7 papers
Density-Dependent Transition in Bacterial Self-Organization Driven by Confinement and Aerotaxis
Minjun Kim, Joonwoo Jeong
We experimentally investigate how aerotactic bacteria, confined within a thin liquid film between two solid substrates, respond to a controlled oxygen gradient. We find that the to…
Molecular Origin of UV-Induced Irreversible Phase Changes in a Chromonic Liquid Crystal
Junghoon Lee, Seonghun Jeong, Jung-Min Kee +1
Aqueous solutions of disodium cromoglycate (DSCG), a representative model system for chromonic liquid crystals, exhibit temperature- and concentration-dependent phase behaviors spa…
Anisotropic Diffusion in Lyotropic Chromonic Liquid Crystal using Fluorescence Recovery After Photobleaching
Kyu Hwan Choi, Jiyong Cheon, Joonwoo Jeong +1
Anisotropic diffusion governs transport in a wide range of soft and biological materials, where microstructure and molecular interactions jointly shape how matter moves. Here, we q…
Magnetically controlled double-twist director configuration of lyotropic chromonic liquid crystals in cylinders: Energetics, topological defects, and instability
Junghoon Lee, Joonwoo Jeong
We study experimentally how the double-twist (DT) configuration of cylindrically confined lyotropic chromonic liquid crystals (LCLCs) responds to axial magnetic fields. Our directo…
Motility Modulates the Partitioning of Bacteria in Aqueous Two-Phase Systems
Jiyong Cheon, Kyu Hwan Choi, Kevin J. Modica +3
We study the partitioning of motile bacteria in an aqueous two-phase mixture of dextran (DEX) and polyethylene glycol (PEG), which can phase separate into DEX-rich and PEG-rich pha…
Solvent isotopic effect on the phase transition of lyotropic chromonic liquid crystals: Heavy water makes mesogens less charged
Jiyong Cheon, Joonwoo Jeong
The interplay among solute and solvent molecules in lyotropic mesophases governs their physicochemical properties, such as phase behaviors and viscoelasticity. In our model system,…