[LoopNet] Next Looping Meeting (28/10/2024)

[Stanisław Żukowski]

Dear Looping Networks Enthusiasts,

I hope you had a wonderful summer time and that you have already settled
into the duties of the academic year. We would like to invite you all to
the upcoming season of the Looping Networks Meetings. This year we will
meet on *Mondays at 15:00 CET *(Warsaw/Paris time), about twice a month.

The first Looping Meeting in this series will take place on *Monday,
October 28, 2024, at 15:00* *Warsaw time* (10 am New York time*)*, *during
which *Qing Zhang *from Stanford University will give a talk: *"Flow
instabilities in nematic liquid crystals: from viscous fingering to
spontaneous chirality"*.

**Please note the unusual time difference between the EU and the US next
week due to the EU switching to winter time one week before the US.*

*Abstract*:
While flow instabilities lead to complex patterns that can be harnessed to
create functional structures, controlling their self-amplified and
non-linear growth remains challenging. In this talk, I will present how we
exploit shear-enhanced anisotropy in lyotropic chromonic liquid crystal
(LCLC) solutions to control the growth morphology of viscous-fingering
instability that occurs when a less viscous fluid displaces a more viscous
one between two parallel plates. By adjusting flow conditions, we induce a
transition from the generic dense-branching growth characterized by
repeated tip-splitting of the growing fingers to dendritic patterns with
stable fingertips. Furthermore, we have discovered the emergence of
flow-induced defects and structures in LCLC solutions themselves.
Pure-twist disclination loops form under specific shear rates due to the
material's unique elastic properties. Remarkably, chiral domains
spontaneously arise in the achiral LCLC when subjected to pressure-driven
flow. This chirality results from periodic double-twist deformations,
leading to striking stripe patterns perpendicular to the flow direction. I
will discuss the mechanisms behind these phenomena, revealing a distinct
pathway to mirror symmetry breaking in fluid systems.
[image: image.png]

Herewith the link:
https://uw-edu-pl.zoom.us/j/96517828822

Looking forward to seeing you all!
With kind regards,
Stanisław Żukowski
Annemiek Cornelissen
John Shaw


The upcoming schedule:
18-Nov-2024 Nathan Moore, University of Arkansas
2-Dec-2024 Andres Baresch, University of Maryland
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