From Maciej.Lisicki at fuw.edu.pl Mon Jun 2 16:05:40 2025 From: Maciej.Lisicki at fuw.edu.pl (Maciej Lisicki) Date: Mon, 2 Jun 2025 16:05:40 +0200 Subject: [Soft-matter] Soft Matter & Complex Systems Seminar on 6 June 2025 Message-ID: Dear Soft Matter & Complex Systems Colleagues and Friends, On Friday 6 June 2025 at 9:30 AM at the UW Faculty of Physics (Pasteura 5, Warsaw; room 1.40) we are hosting a seminar during which Magdalena Mrokowska (IGF PAN, Warsaw) will give a talk Experimental insights into the sinking dynamics of solid particles in stratified aquatic systems Abstract The settling of individual particles at low to moderate Reynolds numbers is a key mechanism for transporting particulate matter in oceans, seas, and lakes, which are often stratified by salinity- and temperature-driven density gradients. In such environments, particles exhibit complex behaviors, including transient dynamics and orientation instabilities. Density interfaces can also act as accumulation zones for biopolymers secreted by algae and bacteria, locally introducing non-Newtonian properties to the water column that further influence particle motion through viscoelastic and shear-dependent effects. These processes, though elusive in nature, are critical to understanding nutrient and carbon fluxes, microbial ecology, and pollutant transport. To explore stratification effects, this presentation will demonstrate experimental results on disk settling through a two-layer water column with a non-linear density transition. The goal was to assess how stratification and disk shape influence settling velocity, reorientation behavior, and hydrodynamic interactions with wake. Flow visualization revealed five settling phases, marked by sequential reorientations and local velocity minima. Unique wake structures, including a bell-shaped one, were observed. Further experiments introduced model biopolymers to examine the combined impact of density and rheological gradients on the sinking of particles with various shapes. Results revealed that rheological gradients can play a dominant role in governing particle behavior. Overall, the findings raise further questions regarding the interplay of particle shape, stratification properties, and complex fluid rheology in sedimentation processes. 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 -------------- next part -------------- An HTML attachment was scrubbed... URL: From Maciej.Lisicki at fuw.edu.pl Mon Jun 9 09:12:04 2025 From: Maciej.Lisicki at fuw.edu.pl (Maciej Lisicki) Date: Mon, 9 Jun 2025 09:12:04 +0200 Subject: [Soft-matter] Soft Matter & Complex Systems Seminar on 13 June 2025 Message-ID: <26206431-0507-4E53-95DF-B055578928D4@fuw.edu.pl> Dear Soft Matter & Complex Systems Colleagues and Friends, On Friday 13 June 2025 at 9:30 AM at the UW Faculty of Physics (Pasteura 5, Warsaw; room 1.40) we are hosting the final seminar of the summer term, during which Svyatoslav Kondrat (IChF PAN, Warsaw) will give a talk Low-dimensional Ionotronics: How Classical Models Reveal New Insights Abstract Low-dimensional ionotronic systems exhibit captivating physics and find a range of technological applications, from capacitive energy storage and conversion to desalination and electroactuation. Despite their promise, these systems present significant challenges for investigation due to their inherent complexity and computational limitations [1]. In this talk, we will explore the application of analytically solvable statistical physics models to the study of nanostructured ionotronic systems. I will present insights from both lattice [2,3] and off-lattice [4] models, emphasizing their differences and relevance to phenomena such as ion ordering [5], quantum capacitance effects [6], and strategies for optimizing the performance of ionotronic-based devices [7,8,9]. I will particularly highlight results that are challenging to achieve with widely used molecular simulations, showcasing the unique utility and power of analytically solvable models. Acknowledgements This work was supported by the Polish National Science Centre (NCN) under grants Nos. 2021/40/Q/ST4/00160 and 2020/39/I/ST3/02199. References [1] Kondrat, Feng, Bresme, Urbach, and Kornyshev, Chem. Rev. 123, 6668 (2023) [2] Kornyshev, Faraday. Disc. 164, 117-133 (2013) [3] Lee, Kondrat, and Kornyshev, Phys Rev Lett. 113, 048701 (214) [4] Verkholyak, Kuzmak, and Kondrat, J. Chem. Phys. 155, 174112 (2021) [5] Groda, Dudka, Kornyshev, Oshanin, and Kondrat, J. Phys. Chem C. 125, 4968 (2021) [6] Verkholyak, Kuzmak, Kornyshev, and Kondrat, J. Chem. Phys. Lett. 13, 10976 (2023) [7] Janssen, Verkholyak, Kuzmak, Kondrat, J. Mol Liq. 371, 121093 (2023). [8] Seltmann, Verkholyak, Go?owicz, Pamet?, Kuzmak, Presser, and Kondrat, J. Mol. Liq. 391, 123369 (2023). [9] Paolini, Antony, Raju, Kuzmak, Verkholyak, Kondrat, ChemElectroChem, e202400218 (2024). 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 -------------- next part -------------- An HTML attachment was scrubbed... URL: