From Maciej.Lisicki at fuw.edu.pl Mon Jan 6 11:06:51 2025 From: Maciej.Lisicki at fuw.edu.pl (Maciej Lisicki) Date: Mon, 6 Jan 2025 11:06:51 +0100 Subject: [Soft-matter] Soft Matter & Complex Systems Seminar on 10 Jan 2025 Message-ID: <369384EE-93B6-4CB5-913B-151D30E15963@fuw.edu.pl> Dear Soft Matter & Complex Systems Colleagues and Friends, Happy New Year to all! On Friday 10 January 2025 at 9:30 AM at the UW Faculty of Physics (Pasteura 5, Warsaw; room 1.40) we are hosting a seminar during which Tetuko Kurniawan (IPPT PAN) will give a talk Formation of Droplets in Microfluidic Cross-Junctions and Their Application as Cell Incubators Abstract Droplet microfluidics is an innovative technique in biomedical research that leverages the creation of small, isolated compartments formed by immiscible fluids, typically a water-in-oil system, within a network of microscale channels on a chip. In this talk, I will explore droplet formation in the very low capillary number regime. Interestingly, droplet formation in this regime diverges from the well-known squeezing mechanism, as evidenced by a significant increase in droplet size and neck length before pinch-off with respect to the capillary number. A generalized scaling law was developed to predict droplet volume in microfluidic cross-junctions and was validated using experimental data from devices with varying cross-sectional geometries. These findings deepen our understanding of droplet formation mechanics in the very low capillary number range. Additionally, I will discuss the practical applications of droplet microfluidics as micro-sized incubators for cell culture. Effective strategies for reducing the loading time of cell-containing media and minimizing droplet liquid mass transport through the permeable PDMS material will be presented, resulting in the ability to sustain the viability of most cells for over 24 hours. 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 Jan 13 16:12:10 2025 From: Maciej.Lisicki at fuw.edu.pl (Maciej Lisicki) Date: Mon, 13 Jan 2025 16:12:10 +0100 Subject: [Soft-matter] Soft Matter & Complex Systems Seminar on 17 Jan 2025 Message-ID: Dear Soft Matter & Complex Systems Colleagues and Friends, On Friday 17 January 2025 at 9:30 AM at the UW Faculty of Physics (Pasteura 5, Warsaw; room 1.40) we are hosting a seminar during which Tomasz Bobi?ski (MEiL PW) will give a talk Cloaking defects in a water waveguide system Abstract Controlling surface water wave propagation is crucial for wave manipulation and cloaking technologies. By leveraging the invariance of shallow water equations under coordinate transformations, objects can be rendered invisible to incident waves. Traditional transformations often require spatially anisotropic bathymetries, which typically violate the assumptions of the depth-averaged models describing the propagation of water waves. We demonstrate that conformal mapping, which provides smoothly varying bathymetry, can be effectively applied to water waveguide systems with defects in the form of local variations in the waveguide wall shape. Our approach successfully cloaks these defects across a broad range of frequencies, including regimes where dispersive effects are significant. Despite the inherent dispersive nature of water waves, forward scattering remains weak, ensuring robust cloaking performance. Experimental results validate the broadband capabilities of this method. Based on the results obtained in the case of the meandering waveguide, we present a novel technique to render objects invisible to incident waves in a water waveguide system with parallel walls at low frequencies. The invisibility of a waveguide defect, specifically a vertical surface-piercing circular cylinder, is achieved through local deformations of the waveguide walls in the immediate vicinity of the defect. Our method results in a reflection coefficient that is at least 20 times lower than in the case of a parallel waveguide. The effect is observed over a broad frequency range. Experimental results confirm the high efficiency of our approach, showing that backscattered energy is reduced by a factor of 100 to 5000 compared to the reference case within the considered frequency range. 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 Jan 20 22:42:27 2025 From: Maciej.Lisicki at fuw.edu.pl (Maciej Lisicki) Date: Mon, 20 Jan 2025 22:42:27 +0100 Subject: [Soft-matter] Soft Matter and Complex Systems Seminar: student talks on 24 Jan and 28 Feb Message-ID: <8B7EE5A7-920E-4AA5-BF55-941F498FC9E2@fuw.edu.pl> On Friday 24 January 2024 at 9:30 AM at the UW Faculty of Physics (Pasteura 5, Warsaw; room 1.40) we are hosting a series of student talks: Magdalena Lata?a Phantom traffic jams Gabriela Niechwiadowicz Visualisation of singularities of Stokes equation Jan Gers Searching for nonlocal behavior in quantum Ising chain Ryszard Kobiera Stress-induced DNA duplex destabilization We will continue with student talks at the first seminar of the new term, on 28 February, when we will hear seminars from: Franciszek Myck Formation of bacterial aggregates in shear flow Magdalena Kopczy?ska Photoluminescence of CrPS? and its dependence on the magnetic field parallel to the flake plane Victoria Vasileuskaya Topological phase transition, from cyclic to tree structures in evolving transport networks 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: