Article (Scientific journals)
Micrometer-Scale Porous Buckling Shell Actuators Based on Liquid Crystal Networks
Jampani, Venkata; Mulder, Dirk; Reguengo de Sousa, Kevin et al.
2018In Advanced Functional Materials, 28 (31), p. 1801209
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Keywords :
buckling; liquid crystal elastomer actuators; microfluidics; spherical topology
Abstract :
[en] Micrometer‐scale liquid crystal network (LCN) actuators have potential for application areas like biomedical systems, soft robotics, and microfluidics. To fully harness their power, a diversification in production methods is called for, targeting unconventional shapes and complex actuation modes. Crucial for controlling LCN actuation is the combination of macroscopic shape and molecular‐scale alignment in the ground state, the latter becoming particularly challenging when the desired shape is more complex than a flat sheet. Here, one‐step processing of an LCN precursor material in a glass capillary microfluidic set‐up to mold it into thin shells is used, which are stretched by osmosis to reach a diameter of a few hundred micrometers and thickness on the order of a micrometer, before they are UV crosslinked into an LCN. The shells exhibit radial alignment of the director field and the surface is porous, with pore size that is tunable via the osmosis time. The LCN shells actuate reversibly upon heating and cooling. The decrease in order parameter upon heating induces a reduction in thickness and expansion of surface area of the shells that triggers continuous buckling in multiple locations. Such buckling porous shells are interesting as soft cargo carriers with capacity for autonomous cargo release.
Disciplines :
Physics
Author, co-author :
Jampani, Venkata ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
Mulder, Dirk;  Technical University of Eindhoven
Reguengo de Sousa, Kevin ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
Gélébart, Anne-Hélène;  Technical University of Eindhoven
Lagerwall, Jan  ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
Schenning, Albertus P.H.J.
External co-authors :
yes
Language :
English
Title :
Micrometer-Scale Porous Buckling Shell Actuators Based on Liquid Crystal Networks
Publication date :
05 June 2018
Journal title :
Advanced Functional Materials
ISSN :
1616-3028
Publisher :
John Wiley & Sons, Weinheim, United Kingdom
Volume :
28
Issue :
31
Pages :
1801209
Peer reviewed :
Peer Reviewed verified by ORBi
Focus Area :
Physics and Materials Science
European Projects :
H2020 - 648763 - INTERACT - Intelligent Non-woven Textiles and Elastomeric Responsive materials by Advancing liquid Crystal Technology
FnR Project :
FNR11703329 - Template-free Reconfigurable Nematic Defect-arrays For Designing Self-organisable Topological Three-dimensional Elastomer Responsive-rafts, 2017 (15/11/2017-14/10/2020) - Venkata Subba Rao Jampani
Funders :
CE - Commission Européenne [BE]
Available on ORBilu :
since 13 December 2018

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