From Maciej.Lisicki at fuw.edu.pl Wed Dec 4 19:25:13 2024 From: Maciej.Lisicki at fuw.edu.pl (Maciej Lisicki) Date: Wed, 4 Dec 2024 19:25:13 +0100 Subject: [Soft-matter] Theoretical Physics Symposium on 5-6 Dec 2024 Message-ID: <26D8573B-AE5B-4B50-9A1F-C797B7F210EA@fuw.edu.pl> Dear Soft Matter & Complex Systems Colleagues and Friends, The coming Friday, 6 December, there will be no seminar. Instead, we invite you to attend the Theoretical Physics Symposium, held at FUW on 5 and 6 December. The detailed programme of the Symposium can be found here: https://theory-symposium2024.fuw.edu.pl/ Maria Ekiel-Je?ewska Maciej Lisicki Piotr Szymczak Panagiotis Theodorakis Marek Trippenbach -------------- next part -------------- An HTML attachment was scrubbed... URL: From Maciej.Lisicki at fuw.edu.pl Tue Dec 10 10:44:28 2024 From: Maciej.Lisicki at fuw.edu.pl (Maciej Lisicki) Date: Tue, 10 Dec 2024 10:44:28 +0100 Subject: [Soft-matter] No seminar on 13 Dec Message-ID: <9CB20286-D068-4876-8B3D-5303757B9055@fuw.edu.pl> Dear Soft Matter & Complex Systems Colleagues and Friends, Due to the speaker?s illness, the seminar on Friday 13 December 2024 is cancelled and will be held at a later date. The last seminar of this calendar year will be held on 20 December. Maria Ekiel-Je?ewska Maciej Lisicki Piotr Szymczak Panagiotis Theodorakis Marek Trippenbach -------------- next part -------------- An HTML attachment was scrubbed... URL: From Maciej.Lisicki at fuw.edu.pl Tue Dec 10 21:37:51 2024 From: Maciej.Lisicki at fuw.edu.pl (Maciej Lisicki) Date: Tue, 10 Dec 2024 21:37:51 +0100 Subject: [Soft-matter] (UPDATE) Soft Matter & Complex Systems Seminar on 13 Dec 2024 Message-ID: <444CF5A8-71DE-4C87-8187-79A55A4D2E01@fuw.edu.pl> Dear Soft Matter & Complex Systems Colleagues and Friends, In a fortunate turn of events, we have secured a new speaker for the seminar. On Friday 13 December 2024 at 9:30 AM at the UW Faculty of Physics (Pasteura 5, Warsaw; room 1.40) we are hosting a seminar during which Reinier van Buel (FUW) will give a talk Active and passive control of elastic turbulence at low Reynolds numbers Abstract Elastic turbulence, a chaotic flow state occurring in viscoelastic fluids at negligible Reynolds numbers, enhances fluid mixing on small scales, making it valuable for applications like lab-on-a-chip devices. Here, we show the influence of active and passive control on elastic turbulence using numerical simulations of the Oldroyd-B model in OpenFOAM?. In a two-dimensional Taylor-Couette geometry, the onset of elastic turbulence is characterised by a critical Weissenberg number, marking a transition from laminar to turbulent flow. Flow resistance and secondary-flow strength, serving as order parameters, increase with turbulence, correlating strongly with enhanced fluid mixing. Power-law scaling of velocity fluctuations aligns with experimental results, confirming the turbulent nature of the flow. Active control, implemented through imposed shear-rate modulations, shows promise for managing turbulence. Slow modulations induce complex behaviours, while fast modulations suppress turbulence. The state diagram of Weissenberg and Deborah numbers highlights the transition to turbulence and suggests an effective critical Weissenberg number to approximate the transition line. In three-dimensional von K?rm?n flow, elastic turbulence exhibits a subcritical transition, marked by bistable behaviour and hysteresis. Flow resistance and order parameters increase significantly, confirming turbulence. Active control applied here reduces turbulence and relaminarises the flow, mirroring results from the Taylor-Couette system. These findings underscore the potential of controlling elastic turbulence to optimise fluid mixing and stability in viscoelastic systems. We warmly welcome everyone to attend the talk and the Soft Matter Coffee Break after the seminar, held in room 2.63 (2nd floor). Maria Ekiel-Je?ewska Maciej Lisicki Piotr Szymczak Panagiotis Theodorakis Marek Trippenbach -------------- next part -------------- An HTML attachment was scrubbed... URL: From Maciej.Lisicki at fuw.edu.pl Mon Dec 16 16:40:22 2024 From: Maciej.Lisicki at fuw.edu.pl (Maciej Lisicki) Date: Mon, 16 Dec 2024 16:40:22 +0100 Subject: [Soft-matter] Soft Matter & Complex Systems Seminar on 20 Dec 2024 Message-ID: <9C912D92-457A-43EA-9E40-80B0E946D13C@fuw.edu.pl> Dear Soft Matter & Complex Systems Colleagues and Friends, On Friday 20 December 2024 at 9:30 AM at the UW Faculty of Physics (Pasteura 5, Warsaw; room 1.40) we are hosting a seminar during which Dimitrius Khaladj (Lawrence Berkeley National Lab, USA) will give a talk Electrochemical lithium separation from natural brines using non-equilibrium graphene-oxide liquid crystal Abstract Conventional methods for lithium extraction via evaporation pools or hard rock mining are environmentally consequential both locally and globally. To meet the demand for mineral components for lithium batteries while lessening the environmental impact, new technologies for 'direct' lithium extraction aim to selectively capture lithium from aqueous solution among a m?lange of competing ionic species. In this work, we present a new concept for direct lithium extraction based on far-from-equilibrium transport of lithium through self-assembled percolating colloidal graphene oxide (GO) driven by AC Electric fields. We report that these self-assembled GO networks enhance ionic conductivity, actively transporting and selecting lithium without requiring extensive pre-treatment. We demonstrate that lithium transport far-from-equilibrium can be enhanced relative to competing cations due to its weaker specific interactions with the percolating GO network, resulting in high mobility. This runs counter to many conventional approaches to lithium extraction, which rely on high lithium selectivity but are implicitly limited by low binding/exchange turnover rates. We propose that enhancing lithium transport, rather than binding selectivity, may be key to high-rate direct lithium extraction from brine sources. We warmly welcome everyone to attend the talk and the Soft Matter Coffee Break after the seminar, held in room 2.63 (2nd floor). Maria Ekiel-Je?ewska Maciej Lisicki Piotr Szymczak Panagiotis Theodorakis Marek Trippenbach -------------- next part -------------- An HTML attachment was scrubbed... URL: