<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 & Complex Systems 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 2 June 2023 at 9:30 AM at the UW Faculty of Physics (Pasteura 5, Warsaw; room 1.40) we are hosting a series of student talks:</div><div class="" style="font-family: HelveticaNeue;"><br class=""></div><div class="" style="font-family: HelveticaNeue; margin: 0px; font-stretch: normal; line-height: normal; min-height: 14px;"><font face="HelveticaNeue" class=""><b class="">Małgorzata Przerwa</b> (FUW)</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="">Sedimentation of mass-asymmetric dumbbells in Stokes flow.</b></font></div><div class="" style="margin: 0px; font-stretch: normal; line-height: normal;"><font face="HelveticaNeue" class=""><br class=""></font></div><div class="" style="margin: 0px; font-stretch: normal; line-height: normal;"><font face="HelveticaNeue" class="">We investigate the dynamics of a mass-asymmetric dumbbells sedimentation in a low Reynolds number regime, in a pseudo-2D environment. We numerically and analytically predict the motion, and compare the trajectories to experimental data.</font></div><div class="" style="margin: 0px; font-stretch: normal; line-height: normal;"><font face="HelveticaNeue" class=""><br class=""></font></div><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;"><b style="font-family: HelveticaNeue;" class="">Anti-durotaxis motion onto Gradient Brushes Without External Energy Supply</b></div><div class="" style="margin: 0px; font-stretch: normal; line-height: normal;"><font face="HelveticaNeue" class=""> </font></div><div class="" style="margin: 0px; font-stretch: normal; line-height: normal;"><font face="HelveticaNeue" class="">Durotaxis motion usually takes place from softer to stiffer parts of a substrate with stiffness gradient, as has been demonstrated in the case of cell motion on cancer tissues in the context of biology, or more recently for droplets on gradient brush substrates (<a href="https://doi.org/10.1021/acs.langmuir.2c03381" class="">https://doi.org/10.1021/acs.langmuir.2c03381</a>). In this presentation, we will demonstrate a new brush substrate design with stiffness gradient, which is able to sustain anti-dutoraxis motion, that is cause the motion of a fluid from its stiffer to its softer parts of the brush substrate. For this case, we will present the influence of the various, key system parameters and the underlying mechanism of the fluid motion.</font></div><div class="" style="margin: 0px; font-stretch: normal; line-height: normal;"><font face="HelveticaNeue" class=""> </font></div><div class="" style="margin: 0px; font-stretch: normal; line-height: normal;"><font face="HelveticaNeue" class=""><b class="">Soheil Arbabi</b> (IF PAN)</font></div><div class="" style="margin: 0px; font-stretch: normal; line-height: normal;"><font face="HelveticaNeue" class=""><b class="">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=""> </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><div class="" style="font-family: HelveticaNeue; margin: 0px; font-stretch: normal; line-height: normal;"><div class="" style="margin: 0cm; background-color: white;"><div class="" style="margin: 0px; font-stretch: normal; line-height: normal;"><br class=""></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><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><div class="">
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