Reference : Time dependent lyotropic chromonic textures in PDMS-based microfluidic confinements
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
Physics and Materials Science
http://hdl.handle.net/10993/46346
Time dependent lyotropic chromonic textures in PDMS-based microfluidic confinements
English
Sharma, Anshul mailto [University of Luxembourg- FSTM > Department of Physics and Materials Science]
Ong, Irvine mailto [University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS) >]
Sengupta, Anupam mailto [University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS) >]
Jan-2021
Crystals
MDPI AG
11
1
Early Career Stars of the Decade
Yes (verified by ORBilu)
International
2073-4352
[en] lyotropic chromonic liquid crystals ; microfluidics ; surface anchoring ; phase transition ; herringbone ; spherulite ; textures
[en] Nematic and columnar phases of lyotropic chromonic liquid crystals (LCLCs) have been long studiedfor their fundamental and applied prospects in material science and medical diagnostics. LCLC phasesrepresent different self-assembled states of disc-shaped molecules, held together by noncovalentinteractions that lead to highly sensitive concentration and temperature dependent properties. Yet,microscale insights into confined LCLCs, specifically in the context of confinement geometry andsurface properties, are lacking. Here, we report the emergence of time dependent textures in staticdisodium chromoglycate (DSCG) solutions, confined in PDMS-based microfluidic devices. We use acombination of soft lithography, surface characterization and polarized optical imaging to generateand analyze the confinement-induced LCLC textures, and demonstrate that over time, herringboneand spherulite textures emerge due to spontaneous nematic (N) to columnar M-phase transition,propagating from the LCLC-PDMS interface into the LCLC bulk. By varying the confinementgeometry, anchoring conditions and the initial DSCG concentration, we can systematically tune thetemporal dynamics of the N to M-phase transition and textural behaviour of the confined LCLC. Sincestatic molecular states register the initial conditions for LC flows, the time dependent boundary andbulk conditions reported here suggest that the local surface-mediated dynamics could be central inunderstanding LCLC flows, and in turn, the associated transport properties of this versatile material.
Fonds National de la Recherche - FnR
Researchers ; Professionals ; Students ; General public
http://hdl.handle.net/10993/46346
10.3390/cryst11010035
https://www.mdpi.com/2073-4352/11/1/35
FnR ; FNR11572821 > Anupam Sengupta > MBRACE > Biophysics Of Microbial Adaptation To Fluctuations In The Environment > 15/05/2018 > 14/05/2023 > 2017

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