<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div class="" style="font-family: HelveticaNeue; margin: 0px; font-stretch: normal; line-height: normal;"><font face="HelveticaNeue" class="">Dear Soft Matter Colleagues and Friends,</font></div><div class="" style="font-family: HelveticaNeue; margin: 0px; font-stretch: normal; line-height: normal; min-height: 14px;"><font face="HelveticaNeue" class=""><br class=""></font></div><div class="" style="font-family: HelveticaNeue; margin: 0px; font-stretch: normal; line-height: normal;"><font face="HelveticaNeue" class=""><font class="">On Friday 13 January 2023 at 9:30 AM at the UW Faculty of Physics (Pasteura 5, Warsaw;<b class=""> </b></font><b class="">room 1.40</b>) we are hosting a seminar during which</font></div><div class="" style="font-family: HelveticaNeue; margin: 0px; font-stretch: normal; line-height: normal; min-height: 14px;"><font face="HelveticaNeue" class=""><br class=""></font></div><div class="" style="font-family: HelveticaNeue; margin: 0px; font-stretch: normal; line-height: normal;"><font face="HelveticaNeue" class=""><b class="">Jeffrey Everts </b>(University of Warsaw, Faculty of Physics)</font></div><div class="" style="font-family: HelveticaNeue; margin: 0px; font-stretch: normal; line-height: normal; min-height: 14px;"><font face="HelveticaNeue" class=""><br class=""></font></div><div class="" style="font-family: HelveticaNeue; margin: 0px; font-stretch: normal; line-height: normal;"><font face="HelveticaNeue" class="">will give a talk</font></div><div class="" style="font-family: HelveticaNeue; margin: 0px; font-stretch: normal; line-height: normal; min-height: 14px;"><font face="HelveticaNeue" class=""><br class=""></font></div><div class="" style="margin: 0px; font-stretch: normal; line-height: normal;"><div class="" style="margin: 0px; font-stretch: normal; line-height: normal;"><font face="HelveticaNeue" class=""><b class="">Charged complex liquids: the Brazil nut effect and Archimedes’ screws</b></font></div><div class="" style="margin: 0px; font-stretch: normal; line-height: normal;"><font face="HelveticaNeue" class=""><b class=""><br class=""></b></font></div></div><div class="" style="font-family: HelveticaNeue; margin: 0px; font-stretch: normal; line-height: normal;"><b class="">Abstract</b></div><div class="" style="margin: 0px; font-stretch: normal; line-height: normal;"><div class="" style="margin: 0cm; background-color: white;"><div class="" style="margin: 0cm;"><font face="HelveticaNeue" class="">Complex liquids occur in various problems in soft condensed matter, such as colloidal suspensions, liquid crystals, and the cytoplasm of a living cell. In these systems, ions are often present, and they usually play an important role by screening electrostatic interactions or expressing a biological function. In this talk, I will highlight two recent cases where ions in complex liquids lead to unusual phenomena. First, I will show how electrostatics can lead to unusual density sorting in binary mixtures of charged colloids, where heavier particles float on top of the lighter particles. Unlike the granular or active analogue of this system, this colloidal Brazil-nut effect is purely driven by Brownian motion and electrostatics [1]. In the second part of my talk, I will discuss the role of ions in nematic liquid crystals. In our work, we found that ions in liquid crystals can lead to charge separation in the bulk around topological defects [2], surface charge manipulation [3], and anisotropic screening [4]. I will highlight our first efforts to extend such notions to the dynamical case by deriving the Onsager reciprocal coupling between ionic currents and nematic texture [5]. The dynamics are similar to how an Archimedes’ screw works: winding of nematic texture can generate an ionic current, and conversely, ions can push nematic texture, similar to spin pumping and spin torque in spintronics, respectively. Our results suggest that electric currents can facilitate topological defect transport and that defects can carry an inductance, paving the way for using defects as electric circuitry.</font></div><div class="" style="margin: 0cm;"><font face="HelveticaNeue" class=""><br class=""></font></div><div class="" style="margin: 0cm;"><font face="HelveticaNeue" class="">[1] M. N. van der Linden, J. C. Everts, R. van Roij, and A. van Blaaderen, submitted, arXiv:2208.11102 (2022).</font></div><div class="" style="margin: 0cm;"><font face="HelveticaNeue" class="">[2] J. C. Everts and M. Ravnik, Phys. Rev. X 11, 011054 (2021).</font></div><div class="" style="margin: 0cm;"><font face="HelveticaNeue" class="">[3] M. Ravnik and J. C. Everts, Phys. Rev. Lett. 125, 037801 (2020).</font></div><div class="" style="margin: 0cm;"><font face="HelveticaNeue" class="">[4] J. C. Everts, B. Senyuk, H. Mundoor, M. Ravnik and I. I. Smalyukh, Sci. Adv. 7, eabd0662 (2021).</font></div><div class="" style="margin: 0cm;"><font face="HelveticaNeue" class="">[5] C. Dao, J. C. Everts, M. Ravnik, and Y. Tserkovnyak, submitted, arXiv:2210.17116 (2022).</font></div><div class="" style="margin: 0cm;"><font face="HelveticaNeue" class=""><br class=""></font></div></div></div><div class="" style="font-family: HelveticaNeue; margin: 0px; font-stretch: normal; line-height: normal;">We warmly welcome everyone to attend the talk and the Soft Matter Coffee Break after the seminar, held in room 2.63 (2nd floor).</div><div class="" style="font-family: HelveticaNeue;"><br class=""></div><div class="" style="font-family: HelveticaNeue;"><font face="HelveticaNeue" class=""><div class="" style="margin: 0px; font-stretch: normal; line-height: normal;"><font face="HelveticaNeue" class="">Maria Ekiel-Jeżewska</font></div><div class="" style="margin: 0px; font-stretch: normal; line-height: normal;"><font face="HelveticaNeue" class="">Maciej Lisicki</font></div><div class="" style="margin: 0px; font-stretch: normal; line-height: normal;"><font face="HelveticaNeue" class="">Piotr Szymczak</font></div><div class="" style="margin: 0px; font-stretch: normal; line-height: normal;"><font face="HelveticaNeue" class="">Panagiotis Theodorakis </font></div></font></div><div class="">
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