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07 April 2023
Article (Scientific journals)
Curvature-mediated Programming of Liquid Crystal Microflows
Fedorowicz, Kamil; Prosser; Sengupta, Anupam
2023In Soft Matter
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Keywords :
curvature; liquid crystals; microfluidics
Abstract :
[en] Using experiments and numerical simulations, we demonstrate that the curvature of microscale conduits allow programming of liquid crystal (LC) flows. Focusing on a nematic LC flowing through U- and L-shaped channels of rectangular cross-section, our results reveal that curved flow paths can trigger gradients of flow-induced director field in the transverse direction. The emergent director field feeds back into the flow field, ultimately leading to LC flows controlled by the channel curvature. This curvature-mediated flow control, identified by polarizing optical microscopy and supported by the nematofluidic solutions, offers novel concepts in LC-based microfluidic valves and throttles, wherein the throughput distribution is determined by the Ericksen number and the variations in the local curvature. Finally, this work highlights the role of deformation history on flow-induced director alignments, when the viscous and elastic effects comparable in strength.
Disciplines :
Author, co-author :
Fedorowicz, Kamil
Sengupta, Anupam ;  University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS)
External co-authors :
Language :
Title :
Curvature-mediated Programming of Liquid Crystal Microflows
Publication date :
29 August 2023
Journal title :
Soft Matter
Publisher :
Royal Society of Chemistry, Cambridge, United Kingdom
Peer reviewed :
Peer Reviewed verified by ORBi
Focus Area :
Physics and Materials Science
FnR Project :
FNR11572821 > Anupam Sengupta > MBRACE > Biophysics Of Microbial Adaptation To Fluctuations In The Environment > 15/05/2018 > 14/05/2023 > 2017
Funders :
FNR - Fonds National de la Recherche


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