Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.21/2757
Título: Liquid crystal necklaces: cholesteric drops threaded by thin cellulose fibres
Autor: Geng, Yong
Sec, David
Almeida, Pedro Lúcio Maia Marques de
Lavrentovich, Oleg D.
Zumer, Slobodan
Godinho, Maria Helena
Palavras-chave: Topological defects
Nematic droplets
Microdroplets
Colloids
Lasers
Data: 2013
Editora: Royal Soc Chemistry
Citação: GENG, Yong; SEC, David; ALMEIDA, Pedro L.; LAVRENTOVICH, Oleg D.; ZUMER, Slobodan; GODINHO, Maria H. - Liquid crystal necklaces: cholesteric drops threaded by thin cellulose fibres. Soft Matter. ISSN 1744-683X. Vol. 9, nr 33 (2013), p. 7928-7933.
Resumo: Liquid crystals in confined geometries exhibit numerous complex structures often including topological defects that are controlled by the nematic elasticity, chirality and surface anchoring. In this work, we study the structures of cholesteric droplets pierced by cellulose fibres with planar anchoring at droplet and fibre surfaces. By varying the temperature we demonstrate the role of twisting power and droplet diameter on the equilibrium structures. The observed structures are complemented by detailed numerical simulations of possible director fields decorated by defects. Three distinct structures, a bipolar and two ring configurations, are identified experimentally and numerically. Designing cholesteric liquid crystal microdroplets on thin long threads opens new routes to produce fibre waveguides decorated with complex microresonators.
Peer review: yes
URI: http://hdl.handle.net/10400.21/2757
ISSN: 1744-683X
Aparece nas colecções:ISEL - Física - Artigos



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