References (Subscription Required) Click to Expand. In addition, the flow is entirely pH-independent. Babovsky, H. & Illner, R. 1989 A convergence proof for Nanbu’s simulation method for the full Boltzmann equation. Institute for Nano- and Microfluidics (NMF), TU Darmstadt . Enhancement of electroosmotic flow on superhydrophobic surfaces. “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. 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. 6 — June 2019. SIAM J. Numer. ‘Super-hydrophobic’ surfaces with embedded gas pockets have been suggested for reducing drag on objects moving through water. 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particle inside a gas, the fluid dynamics of such problems becomes very involved, since the Navier-Stokes equation is no longer applicable. We have recently derived analytical expressions for the viscosity coefficients of a particle-laden fluid interface in the limit of low particle concentrations. Microfluid Nanofluid 24, 41 (2020). Issue. Therefore, such a pump may be used for gas separation. Mikrosystemtechnik Kongress 2011, Darmstadt, Germany, [Conference or Workshop Item] Hahn, T. (2011): Interfacial electrokinetic transport phenomena and their impact on DNA electrophoresis in microfluidics. Upon touching the reservoir, the droplet reverses its charge and its direction of motion. Nature Index 2020 Artificial Intelligence. Intermediate wetting states on superhydrophobic surfaces. christophe clanet CNRS, LadHyX, Ecole … ‘Super-hydrophobic’ surfaces with embedded gas pockets have been suggested for reducing drag on objects moving through water. Therefore, SAW-induced EOF may be useful as a method for pumping liquids through small scale channels. A summary of the main results can be found here. 6 Intitut für Angewandte Geowissenschaften, Technische Universität Darmstadt, Schnittspahnstraße 9, 64287 Darmstadt, Germany. We find a multitude of intermediate states between the classical Cassie and Wenzel states. 4, Iss. Enhancement of electroosmotic flow on superhydrophobic surfaces. hampe@tvt.tu-... work +49 6151 16-22520. 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. Steffen Hardt Professor, TU Darmstadt Verified email at nmf.tu-darmstadt.de. Issue . Electroosmotic flow (EOF) induced by surface acoustic waves. 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. 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. Anal. Electronic address: stark@pos.tu-darmstadt.de. nat. 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. We have experimentally studied the concentration patterns and formulated a theory describing the pattern formation. Return to institution outputs. Together with cooperation partners from the Technion/Israel, we have studied the electroosmotic flow along superhydrophobic surfaces, augmented by gate electrodes. DOI:10.1017/jfm.2019.921. Surfactants can immobilize fluid–liquid interfaces under shear stress. The droplet reciprocates between two aqueous reservoirs under the influence of a DC electric field. Upon touching the reservoir, the droplet reverses its charge and its direction of motion. 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. Philippe Bourrianne Princeton Verified email at princeton.edu. Welcome to the Institute for Nano- und Microfluidics. Institute of Applied Geosciences (IAG), TU Darmstadt . 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. If, however, small particles or surfactants are adsorbed to a gas-liquid or liquid-liquid interface, the interface itself becomes viscous. Usually, viscosity is a quantity associated with the bulk of a fluid. Steffen Hardt Professor, TU Darmstadt Verified email at nmf.tu-darmstadt.de. Surface acoustic waves (SAW) are widely used in microfluidics for transporting and mixing liquids. These liquid rings finally collapse and form plugs that are propelled along the capillary tube by evaporation. 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. ‡ hardt@nmf.tu-darmstadt.de; Article Text (Subscription Required) Click to Expand. Hide All. Below, the same research outputs are grouped by subject. Reuse & Permissions. Our research extends over a broad thematic spectrum and combines experimental, theoretical and numerical approaches. A summary of the main results can be found here. Surface acoustic waves (SAW) are widely used in microfluidics for transporting and mixing liquids. DNA molecules can be concentrated by electrophoretic accumulation at an interface between two immiscible polymer solutions. Unsere Forschung erstreckt sich über ein breites Themenspektrum und kombiniert experimentelle, theoretische und numerische Ansätze. In: Physics of Fluids, (2), 32. We have studied this phenomenon based on experiments and theory. Artificial intelligence is one of the most rapidly advancing and controversial topics in scientific research. References (Subscription Required) Click to Expand. Reference: M. Shojaeian and S. Hardt, Mass transfer via femtoliter droplets in ping-pong mode, Physical Review Applied 13 (2020), 014015. Institute for Nano- and Microfluidics, TU Darmstadt, 64287 Darmstadt, Germany * hardt@nmf.tu-darmstadt.de; Article Text (Subscription Required) Click to Expand. Nano- and Microfluidics You are here: TU Darmstadt; Maschinenbau; Nano- and Microfluidics; Sitemap. Please find below all contacts to board, project coordinators, researchers, administrative and technical staff of the CRC 1194. Therefore, such a pump may be used for gas separation. Please find below older news relating to research at the Institute for Nano- and Microfluidics. Ehsan Ro Together with cooperation partners from the Technion/Israel, we have studied the electroosmotic flow along superhydrophobic surfaces, augmented by gate electrodes. 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. Issue. DNA molecules can be concentrated by electrophoretic accumulation at an interface between two immiscible polymer solutions. Herzlich willkommen am Fachgebiet Nano- und Mikrofluidik. The theoretical predictions based on linear stability analysis compare favorably with the experimental results. As a stream encounters an obstacle, floating debris sometimes piles up in front of the obstacle, forming a dense layer on the water surface. Sort by citations Sort by year Sort by title. 7 Physics of Surfaces, Technische Universität Darmstadt, Alarich-Weiss-Straße 16, 64287 Darmstadt, Germany. Dr. Dharmendra Tripathi Associate Professor, Mathematics, National Institute of Technology Uttarakhand Verified email at nituk.ac.in. BHANUMAN BARMAN Assistant Professor, NIT Patna Verified email at nitp.ac.in. We have studied this phenomenon based on experiments and theory. 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. Knudsen pumps rely on gas-flows induced by temperature differences. Verified email at nmf.tu-darmstadt.de. 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. 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. These results could significantly simplify simulations of two-phase flows with particle-laden interfaces. Picture: NMF. Tobias Baier Center of Smart Interfaces, TU Darmstadt Потвърден имейл адрес: nmf.tu-darmstadt.de. Tobias Baier Center of Smart Interfaces, TU Darmstadt Verified email at nmf.tu-darmstadt.de. The course language will be English. In that case, ring-like structures are formed from the film. 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. In that context we are especially interested in studying fundamentals, with the intention to pave the way for novel applications. Link: https://doi.org/10.1017/jfm.2019.921. Baier, T., Hardt, S. Gas separation in a Knudsen pump inspired by a Crookes radiometer. 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. 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. Steffen Hardt Professor, TU Darmstadt Verified email at nmf.tu-darmstadt.de. Sitemap S. Dehe, B. Rofman, M. Bercovici, and S. Hardt, Electro-osmotic flow enhancement over superhydrophobic surfaces, Physical Review Fluids 5 (2020), 053701. We have experimentally studied the concentration patterns and formulated a theory describing the pattern formation. 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. B. Rofman, S. Dehe, V. Frumkin, S. Hardt, and M. Bercovici, Intermediate states of wetting on hierarchical superhydrophobic surfaces, Langmuir 36 (2020), 5517−5523. SAWs are acoustic waves travelling along the interface between a solid and a fluid. In addition, the flow is entirely pH-independent. 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. Baier, T., Hardt, S. Gas separation in a Knudsen pump inspired by a Crookes radiometer. This kind of separation of gas species by mass or size plays an important role for many applications in chemical engineering. Преглед на всички. 26 (1), 45 – 65. Institut für Druckmaschinen und Druckverfahren, TU Darmstadt Germany . https://doi.org/10.1007/s10404-020-02342-6. † Email address for correspondence: hardt@nmf.tu-darmstadt.de. Articles Cited by Co-authors. Transferring chemical species or nanoparticles in a controlled way becomes challenging when very small species amounts are considered. Sort. S. 025108, ISSN 1070-6631, DOI: 10.1063/1.5141165, [Online-Edition: https://doi.org/10.1063/1.5141165], [Artikel] Microfluid Nanofluid 24, 41 (2020). A: Alarich-Weiss-Straße 10, L2|06 111, 64287 Darmstadt, GER T: +49 6151 16-24276. 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. 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. Human resources department, International office: neumann@nmf.tu-... +49 6151 16-24277. Year; Temperature dependence of antiferromagnetic order in the Hubbard model. 82-85, Proc. We have recently derived analytical expressions for the viscosity coefficients of a particle-laden fluid interface in the limit of low particle concentrations. A summary of the main results can be found here. SAWs are acoustic waves travelling along the interface between a solid and a fluid. If, however, small particles or surfactants are adsorbed to a gas-liquid or liquid-liquid interface, the interface itself becomes viscous. Journal of Fluid Mechanics 883, 47 (2020). 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. T Baier, E Bick, C Wetterich. 5, Iss. https://www.fdy.tu-darmstadt.de/fdy/fdystaff/details_17472.de.jsp www.nmf.tu-darmstadt.de. Fachgebiet Nano- und Mikrofluidik – Herzlich willkommen am Fachgebiet Nano- und Mikrofluidik. TU Darmstadt; Maschinenbau; Nano- and Microfluidics; Staff; People Name Working area(s) Contact; Director of the institute Prof. Dr. rer. The method is sketched in the schematic on the left. ‡ Corresponding author: hardt@nmf.tu-darmstadt.de; Article Text (Subscription Required) Click to Expand. Office. Weian Sheng Airbnb, Intel, University of Florida Verified email at airbnb.com. Electronic address: kleebe@geo.tu-darmstadt.de. The theoretical predictions based on linear stability analysis compare favorably with the experimental results. 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. … 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. hardt@nmf.tu-... +49 6151 16-24274. About TU Darmstadt – The Technical University (TU) of Darmstadt is one of Germany’s leading technical universities. 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. In that case, the viscosity coefficients represent the dissipation due to the presence of particles or surfactants in an average manner. Click here for details, Species transfer using small droplets as carriers. Electroosmotic flow (EOF) induced by surface acoustic waves. Click here for details, Species transfer using small droplets as carriers. Stability and collapse of holes in liquid layers - Volume 855 - Cunjing Lv, Michael Eigenbrod, Steffen Hardt 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. The droplet reciprocates between two aqueous reservoirs under the influence of a DC electric field. Administrative Staff Corinna Neumann. Journal of Fluid Mechanics 883, 47 (2020). Steffen Hardt Professor, TU Darmstadt Verified email at nmf.tu-darmstadt.de. References. Dr. Naren Bag PhD, IIT Kharagpur Verified email at iitkgp.ac.in. Flow and streaming potential of an electrolyte in a channel with an axial temperature gradient - Volume 813 - Mathias Dietzel, Steffen Hardt We have studied the transfer of chemical species between the two reservoirs mediated by the droplet. Nanoscale gas kinetics, electrokinetics, interfacial flows, wetting phenomena and biomolecular separation belong to our areas of work. M. Dietzel and S. Hardt, Electroosmotic flow in small-scale channels induced by surface-acoustic waves, Physical Review Fluids 5 (2020), 123702. The method is sketched in the schematic on the left. 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. 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. This kind of separation of gas species by mass or size plays an important role for many applications in chemical engineering. Reference: M. Shojaeian and S. Hardt, Mass transfer via femtoliter droplets in ping-pong mode, Physical Review Applied 13 (2020), 014015. 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. Therefore, SAW-induced EOF may be useful as a method for pumping liquids through small scale channels. Usually, viscosity is a quantity associated with the bulk of a fluid. Unsere Forschung erstreckt sich über ein breites Themenspektrum und kombiniert experimentelle, theoretische und numerische Ansätze. 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. Reuse & Permissions . 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. The course language will be English. 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. S. Dehe, B. Rofman, M. Bercovici, and S. Hardt, Electro-osmotic flow enhancement over superhydrophobic surfaces, Physical Review Fluids 5 (2020), 053701. “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. 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. No articles found. Vol. We are concerned with transport phenomena in fluids on the nano- and micrometer scale. Hirofumi Shintaku RIKEN Hakubi Team Leader Verified email at me.kyoto-u.ac.jp. We have studied the transport of gas mixtures along a Knudsen pump and observed differences in flow of the individual components of the mixture. Transferring chemical species or nanoparticles in a controlled way becomes challenging when very small species amounts are considered. pp. Cited by. Tobias Baier Center of Smart Interfaces, TU Darmstadt Verified email at nmf.tu-darmstadt.de. Title. 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. The transition from the Cassie state to these intermediate states is partially reversible. fluid dynamics microfluidics electrokinetics. Steffen Hardt. Steffen Hardt Professor, TU Darmstadt Потвърден имейл адрес: nmf.tu-darmstadt.de. DOI: 10.1103/PhysRevApplied.13.014015. 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. Markus Biesalski Professor für Makromolekulare Chemie und Papierchemie, Technische Universität Darmstadt Verified email at cellulose.tu-darmstadt.de. Следене. Electronic address: hardt@nmf.tu-darmstadt.de. Hover over the donut graph to view the FC output for each subject. Zu unseren Arbeitsgebieten gehören Gaskinetik auf der Nanoskala, Elektrokinetik, Grenzflächenströmungen, Benetzungsphänomene und Trennprozesse für Biomoleküle. Now imaging shrinking the diameter of the wine glass to one millimeter. The transition from the Cassie state to these intermediate states is partially reversible. Working area(s) Emeritus. DOI:10.1017/jfm.2019.921. L2|06 112. As a stream encounters an obstacle, floating debris sometimes piles up in front of the obstacle, forming a dense layer on the water surface. TU Darmstadt; Maschinenbau; Nano- und Mikrofluidik; Personal; Mitarbeiterinnen und … Research; Relationships; 1 August 2019 - 31 July 2020. 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. DOI: 10.1017/jfm.2020.80, Pattern formation in layers of DNA molecules. We have studied the transport of gas mixtures along a Knudsen pump and observed differences in flow of the individual components of the mixture. Knudsen pumps rely on gas-flows induced by temperature differences. Up to now, the electrokinetic effects due to SAWs have remained largely unexplored. Nano- and Microfluidics Your browser does not support the video element. DOI: 10.1103/PhysRevApplied.13.014015. In that case, the viscosity coefficients represent the dissipation due to the presence of particles or surfactants in an average manner. In that case, ring-like structures are formed from the film. B. Rofman, S. Dehe, V. Frumkin, S. Hardt, and M. Bercovici, Intermediate states of wetting on hierarchical superhydrophobic surfaces, Langmuir 36 (2020), 5517−5523. Intermediate wetting states on superhydrophobic surfaces. Physical Review B 70 (12), 125111, 2004. These liquid rings finally collapse and form plugs that are propelled along the capillary tube by evaporation. Link: https://doi.org/10.1017/jfm.2019.921. 5 — May 2020. Seyed Mahmood Mousavi High Performance Computing center (HPCC) Потвърден имейл адрес: shirazu.ac.ir. Contact. Hongya Geng UCAS, ICCAS, Tsinghua, ICL Verified email at imperial.ac.uk. Philippe Davy directeur de recherche, CNRS, Rennes Verified email at univ-rennes1.fr. Tobias Baier Center of Smart Interfaces, TU Darmstadt Verified email at nmf.tu-darmstadt.de. Clarendon Press. Duval CNRS Research Director - LIEC Laboratory (Nancy, France) Verified email at univ-lorraine.fr. TU Darmstadt incorporates diverse science cultures to create its characteristic profile. L2|06 113. We have studied the transfer of chemical species between the two reservoirs mediated by the droplet. References (Subscription Required) Click to Expand. Song Jinlong The School of Mechanical Engineering, Dalian University of Technology Verified email at dlut.edu.cn. 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. 1994 Molecular Gas Dynamics and the Direct Simulation of Gas Flows. Download file × Up to now, the electrokinetic effects due to SAWs have remained largely unexplored. Zu unseren Arbeitsgebieten gehören Gaskinetik auf der Nanoskala, Elektrokinetik, Grenzflächenströmungen, Benetzungsphänomene und Trennprozesse für Biomoleküle. We find a multitude of intermediate states between the classical Cassie and Wenzel states. https://doi.org/10.1007/s10404-020-02342-6. Head of Institute. Bird, G. A. Supplemental Material (Subscription Required) Click to Expand. Latest supplement. A summary of the main results can be found here. Vol. You are here: TU Darmstadt; Maschinenbau; Nano- and Microfluidics; Home; Institute for Nano- and Microfluidics. Institute for Nano- and Microfluidics. Klingenberg, Dario ; Oberlack, Martin ; Pluemacher, Dominik (2020): Symmetries and turbulence modeling. Jérôme F.L. Now imaging shrinking the diameter of the wine glass to one millimeter. 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. These results could significantly simplify simulations of two-phase flows with particle-laden interfaces. 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. Supplemental Material (Subscription Required) Click to Expand. DOI: 10.1017/jfm.2020.80, Pattern formation in layers of DNA molecules. Cited by. 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.
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