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[Fizinfo] Szemináriumok - Seminars: Robin Selinger,Jonathan Selinger

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  • From: Szeminárium koordinátor <sem-admin AT>
  • To: SZFI Szeminárium <seminar AT>,Fizinfo <fizinfo AT>
  • Cc: Fizinfo <fizinfo AT>
  • Subject: [Fizinfo] Szemináriumok - Seminars: Robin Selinger,Jonathan Selinger
  • Date: Sat, 2 Jul 2022 06:00:02 +0200 (CEST)
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SZFI SeminarRobin SelingerKent State University (vendéglátó: Salamon
Péter)Frank-Read sources in nematic liquid crystals: engineered mechanism for
heterogeneous defect nucleationThursday, 7 July 2022, 10:00, Bldg 1,
Meeting ID: 873 2909 2467 Passcode: 174961The Frank-Read (F-R) source, a
well-studied concept in metallurgy, is a mechanism by which dislocation loops
are emitted via repeated heterogeneous nucleation, giving rise to ductility
in crystalline solids. We demonstrate that the same fundamental mechanism
enables multiplication of disclination loops in nematic liquid crystals under
shear. And while F-R sources form randomly in deformed crystals e.g. through
dislocation pinning by impurities, by contrast we can precisely engineer F-R
sources in a nematic liquid crystal cell by inscribing anchoring patterns on
the confining substrates. We discuss possible applications in passive and
active nematics.&nbsp;&nbsp;SZFI SeminarJonathan SelingerKent State
University (vendéglátó: Salamon Péter)Geometry and Mechanics of Disclinations
in Nematic Liquid CrystalsThursday, 7 July 2022, 10:30, Bldg 1, auditorium,
Meeting ID: 873 2909 2467 Passcode: 174961In this talk, we present recent
progress in understanding topological defects in liquid crystals, both
conventional and active. We emphasize that topology is only one part of the
theory of topological defects. Beyond topology, we need geometry to
characterize the orientational properties of defects. We need energy and
forces to understand the interactions between defects, and the conventional
and active stimuli acting on them. Further, we need dynamics to understand
the motion of defects under these forces, in the presence of dissipation. We
discuss all of these aspects of the theory of defects in both two and three
dimensions.&nbsp;Minden érdeklődőt szívesen látunk! - Everyone is welcome to
attend.Róbert Juhászsem-admin AT

  • [Fizinfo] Szemináriumok - Seminars: Robin Selinger,Jonathan Selinger, Szeminárium koordinátor, 07/02/2022

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