BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:Reconfigurable soft active matter: From liquid crystal skyrmions t
 o nanoswimmers and ultrasound-powered microspinners - Mykola Tasinkevych (
 Nottingham Trent University)
DTSTART:20231206T110000Z
DTEND:20231206T120000Z
UID:TALK208726@talks.cam.ac.uk
DESCRIPTION:This talk will present three classes of active particles: i) L
 iquid crystal skyrmions activated by time-periodic electric fields\, with 
 the skyrmion velocity tuneable by the field amplitude and frequency. A col
 lective variable model of the skyrmion dynamics will be discuss. The model
  relates the skyrmion motion to the reorientation dynamics of the far-fiel
 d director and dynamics of the width of the twist wall around the skyrmion
  core. ii) A chemical nanoswimmer moving in a ratchet potential will be co
 nsidered\, where the ratchet potential is additionally &ldquo\;rocked&rdqu
 o\; in the transverse direction. As a result of the mechanochemical coupli
 ng\, the self-propulsion velocity probes the potential energy landscape an
 d particle trajectories are rectified in the direction of the ratchet modu
 lation. The magnitude and direction of the net current depend upon both th
 e rocking amplitude and the frequency. iii) Finally\, the dynamics of gold
  microplates with twisted star shape (&nbsp\;symmetry) moving within the n
 odal plane of a uniform acoustic field will be presented. The relationship
  between the particle shape and its rotational motion is quantified by var
 ying the shape of these spinners. The experimental observations are explai
 ned by a hydrodynamic model that describes the steady streaming flows and 
 particle motions induced by ultrasonic actuation.
LOCATION:Seminar Room 2\, Newton Institute
END:VEVENT
END:VCALENDAR