Article (Scientific journals)
Spatio-temporal programming of lyotropic phase transition in nanoporous microfluidic confinements
Ulaganathan, Vamseekrishna; SENGUPTA, Anupam
2023In Journal of Colloid and Interface Science
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Keywords :
lyotropic liquid crystals; phase transition; microfluidics; programming; nanoporous
Abstract :
[en] The nanoporous polydimethylsiloxane (PDMS) surfaces of a rectangular microfluidic channel, selectively uptakes water molecules, concentrating the solute molecules in an aqueous phase, that could drive phase transitions. Factors such as surface wettability, channel geometry, the surface-to-volume ratio, and surface topography of the confinements could play a key role in tuning the phase transitions spatio-temporally. Here, using a lyotropic chromonic liquid crystal as model biological material, confined within nanoporous microfluidic environments, we study molecular assembly driven by nanoporous substrates. Using a combination of timelapse polarized imaging, quantitative image processing, and a simple mathematical model, we analyze the phase transitions and construct a master diagram capturing the role of surface wettability, channel geometry and embedded topography on programmable lyotropic phase transitions. Intrinsic PDMS nanoporosity and confinement cross-section, together with the imposed wettability regulate the rate of the N-M phase transition; whereas the microfluidic geometry and embedded topography enable phase transition at targeted locations. We harness the emergent long-range order during N-M transition to actuate elasto-advective transport of embedded micro-cargo, demonstrating particle manipulation concepts governed by tunable phase transitions. Our results present a programmable physical route to material assembly in microfluidic environment, and offer a new paradigm for assembling genetic components, biological cargo, and minimal synthetic cells.
Disciplines :
Physics
Author, co-author :
Ulaganathan, Vamseekrishna
SENGUPTA, Anupam  ;  University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS)
External co-authors :
no
Language :
English
Title :
Spatio-temporal programming of lyotropic phase transition in nanoporous microfluidic confinements
Publication date :
05 June 2023
Journal title :
Journal of Colloid and Interface Science
ISSN :
0021-9797
eISSN :
1095-7103
Publisher :
Elsevier, Atlanta, United States - Florida
Peer reviewed :
Peer Reviewed verified by ORBi
Focus Area :
Physics and Materials Science
FnR Project :
FNR13719464 - Topological Fluid Mechanics: Decoding Emergent Dynamics In Anisotropic Fluids And Living Systems, 2019 (01/09/2020-31/08/2023) - Anupam Sengupta
Funders :
FNR - Fonds National de la Recherche
Available on ORBilu :
since 06 June 2023

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