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@INPROCEEDINGS{Dhont:1009601,
author = {Dhont, Jan K. G. and Kang, Kyongok},
title = {{E}lectric-field induced phases/states in suspensions of
highly charged rod-like colloids},
school = {HHU},
reportid = {FZJ-2023-02916},
year = {2023},
abstract = {After a short introduction to colloids and liquid crystals,
I will discuss the response of concentrated suspensions of
highly charged, very long and thin, rod-like colloids to
external electric fields. Fd-virus particles are used as a
model system for such rod-like colloids. These virus
particles consist of a dsDNA strand of a length of 880 nm,
which is covered by 2700 coat proteins, leading a core
thickness of 7 nm. The coat proteins give rise a very large
surface charge density of the fd-virus particles, which
results in a large number of condensed ions close to the
surface of the particles. Depending on the amplitude and
frequency of the external field, transitions from a nematic
to chiral nematic, and from a chiral nematic to a
homeotropic phase are found. In addition, a field-induced
dynamical state can be induced, where nematic domains
persistently melt and reform. The time scale on which
melting and reforming of nematic domains occurs, and the
size of the domains, both diverge at what could be
identified as a “non-equilibrium critical point”. An
explanation of these phenomena is presented, both on an
intuitive level and based on appropriate equations of motion
for the orientational order parameter, where the
field-induced dissociation/associated of condensed ions
plays an important role.},
month = {May},
date = {2023-05-25},
organization = {Honorary doctorate by the Faculty of
Science at Lund University, Lund
(Sweden), 25 May 2023 - 25 May 2023},
subtyp = {Invited},
cin = {IBI-4},
cid = {I:(DE-Juel1)IBI-4-20200312},
pnm = {5243 - Information Processing in Distributed Systems
(POF4-524)},
pid = {G:(DE-HGF)POF4-5243},
typ = {PUB:(DE-HGF)31},
url = {https://juser.fz-juelich.de/record/1009601},
}