20.500.12556/RUL-128776 Microfluidic control over topological states in channel-confined nematic flows Compared to isotropic liquids, orientational order of nematic liquid crystals makes their rheological properties more involved, and thus requires fine control of the flow parameters to govern the orientational patterns. In microfluidic channels with perpendicular surface alignment, nematics discontinuously transition from perpendicular structure at low flow rates to flow-aligned structure at high flow rates. Here we show how precise tuning of the driving pressure can be used to stabilize and manipulate a previously unresearched topologically protected chiral intermediate state which arises before the homeotropic to flow-aligned transition. We characterize the mechanisms underlying the transition and construct a phenomenological model to describe the critical behaviour and the phase diagram of the observed chiral flow state, and evaluate the effect of a forced symmetry breaking by introduction of a chiral dopant. Finally, we induce transitions on demand through channel geometry, application of laser tweezers, and careful control of the flow rate. nematic liquid crystals microfluidics nematski tekoči kristali mikrofluidika true false true Angleški jezik Slovenski jezik Članek v reviji 2021-07-28 14:28:04 2021-07-28 14:28:10 2022-09-07 04:17:08 0000-00-00 00:00:00 2020 0 0 10 str. art. 59 Vol. 11 Jan. 2020 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 532.5 2041-1723 10.1038/s41467-019-13789-9 3400804 RAZ_Copar_Simon_2020.pdf RAZ_Copar_Simon_2020.pdf 1 0067A51A5CB9731DDF1759F7402303AF 17034cdbd3b8b9970e58f60569d12f2f19cd75b0bdee0a648cfc49f51106c354 1a4ca1c9-ef9f-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=145648 https://www.nature.com/articles/s41467-019-13789-9 0 642a3190-ef9f-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=145649 Fakulteta za matematiko in fiziko Medicinska fakulteta 0 0 0