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Title: Healing of defects at the interface of nematic liquid crystals and structured Langmuir-Blodgett monolayers
Author: Petit Garrido, Núria
Trivedi, Rahul P.
Ignés i Mullol, Jordi
Claret Bonet, Josep
Lapointe, Clayton
Sagués i Mestre, Francesc
Smalyukh, I.
Keywords: Cristalls líquids
Química de superfícies
Cristalls líquids nemàtics
Liquid crystals
Surface chemistry
Nematic liquid crystals
Issue Date: 21-Oct-2011
Publisher: American Physical Society
Abstract: We use Langmuir-Blodgett molecular monolayers and nematic liquid crystals as model two-and three-dimensional orientationally ordered systems to study the stability and healing of topological defects at their contact interfaces. Integer-strength defects at the monolayer induce disclinations of similar strength in the nematic that, however, do not propagate deep into the bulk, but rather form single- or double-split arch-shaped loops pinned to the interface. This behavior is qualitatively independent of the far-field director orientation and involves either half-integer singular or twist-escaped unity-strength nonsingular nematic disclinations. These two defect configurations can be selected by varying sample preparation given their comparable free energy, consistently with direct probing by use of laser tweezers.
Note: Reproducció del document publicat a:
It is part of: Physical Review Letters, 2011, vol. 107, p. 177801-177801
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ISSN: 0031-9007
Appears in Collections:Articles publicats en revistes (Ciència dels Materials i Química Física)

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