BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:Medium- and particle-shape effects on electric double layers - Jef
 frey Everts (University of Ljubljana  )
DTSTART:20190424T140000Z
DTEND:20190424T160000Z
UID:TALK123691@talks.cam.ac.uk
CONTACT:INI IT
DESCRIPTION:Charged surfaces in contact with liquids containing ions are a
 ccompanied in equilibrium by an<br>electric double layer consisting of a l
 ayer of electric charge on the surface that is screened by a diffuse ion<b
 r>cloud in the bulk fluid. This screening cloud determines not only the in
 teractions between charged<br>colloidal particles or poly- electrolytes an
 d their self-assembly into ordered structures [1]\, but also on how<br>the
  interaction of a charged colloidal particle with an oil-water interface c
 an be tuned from attractive to<br>repulsive by varying the salt concentrat
 ion\, as we will discuss in this talk [2]. In the second part of this<br>t
 alk we will discuss to what spatial complexity the electric double layers 
 can be designed. We show that<br>electric double layers of non-trivial top
 ology -including tori\, multi-tori and knots- can be realised in<br>charge
 d colloids with complex-shaped particles\, using numerical modelling. We s
 how that the topology<br>of double layers can be defined via a cut-off in 
 the ion concentration without any loss of generality\, and<br>demonstrate 
 that the double layer topology can be tuned by changing the Debye screenin
 g length of the<br>medium\, or by changing the shape and topology of the (
 colloidal) particle [3]. If time permits\, we will<br>finally discuss the 
 coupling of electric double layers to a nematic texture\, and show the eff
 ects of salt on<br>the anchoring strength of a charged wall.<br>[1] J.C. E
 verts\, M.N. van der Linden\, A. van Blaaderen and R. van Roij\, Soft Matt
 er 12 (2016) 6610-<br>6620.<br>[2] J.C. Everts\, S. Samin and R. van Roij\
 , Phys. Rev. Lett. 117 (2016) 098002.<br>[3] J.C. Everts and M. Ravnik\, S
 ci. Rep. 8 (2018) 14119.<br>
LOCATION:Seminar Room 2\, Newton Institute
END:VEVENT
END:VCALENDAR