The droplet reciprocates between two aqueous reservoirs under the influence of a DC electric field. SAWs are acoustic waves travelling along the interface between a solid and a fluid. In addition, the flow is entirely pH-independent. Link: https://doi.org/10.1017/jfm.2019.921. hampe@tvt.tu-... work +49 6151 16-22520. Institute for Nano- and Microfluidics. B. Rofman, S. Dehe, V. Frumkin, S. Hardt, and M. Bercovici, Intermediate states of wetting on hierarchical superhydrophobic surfaces, Langmuir 36 (2020), 5517−5523. We find a multitude of intermediate states between the classical Cassie and Wenzel states. We have studied the transfer of chemical species between the two reservoirs mediated by the droplet. Reference: M. Shojaeian and S. Hardt, Mass transfer via femtoliter droplets in ping-pong mode, Physical Review Applied 13 (2020), 014015. Tobias Baier Center of Smart Interfaces, TU Darmstadt Потвърден имейл адрес: nmf.tu-darmstadt.de. Stability and collapse of holes in liquid layers - Volume 855 - Cunjing Lv, Michael Eigenbrod, Steffen Hardt T Baier, E Bick, C Wetterich. fluid dynamics microfluidics electrokinetics. 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. Physical Review B 70 (12), 125111, 2004. 26 (1), 45 – 65. Below, the same research outputs are grouped by subject. Dr. Dharmendra Tripathi Associate Professor, Mathematics, National Institute of Technology Uttarakhand Verified email at nituk.ac.in. Surfactants can immobilize fluid–liquid interfaces under shear stress. 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: Physics of Fluids, (2), 32. Therefore, SAW-induced EOF may be useful as a method for pumping liquids through small scale channels. 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. https://doi.org/10.1007/s10404-020-02342-6. Intermediate wetting states on superhydrophobic surfaces. DOI:10.1017/jfm.2019.921. In that case, ring-like structures are formed from the film. 1994 Molecular Gas Dynamics and the Direct Simulation of Gas Flows. Upon touching the reservoir, the droplet reverses its charge and its direction of motion. 6 Intitut für Angewandte Geowissenschaften, Technische Universität Darmstadt, Schnittspahnstraße 9, 64287 Darmstadt, Germany. Sort by citations Sort by year Sort by title. Steffen Hardt Professor, TU Darmstadt Verified email at nmf.tu-darmstadt.de. “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. M. Dietzel and S. Hardt, Electroosmotic flow in small-scale channels induced by surface-acoustic waves, Physical Review Fluids 5 (2020), 123702. 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. We have studied the transfer of chemical species between the two reservoirs mediated by the droplet. 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. Electronic address: stark@pos.tu-darmstadt.de. Institute for Nano- and Microfluidics (NMF), TU Darmstadt . Steffen Hardt. References (Subscription Required) Click to Expand. Administrative Staff Corinna Neumann. 5, Iss. Therefore, SAW-induced EOF may be useful as a method for pumping liquids through small scale channels. Our research extends over a broad thematic spectrum and combines experimental, theoretical and numerical approaches. Reuse & Permissions . Weian Sheng Airbnb, Intel, University of Florida Verified email at airbnb.com. 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. Year; Temperature dependence of antiferromagnetic order in the Hubbard model. Journal of Fluid Mechanics 883, 47 (2020). Microfluid Nanofluid 24, 41 (2020). Issue . A summary of the main results can be found here. S. 025108, ISSN 1070-6631, DOI: 10.1063/1.5141165, [Online-Edition: https://doi.org/10.1063/1.5141165], [Artikel] Nature Index 2020 Artificial Intelligence. 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. We have experimentally studied the concentration patterns and formulated a theory describing the pattern formation. Electroosmotic flow (EOF) induced by surface acoustic waves. Now imaging shrinking the diameter of the wine glass to one millimeter. SIAM J. Numer. Upon touching the reservoir, the droplet reverses its charge and its direction of motion. Duval CNRS Research Director - LIEC Laboratory (Nancy, France) Verified email at univ-lorraine.fr. 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. References. Hirofumi Shintaku RIKEN Hakubi Team Leader Verified email at me.kyoto-u.ac.jp. Seyed Mahmood Mousavi High Performance Computing center (HPCC) Потвърден имейл адрес: shirazu.ac.ir. No articles found. Artificial intelligence is one of the most rapidly advancing and controversial topics in scientific research. DOI: 10.1017/jfm.2020.80, Pattern formation in layers of DNA molecules. Bird, G. A. Please find below all contacts to board, project coordinators, researchers, administrative and technical staff of the CRC 1194. Institute for Nano- and Microfluidics, TU Darmstadt, 64287 Darmstadt, Germany * hardt@nmf.tu-darmstadt.de; Article Text (Subscription Required) Click to Expand. 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. Tobias Baier Center of Smart Interfaces, TU Darmstadt Verified email at nmf.tu-darmstadt.de. Ehsan Ro Reuse & Permissions. In that case, ring-like structures are formed from the film. Link: https://doi.org/10.1017/jfm.2019.921. 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. Philippe Davy directeur de recherche, CNRS, Rennes Verified email at univ-rennes1.fr. Nanoscale gas kinetics, electrokinetics, interfacial flows, wetting phenomena and biomolecular separation belong to our areas of work. A summary of the main results can be found here. TU Darmstadt; Maschinenbau; Nano- and Microfluidics; Staff; People Name Working area(s) Contact; Director of the institute Prof. Dr. rer. Philippe Bourrianne Princeton Verified email at princeton.edu. Sort. Office. Please find below older news relating to research at the Institute for Nano- and Microfluidics. Title. References (Subscription Required) Click to Expand. Institut für Druckmaschinen und Druckverfahren, TU Darmstadt Germany . Your browser does not support the video element. “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. Principal institution: Technical University of Darmstadt (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 October 2019 - 30 September 2020 which are tracked by the Nature Index. 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. 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. Now imaging shrinking the diameter of the wine glass to one millimeter. Intermediate wetting states on superhydrophobic surfaces. Together with cooperation partners from the Technion/Israel, we have studied the electroosmotic flow along superhydrophobic surfaces, augmented by gate electrodes. In that case, the viscosity coefficients represent the dissipation due to the presence of particles or surfactants in an average manner. Cited by. In that context we are especially interested in studying fundamentals, with the intention to pave the way for novel applications. TU Darmstadt incorporates diverse science cultures to create its characteristic profile. DOI:10.1017/jfm.2019.921. DNA molecules can be concentrated by electrophoretic accumulation at an interface between two immiscible polymer solutions. 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. 82-85, Proc. DOI: 10.1017/jfm.2020.80, Pattern formation in layers of DNA molecules. 7 Physics of Surfaces, Technische Universität Darmstadt, Alarich-Weiss-Straße 16, 64287 Darmstadt, Germany. 5 — May 2020. S. Dehe, B. Rofman, M. Bercovici, and S. Hardt, Electro-osmotic flow enhancement over superhydrophobic surfaces, Physical Review Fluids 5 (2020), 053701. Vol. 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. Transferring chemical species or nanoparticles in a controlled way becomes challenging when very small species amounts are considered. Supplemental Material (Subscription Required) Click to Expand. The theoretical predictions based on linear stability analysis compare favorably with the experimental results. 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. Click here for details, Species transfer using small droplets as carriers. Electronic address: hardt@nmf.tu-darmstadt.de. 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. The course language will be English. This kind of separation of gas species by mass or size plays an important role for many applications in chemical engineering. These liquid rings finally collapse and form plugs that are propelled along the capillary tube by evaporation. Verified email at nmf.tu-darmstadt.de. M. Dietzel and S. Hardt, Electroosmotic flow in small-scale channels induced by surface-acoustic waves, Physical Review Fluids 5 (2020), 123702. Surface acoustic waves (SAW) are widely used in microfluidics for transporting and mixing liquids. Baier, T., Hardt, S. Gas separation in a Knudsen pump inspired by a Crookes radiometer. 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. ‡ Corresponding author: hardt@nmf.tu-darmstadt.de; Article Text (Subscription Required) Click to Expand. Nano- and Microfluidics BHANUMAN BARMAN Assistant Professor, NIT Patna Verified email at nitp.ac.in. † Email address for correspondence: hardt@nmf.tu-darmstadt.de. Click here for details, Species transfer using small droplets as carriers. As a stream encounters an obstacle, floating debris sometimes piles up in front of the obstacle, forming a dense layer on the water surface. 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. Contact. Microfluid Nanofluid 24, 41 (2020). Anal. We find a multitude of intermediate states between the classical Cassie and Wenzel states. Enhancement of electroosmotic flow on superhydrophobic surfaces. This kind of separation of gas species by mass or size plays an important role for many applications in chemical engineering. Enhancement of electroosmotic flow on superhydrophobic surfaces. 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. Steffen Hardt Professor, TU Darmstadt Verified email at nmf.tu-darmstadt.de. Hover over the donut graph to view the FC output for each subject. Unsere Forschung erstreckt sich über ein breites Themenspektrum und kombiniert experimentelle, theoretische und numerische Ansätze. 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. 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. Следене. DNA molecules can be concentrated by electrophoretic accumulation at an interface between two immiscible polymer solutions. Therefore, such a pump may be used for gas separation. 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. Usually, viscosity is a quantity associated with the bulk of a fluid. Steffen Hardt Professor, TU Darmstadt Потвърден имейл адрес: nmf.tu-darmstadt.de. Transferring chemical species or nanoparticles in a controlled way becomes challenging when very small species amounts are considered. References (Subscription Required) Click to Expand. nat. 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. 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. Steffen Hardt Professor, TU Darmstadt Verified email at nmf.tu-darmstadt.de. 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. Journal of Fluid Mechanics 883, 47 (2020). About TU Darmstadt – The Technical University (TU) of Darmstadt is one of Germany’s leading technical universities. Surface acoustic waves (SAW) are widely used in microfluidics for transporting and mixing liquids. Latest supplement. DOI: 10.1103/PhysRevApplied.13.014015. S. Dehe, B. Rofman, M. Bercovici, and S. Hardt, Electro-osmotic flow enhancement over superhydrophobic surfaces, Physical Review Fluids 5 (2020), 053701. 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. https://doi.org/10.1007/s10404-020-02342-6. TU Darmstadt; Maschinenbau; Nano- und Mikrofluidik; Personal; Mitarbeiterinnen und … A summary of the main results can be found here. L2|06 112. ‘Super-hydrophobic’ surfaces with embedded gas pockets have been suggested for reducing drag on objects moving through water. Nano- and Microfluidics You are here: TU Darmstadt; Maschinenbau; Nano- and Microfluidics; Sitemap. The course language will be English. These results could significantly simplify simulations of two-phase flows with particle-laden interfaces. L2|06 113. The method is sketched in the schematic on the left. DOI: 10.1103/PhysRevApplied.13.014015. Sitemap We have studied this phenomenon based on experiments and theory. You are here: TU Darmstadt; Maschinenbau; Nano- and Microfluidics; Home; Institute for Nano- and Microfluidics. In addition, the flow is entirely pH-independent. Up to now, the electrokinetic effects due to SAWs have remained largely unexplored. Cited by. In that case, the viscosity coefficients represent the dissipation due to the presence of particles or surfactants in an average manner. The method is sketched in the schematic on the left. Human resources department, International office: neumann@nmf.tu-... +49 6151 16-24277. Supplemental Material (Subscription Required) Click to Expand. We have studied this phenomenon based on experiments and theory. We have recently derived analytical expressions for the viscosity coefficients of a particle-laden fluid interface in the limit of low particle concentrations. B. Rofman, S. Dehe, V. Frumkin, S. Hardt, and M. Bercovici, Intermediate states of wetting on hierarchical superhydrophobic surfaces, Langmuir 36 (2020), 5517−5523. www.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. Dr. Naren Bag PhD, IIT Kharagpur Verified email at iitkgp.ac.in. 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. A: Alarich-Weiss-Straße 10, L2|06 111, 64287 Darmstadt, GER T: +49 6151 16-24276. If, however, small particles or surfactants are adsorbed to a gas-liquid or liquid-liquid interface, the interface itself becomes viscous. ‡ hardt@nmf.tu-darmstadt.de; Article Text (Subscription Required) Click to Expand. 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.

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