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CATEGORIES:Isaac Newton Institute Seminar Series
SUMMARY:Medium- and particle-shape effects on electric dou
ble layers - Jeffrey Everts (University of Ljublja
na )
DTSTART;TZID=Europe/London:20190424T150000
DTEND;TZID=Europe/London:20190424T170000
UID:TALK123691AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/123691
DESCRIPTION:Charged surfaces in contact with liquids containin
g ions are accompanied in equilibrium by an
ele
ctric double layer consisting of a layer of electr
ic charge on the surface that is screened by a dif
fuse ion
cloud in the bulk fluid. This screenin
g cloud determines not only the interactions betwe
en charged
colloidal particles or poly- electro
lytes and their self-assembly into ordered structu
res [1]\, but also on how
the interaction of a
charged colloidal particle with an oil-water inter
face can be tuned from attractive to
repulsive
by varying the salt concentration\, as we will dis
cuss in this talk [2]. In the second part of this<
br>talk we will discuss to what spatial complexity
the electric double layers can be designed. We sh
ow that
electric double layers of non-trivial t
opology -including tori\, multi-tori and knots- ca
n be realised in
charged colloids with complex-
shaped particles\, using numerical modelling. We s
how that the topology
of double layers can be d
efined via a cut-off in the ion concentration with
out any loss of generality\, and
demonstrate th
at the double layer topology can be tuned by chang
ing the Debye screening length of the
medium\,
or by changing the shape and topology of the (coll
oidal) particle [3]. If time permits\, we will
finally discuss the coupling of electric double la
yers to a nematic texture\, and show the effects o
f salt on
the anchoring strength of a charged w
all.
[1] J.C. Everts\, M.N. van der Linden\, A.
van Blaaderen and R. van Roij\, Soft Matter 12 (2
016) 6610-
6620.
[2] J.C. Everts\, S. Samin
and R. van Roij\, Phys. Rev. Lett. 117 (2016) 0980
02.
[3] J.C. Everts and M. Ravnik\, Sci. Rep. 8
(2018) 14119.
LOCATION:Seminar Room 2\, Newton Institute
CONTACT:INI IT
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