| Title: | Microfluidic control over topological states in channel-confined nematic flows |
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| Authors: | ID Čopar, Simon (Author)
ID Kos, Žiga (Author)
ID Emeršič, Tadej (Author)
ID Tkalec, Uroš (Author) |
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| Files: |  Copar-2020-Microfluidic_control_over_topologic.pdf (7,79 MB)
MD5: 63400E45FE05ACB87484108B5CEBBCB7
 https://doi.org/10.1038/s41467-019-13789-9
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| Language: | English |
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| Work type: | Scientific work |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: | FNM - Faculty of Natural Sciences and Mathematics
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| Abstract: | 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. |
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| Keywords: | nematic liquid crystals, microfluidics, topological states, nematic flows |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Submitted for review: | 28.07.2019 |
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| Article acceptance date: | 28.11.2019 |
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| Publication date: | 02.01.2020 |
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| Publisher: | Nature Publishing Group |
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| Year of publishing: | 2020 |
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| Number of pages: | Str. 1-10 |
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| Numbering: | Letn. 11, št. članka 59 |
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| PID: | 20.500.12556/DKUM-91564  |
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| UDC: | 532.5 |
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| ISSN on article: | 2041-1723 |
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| COBISS.SI-ID: | 3400804 |
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| DOI: | 10.1038/s41467-019-13789-9 |
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| Publication date in DKUM: | 15.01.2025 |
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| Views: | 171 |
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| Downloads: | 14 |
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| Metadata: |    |
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| Categories: | Misc.
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