Action of fields on captive disclination loops

  • Mallory Dazza
  • Rui Cabeça
  • Simon Čopar
  • Maria Helena Godinho
  • Pawel Pieranski
Regular Article

Abstract.

We report on two effects observed in experiments with captive disclination loops on polymeric fibers immersed in nematics and submitted to electric and/or magnetic fields. We show that the magnetic field oblique to a fiber with axial or helicoidal anchoring on its surface induces translation of disclination loops. Fields orthogonal to fibers with helicoidal anchoring make disclination loops rotate around the field direction. In the linear regime of this last chirogyral effect, the angle of rotation is proportional to the helix wave vector and its sense unveils the chirality of the helix. We propose a model explaining the origin and all features of these two effects.

Graphical abstract

Keywords

Soft Matter: Liquid crystals 

References

  1. 1.
    G. Friedel, Ann. Phys. 18, 273 (1922)Google Scholar
  2. 2.
    V.S.U. Fazio, L. Komitov, S.T. Lagerwall, Liq. Cryst. 24, 427 (1998)CrossRefGoogle Scholar
  3. 3.
    V.S.U. Fazio, L. Komitov, Europhys. Lett. 46, 38 (1999)ADSCrossRefGoogle Scholar
  4. 4.
    V.S.U. Fazio, L. Komitov, C. Raduge, S.T. Lagerwall, H. Motschmann, Eur. Phys. J. E 5, 309 (2001)CrossRefGoogle Scholar
  5. 5.
    P. Oswald, P. Pieranski, Nematic and Cholesteric Liquid Crystals (Taylor&Francis, 2005) see Fig. B.IV.18Google Scholar
  6. 6.
    P. Pieranski, M.H. Godinho, S. Čopar, Phys. Rev. E 94, 042706 (2016)ADSCrossRefGoogle Scholar
  7. 7.
    R.W. Ruhwandl, E.M. Terentjev, Phys. Rev. E 56, 5561 (1997)ADSCrossRefGoogle Scholar
  8. 8.
    H. Stark, Eur. Phys. J. B 10, 311 (1999)ADSCrossRefGoogle Scholar
  9. 9.
    J.C. Loudet, P. Poulin, Phys. Rev. Lett. 87, 165503-1 (2001)ADSCrossRefGoogle Scholar
  10. 10.
    I. Musevič, M. Skarabot, U. Tkalec, M. Ravnik, S. Zumer, Science 313, 954 (2006)ADSCrossRefGoogle Scholar
  11. 11.
    Y. Geng, P.L. Almeida, J.L. Figueirinhas, E.M. Terentjev, M.H. Godinho, Soft Matter 8, 3634 (2012)ADSCrossRefGoogle Scholar
  12. 12.
    Y. Geng, D. Seč, P.L. Almeida, O.D. Lavrentovich, S. Zumer, M.H. Godinho, Soft Matter 9, 7928 (2013)ADSCrossRefGoogle Scholar
  13. 13.
    M. Nikkhou, M. Skarabot, S. Čopar, M. Ravnik, S. Zumer, I. Muševič, Nat. Phys. 11, 183 (2015)CrossRefGoogle Scholar
  14. 14.
    M. Nikkhou, M. Skarabot, I. Muševič, Eur. Phys. J. E 38, 23 (2015)CrossRefGoogle Scholar
  15. 15.
    S. Čopar, D. Seč, L.A. Aguire, P.L. Almeida, M. Dazza, M. Ravnik, M.H. Godinho, P. Pieranski, S. Zumer, Phys. Rev. E 93, 032703 (2016)ADSGoogle Scholar
  16. 16.
    L.E. Aguirre, A. de Olivera, D. Seč, S. Čopar, P.L. Almeida, M. Ravnik, M.H. Godinho, S. Zumer, Proc. Natl. Acad. Sci. U.S.A. 113, 1174 (2016)ADSCrossRefGoogle Scholar
  17. 17.
    K.A. Takeuchi, M. Sano, Phys. Rev. Lett. 104, 230601-1-4 (2010)ADSCrossRefGoogle Scholar
  18. 18.
    P.-G. de Gennes, J. Prost, The Physics of Liquid Crystals, 2nd edn. (Oxford University Press, 1993) chapt. 5.3Google Scholar
  19. 19.
    M.H. Godinho, P. Pieranski, P. Sotta, Eur. Phys. J. E 39, 89 (2016)CrossRefGoogle Scholar
  20. 20.
    R.S. Werbowyj, D.G. Gray, Macromolecules 17, 1512 (1984)ADSCrossRefGoogle Scholar

Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  • Mallory Dazza
    • 1
    • 2
  • Rui Cabeça
    • 3
  • Simon Čopar
    • 4
  • Maria Helena Godinho
    • 3
  • Pawel Pieranski
    • 1
  1. 1.Laboratoire de Physique des SolidesUniversité Paris-SudOrsayFrance
  2. 2.École normale supérieure de CachanCachanFrance
  3. 3.CENIMAT, Faculdade de Ciências e TecnologiaUniversidade Nova de LisboaCaparicaPortugal
  4. 4.Faculty of Mathematics and PhysicsUniversity of LjubljanaLjubljanaSlovenia

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