Do Lehmann cholesteric droplets subjected to a temperature gradient rotate as rigid bodies?

We performed a Fluorescence Recovery After Photobleaching (FRAP) experiment during the Lehmann rotation of cholesteric droplets in thermodynamic coexistence with the isotropic liquid and subjected to a temperature gradient. By creating and tracking bleached spots near the surface of banded droplets...

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Bibliographic Details
Published in:Soft matter 2016-01, Vol.12 (9), p.264-2611
Main Authors: Poy, Guilhem, Oswald, Patrick
Format: Article
Language:English
Subjects:
Bleaching
Droplets
Liquids
Rigid-body dynamics
Surface layer
Temperature gradient
Texture
Tracking
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Summary:We performed a Fluorescence Recovery After Photobleaching (FRAP) experiment during the Lehmann rotation of cholesteric droplets in thermodynamic coexistence with the isotropic liquid and subjected to a temperature gradient. By creating and tracking bleached spots near the surface of banded droplets (in which the cholesteric helix is perpendicular to the gradient) and concentric circle droplets oriented by an electric field (in which the helix is parallel to the gradient), we found that neither type of droplet rotates as a solid. This result shows that the texture rotation is mainly due to the local director rotation. We show that Lehmann cholesteric droplets submitted to a temperature gradient never rotate as a solid, whatever their internal texture.
ISSN:1744-683X
1744-6848
DOI:10.1039/c5sm02906f