Physics of the dowser texture

Pawel Pieranski, Maria Helena Godinho

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review

Abstract

The generic experiment started with the homeotropic texture filling the droplet, except for an annular domain of residual dowser texture in vicinity of the meniscus. Since the discovery of its persistence, the dowser texture was studied with the particular aim of generating and manipulating monopoles. The experiments started by the generation of a unique homeotropic-in-dowser domain by means of a reduction of the gap slide/lens thickness to zero. CDC2 was tailored for the winding of the dowser texture and for experiments on the generation, motions and collisions of dowsons. All experiments on the flow-assisted homeotropic-dowser transition were made with 4-cyano-4’-pentylbiphenyl (5CB). Values of the flexo-electric polarizations in MBBA and 5CB have been measured in experiments performed with weak enough electric field to neglect the contribution of the second-order term due to dielectric anisotropy. An experiment performed with 5CB provides evidence of electro-osmotic flows in a wound up dowser texture submitted to a strong electric field.
Original languageEnglish
Title of host publicationLiquid Crystals
Subtitle of host publicationNew Perspectives
EditorsPawel Pieranski, Maria Helena Godinho
Place of PublicationLondon
PublisherISTE
Chapter4
Pages193-309
Number of pages116
Edition1st
ISBN (Electronic)978-111985080-9
ISBN (Print)978-178945040-8
DOIs
Publication statusPublished - 13 Aug 2021

Publication series

NameSciences: Physics of Soft Matter: Lyotropic and Thermotropic Liquid Crystals

Keywords

  • 4-cyano-4’-pentylbiphenyl
  • dowser texture
  • electro-osmotic flows
  • flexo-electric polarizations
  • homeotropic texture
  • homeotropic-dowser transition

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