<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;"><span class="">Dear Soft Matter Colleagues and Friends,</span></div><div class="" style="font-family: HelveticaNeue;"><span class=""><br class=""></span></div><div class=""><div class="" style="font-family: HelveticaNeue;">On Friday 14 April 2023 at 9:30 AM at the UW Faculty of Physics (Pasteura 5, Warsaw; room 1.40) we are hosting a seminar during which we will hear 3 talks:</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="">Russell Kajouri </b>(IF PAN)</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 class="" style="margin: 0px; font-stretch: normal; line-height: normal;"><font face="HelveticaNeue" class=""><b class=""><span class="Apple-tab-span" style="white-space:pre"> </span>Unidirectional Droplet Propulsion onto Gradient Brushes Without External Energy Supply</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 class="" style="margin: 0px; font-stretch: normal; line-height: normal;"><font face="HelveticaNeue" class="">Durotaxis motion due to stiffness gradient is a process in which an agent, e.g.. a droplet or a cell, exhibits a unidirectional movement without consuming the energy of an external source. In our recent research, we describe the possibility of durotaxis motion of polymer-brush substrates and its dependence on various parameters. We also explain the mechanism of this phenomenon.</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 class="" style="margin: 0px; font-stretch: normal; line-height: normal;"><font face="HelveticaNeue" class=""><b class="">Soheil Arbab</b>i (IF PAN)</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 class="" style="margin: 0px; font-stretch: normal; line-height: normal;"><font face="HelveticaNeue" class=""><b class=""><span class="Apple-tab-span" style="white-space:pre"> </span>Coalescence of surfactant-laden droplets</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 class="" style="margin: 0px; font-stretch: normal; line-height: normal;"><font face="HelveticaNeue" class="">Droplet coalescence is commonly encountered in nature and is also relevant for various technologies, such as inkjet printing. In this presentation, we present our results on the coalescence ofsurfactant-laden water droplets, which have been obtained by means of molecular dynamics simulation of a coarse-grained (CG) force-field. In particular, we will discuss the details of thecoalescence mechanism and the bridge growth dynamics.</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 class="" style="margin: 0px; font-stretch: normal; line-height: normal;"><font face="HelveticaNeue" class=""><b class="">Luis Carnevale </b>(IF PAN)</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 class="" style="margin: 0px; font-stretch: normal; line-height: normal;"><font face="HelveticaNeue" class=""><b class=""><span class="Apple-tab-span" style="white-space:pre"> </span>Liquid thread breakup and the formation of satellite droplets</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 class="" style="margin: 0px; font-stretch: normal; line-height: normal;"><font face="HelveticaNeue" class="">The breakup of liquid threads into smaller droplets is a fundamental problem in fluid dynamics. Here, we estimate the characteristic wavelength of the breakup process by means of many-body dissipative particle dynamics and discuss the power-law dependence of the number of satellite droplets as a function of the Ohnesorge and thermal capillary number. We also elucidate the breakup mechanism and the conditions under satellite droplets form.</font></div><div style="font-family: HelveticaNeue;" class=""><br class=""></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><div class="" style="font-family: HelveticaNeue;"><br class=""></div><div class="" style="font-family: HelveticaNeue;"><div dir="auto" class="" style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;"><div 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><div class="" style="margin: 0px; font-stretch: normal; line-height: normal;"><font face="HelveticaNeue" class="">Marek Trippenbach</font></div></div></div></div>
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