coupling of the active nematic at the oily interface [3]. Finally, I will refer to situations of ac-tive nematics droplets, dispersed in isotropic and anisotropic oils (liquid crystals) as well [4]. In the latter case, exotic dynamical regimes arising from the coupling of active and passive topological de-fects will be discussed.

[1] B. Martinez et al., Nature Physics (accepted for publication)
[2] P. Guillamat et al. Nat. Comm. 8:564, 2017
[3] P. Guillamat et al., PNAS 114, 5498, 2016
[4] P. Guillamate et al., Sci. Adv. 4:eeao1470, 2018
 
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