We have computed the corresponding drag force on a particle and find that it is much lower than the one predicted by the Navier-Stokes equation. Weian Sheng Airbnb, Intel, University of Florida Verified email at airbnb.com. References (Subscription Required) Click to Expand. With this in mind, we investigated the impact that surfactants have on this mechanism and found that parts of the gas-water interface become ‘solidified’ by surfactant pile-up. Link: https://doi.org/10.1017/jfm.2019.921. Now imaging shrinking the diameter of the wine glass to one millimeter. Seyed Mahmood Mousavi High Performance Computing center (HPCC) Потвърден имейл адрес: shirazu.ac.ir. We have studied this phenomenon based on experiments and theory. Microfluid Nanofluid 24, 41 (2020). References (Subscription Required) Click to Expand. Duval CNRS Research Director - LIEC Laboratory (Nancy, France) Verified email at univ-lorraine.fr. DNA molecules can be concentrated by electrophoretic accumulation at an interface between two immiscible polymer solutions. Apart from its relevance in applications, this process goes along with the formation of characteristic DNA concentration patterns, visible in the figure at the left. The transition from the Cassie state to these intermediate states is partially reversible. Fachgebiet Nano- und Mikrofluidik – Herzlich willkommen am Fachgebiet Nano- und Mikrofluidik. S. Dehe, B. Rofman, M. Bercovici, and S. Hardt, Electro-osmotic flow enhancement over superhydrophobic surfaces, Physical Review Fluids 5 (2020), 053701. B. Rofman, S. Dehe, V. Frumkin, S. Hardt, and M. Bercovici, Intermediate states of wetting on hierarchical superhydrophobic surfaces, Langmuir 36 (2020), 5517−5523. Следене. In: Physics of Fluids, (2), 32. Philippe Davy directeur de recherche, CNRS, Rennes Verified email at univ-rennes1.fr. S. 025108, ISSN 1070-6631, DOI: 10.1063/1.5141165, [Online-Edition: https://doi.org/10.1063/1.5141165], [Artikel] We have studied the transport of gas mixtures along a Knudsen pump and observed differences in flow of the individual components of the mixture. DNA molecules can be concentrated by electrophoretic accumulation at an interface between two immiscible polymer solutions. ‘Super-hydrophobic’ surfaces with embedded gas pockets have been suggested for reducing drag on objects moving through water. In that case, the viscosity coefficients represent the dissipation due to the presence of particles or surfactants in an average manner. ‘Super-hydrophobic’ surfaces with embedded gas pockets have been suggested for reducing drag on objects moving through water. Therefore, such a pump may be used for gas separation. Unsere Forschung erstreckt sich über ein breites Themenspektrum und kombiniert experimentelle, theoretische und numerische Ansätze. Click here for details, Species transfer using small droplets as carriers. Hover over the donut graph to view the FC output for each subject. https://doi.org/10.1007/s10404-020-02342-6. Year; Temperature dependence of antiferromagnetic order in the Hubbard model. Sort by citations Sort by year Sort by title. Working area(s) Emeritus. Our research extends over a broad thematic spectrum and combines experimental, theoretical and numerical approaches. References (Subscription Required) Click to Expand. hampe@tvt.tu-... work +49 6151 16-22520. These results could significantly simplify simulations of two-phase flows with particle-laden interfaces. Reuse & Permissions . We have studied this phenomenon based on experiments and theory. A: Alarich-Weiss-Straße 10, L2|06 111, 64287 Darmstadt, GER T: +49 6151 16-24276. T. Baier and S. Hardt, Influence of insoluble surfactants on shear flow over a surface in Cassie state at large Péclet numbers, Journal of Fluid Mechanics 907 (2020), A3. ‡ hardt@nmf.tu-darmstadt.de; Article Text (Subscription Required) Click to Expand. We are concerned with transport phenomena in fluids on the nano- and micrometer scale. We have found a solution to this problem, where a droplet with a diameter of the order of 5 µm serves as carrier for the cargo. Together with cooperation partners from the Technion/Israel, we have studied the wetting states of hierarchical superhydrophobic surfaces, consisting of an array of micropillars that is decorated with nanoparticles. Together with cooperation partners from the Technion/Israel, we have studied the electroosmotic flow along superhydrophobic surfaces, augmented by gate electrodes. L2|06 113. Formation of small droplets inside larger droplets, Microfluidic chip with two-phase flow for DNA or protein separation in an electric field, Wetting transition on a superhydrophobic surface, Electroosmotic flow along a superhydrophobic surface induced by a gate electrode. We have recently derived analytical expressions for the viscosity coefficients of a particle-laden fluid interface in the limit of low particle concentrations. Intermediate wetting states on superhydrophobic surfaces. DOI:10.1017/jfm.2019.921. Nanoscale gas kinetics, electrokinetics, interfacial flows, wetting phenomena and biomolecular separation belong to our areas of work. We have theoretically studied the EOF induced by SAWs and found that in small-scale channels, the EOF velocity may significantly exceed the velocity due to the acoustic field. We investigate the impact of insoluble surfactants on shear flow along a superhydrophobic surface in Cassie state, with gas trapped in grooves oriented perpendicular to the flow direction. Institute for Nano- and Microfluidics. Principal institution: Darmstadt University of Technology (TU Darmstadt) Region: Global Subject/journal group: All The table to the right includes counts of all research outputs for Institute for Nano- and Microfluidics (NMF), TU Darmstadt published between 1 June 2019 - 31 May 2020 which are tracked by the Nature Index. Reference: P. Goswami, T. Baier, S. Tiwari, C. Lv, S. Hardt, and A. Klar, Drag force on spherical particle moving near a plane wall in highly rarefied gas. Microfluid Nanofluid 24, 41 (2020). T Baier, E Bick, C Wetterich. The droplet reciprocates between two aqueous reservoirs under the influence of a DC electric field. Knudsen pumps rely on gas-flows induced by temperature differences. Electronic address: stark@pos.tu-darmstadt.de. With this in mind, we investigated the impact that surfactants have on this mechanism and found that parts of the gas-water interface become ‘solidified’ by surfactant pile-up. Unsere Forschung erstreckt sich über ein breites Themenspektrum und kombiniert experimentelle, theoretische und numerische Ansätze. Electroosmotic flow (EOF) induced by surface acoustic waves. Transferring chemical species or nanoparticles in a controlled way becomes challenging when very small species amounts are considered. Therefore, SAW-induced EOF may be useful as a method for pumping liquids through small scale channels. Issue. 5, Iss. DOI: 10.1017/jfm.2020.80, Pattern formation in layers of DNA molecules. Steffen Hardt. Steffen Hardt Professor, TU Darmstadt Verified email at nmf.tu-darmstadt.de. Via the charges created at the gas-liquid interfaces, the flow velocity can be increased by more than a factor of 10 compared to unstructured surfaces. If, however, small particles or surfactants are adsorbed to a gas-liquid or liquid-liquid interface, the interface itself becomes viscous. Song Jinlong The School of Mechanical Engineering, Dalian University of Technology Verified email at dlut.edu.cn. Administrative Staff Corinna Neumann. Hirofumi Shintaku RIKEN Hakubi Team Leader Verified email at me.kyoto-u.ac.jp. Clarendon Press. Tobias Baier Center of Smart Interfaces, TU Darmstadt Потвърден имейл адрес: nmf.tu-darmstadt.de. A summary of the main results can be found here. Zu unseren Arbeitsgebieten gehören Gaskinetik auf der Nanoskala, Elektrokinetik, Grenzflächenströmungen, Benetzungsphänomene und Trennprozesse für Biomoleküle. 5 — May 2020. Surfactants can immobilize fluid–liquid interfaces under shear stress. Transferring chemical species or nanoparticles in a controlled way becomes challenging when very small species amounts are considered. SAWs are acoustic waves travelling along the interface between a solid and a fluid. For a small particle inside a gas, the fluid dynamics of such problems becomes very involved, since the Navier-Stokes equation is no longer applicable. References. Sitemap Enhancement of electroosmotic flow on superhydrophobic surfaces. M. Dietzel and S. Hardt, Electroosmotic flow in small-scale channels induced by surface-acoustic waves, Physical Review Fluids 5 (2020), 123702. Reference: M. Shojaeian and S. Hardt, Mass transfer via femtoliter droplets in ping-pong mode, Physical Review Applied 13 (2020), 014015. Reuse & Permissions. A summary of the main results can be found here. Latest supplement. Together with cooperation partners from the Technion/Israel, we have studied the wetting states of hierarchical superhydrophobic surfaces, consisting of an array of micropillars that is decorated with nanoparticles. “Tears of wine” is a phenomenon that can be observed in wine glasses: Driven by Marangoni stresses, a liquid film crawls up along the glass wall. This kind of separation of gas species by mass or size plays an important role for many applications in chemical engineering. Tobias Baier Center of Smart Interfaces, TU Darmstadt Verified email at nmf.tu-darmstadt.de. We have studied the transfer of chemical species between the two reservoirs mediated by the droplet. Supplemental Material (Subscription Required) Click to Expand. Upon touching the reservoir, the droplet reverses its charge and its direction of motion. pp. These liquid rings finally collapse and form plugs that are propelled along the capillary tube by evaporation. Research; Relationships; 1 August 2019 - 31 July 2020. Mikrosystemtechnik Kongress 2011, Darmstadt, Germany, [Conference or Workshop Item] Hahn, T. (2011): Interfacial electrokinetic transport phenomena and their impact on DNA electrophoresis in microfluidics. If, however, small particles or surfactants are adsorbed to a gas-liquid or liquid-liquid interface, the interface itself becomes viscous. Hide All. Reference: C. Lv, S. N. Varanakkottu, and S. Hardt, Liquid plug formation from heated binary mixtures in capillary tubes, Journal of Fluid Mechanics 889 (2020), A15. Nature Index 2020 Artificial Intelligence. Welcome to the Institute for Nano- und Microfluidics. We find a multitude of intermediate states between the classical Cassie and Wenzel states. SIAM J. Numer. At a microscopic scale, surfactants, molecules attached to the interface between two fluids, can suffer the same fate, immobilizing the interface upstream of an obstacle. You are here: TU Darmstadt; Maschinenbau; Nano- and Microfluidics; Home; Institute for Nano- and Microfluidics. hardt@nmf.tu-... +49 6151 16-24274. Tobias Baier Center of Smart Interfaces, TU Darmstadt Verified email at nmf.tu-darmstadt.de. Up to now, the electrokinetic effects due to SAWs have remained largely unexplored. Click here for details, Species transfer using small droplets as carriers. The method is sketched in the schematic on the left. Klingenberg, Dario ; Oberlack, Martin ; Pluemacher, Dominik (2020): Symmetries and turbulence modeling. Now imaging shrinking the diameter of the wine glass to one millimeter. For a small particle inside a gas, the fluid dynamics of such problems becomes very involved, since the Navier-Stokes equation is no longer applicable. Articles Cited by Co-authors. Institute of Printing Science and Technology, TU Darmstadt did not contribute to any primary research papers from Nature Index journals in the current 12 month window. Electronic address: hardt@nmf.tu-darmstadt.de. Physical Review B 70 (12), 125111, 2004. christophe clanet CNRS, LadHyX, Ecole … The table to the right includes counts of all research outputs for Technical University of Darmstadt (TU Darmstadt) published between 1 September 2019 - 31 August 2020 which are tracked by the Nature Index. Apart from its relevance in applications, this process goes along with the formation of characteristic DNA concentration patterns, visible in the figure at the left. Electronic address: kleebe@geo.tu-darmstadt.de. Contact. Verified email at nmf.tu-darmstadt.de. In that case, ring-like structures are formed from the film. Institute of Applied Geosciences (IAG), TU Darmstadt . Flow and streaming potential of an electrolyte in a channel with an axial temperature gradient - Volume 813 - Mathias Dietzel, Steffen Hardt A sphere moving in the vicinity of a wall experiences an increased fluid-dynamic drag force compared to motion far from solid boundaries, influencing the adsorption of particles at surfaces. 1994 Molecular Gas Dynamics and the Direct Simulation of Gas Flows. Stability and collapse of holes in liquid layers - Volume 855 - Cunjing Lv, Michael Eigenbrod, Steffen Hardt Head of Institute. DOI: 10.1103/PhysRevApplied.13.014015. Download file × Formation of small droplets inside larger droplets, Microfluidic chip with two-phase flow for DNA or protein separation in an electric field, Wetting transition on a superhydrophobic surface, Electroosmotic flow along a superhydrophobic surface induced by a gate electrode. fluid dynamics microfluidics electrokinetics. Intermediate wetting states on superhydrophobic surfaces. DOI: 10.1103/PhysRevLett.124.064501, Tutorium „CFD-based simulation and optimization of microfluidic components“, This tutorium will equip students with the basic methodology needed to design and optimize microfluidic components on the computer. Markus Biesalski Professor für Makromolekulare Chemie und Papierchemie, Technische Universität Darmstadt Verified email at cellulose.tu-darmstadt.de. Please find below older news relating to research at the Institute for Nano- and Microfluidics. Cited by. As a stream encounters an obstacle, floating debris sometimes piles up in front of the obstacle, forming a dense layer on the water surface. In that case, ring-like structures are formed from the film. T. Baier and S. Hardt, Influence of insoluble surfactants on shear flow over a surface in Cassie state at large Péclet numbers, Journal of Fluid Mechanics 907 (2020), A3. BHANUMAN BARMAN Assistant Professor, NIT Patna Verified email at nitp.ac.in. 6 — June 2019. The theoretical predictions based on linear stability analysis compare favorably with the experimental results. Steffen Hardt Professor, TU Darmstadt Verified email at nmf.tu-darmstadt.de. Therefore, SAW-induced EOF may be useful as a method for pumping liquids through small scale channels. M. Eigenbrod and S. Hardt, The effective shear and dilatational viscosities of a particle-laden interface in the dilute limit, Journal of Fluid Mechanics 903 (2020), A26. Babovsky, H. & Illner, R. 1989 A convergence proof for Nanbu’s simulation method for the full Boltzmann equation. https://www.fdy.tu-darmstadt.de/fdy/fdystaff/details_17472.de.jsp Philippe Bourrianne Princeton Verified email at princeton.edu. Sort. TU Darmstadt; Maschinenbau; Nano- und Mikrofluidik; Personal; Mitarbeiterinnen und … Together with cooperation partners from the Technion/Israel, we have studied the electroosmotic flow along superhydrophobic surfaces, augmented by gate electrodes. A summary of the main results can be found here. Reference: S. Hardt, J. Hartmann, S. Zhao, and A. Bandopadhyay, Electric-field-induced pattern formation in layers of DNA molecules at the interface between two immiscible liquids, Physical Review Letters 124 (2020), 064501.
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