Publications

Theory of Inhomogeneous Condensed Matter Article The role of counterions in ionic liquid crystals Bartsch, H., Bier, M., Dietrich, S. The Journal of Chemical Physics, 154(1):014901, American Institute of Physics, Woodbury, N.Y., 2021 (Published) DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article The role of dimensionality and geometry in quench-induced nonequilibrium forces Nejad, M. R., Khalilian, H., Rohwer, C. M., Moghaddam, A. G. Journal of Physics: Condensed Matter, 33(37):375102, IOP Publishing, Bristol, 2021 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Transport of neutral and charged nanorods across varying-section channels Malgaretti, P., Harting, J. Soft Matter, 17(8):2062-2070, Royal Society of Chemistry, Cambridge, UK, 2021 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Wetting behavior of a colloidal particle trapped at a composite liquid-vapor interface of a binary liquid mixture Kim, H., Schimmele, L., Dietrich, S. Physical Review E, 103(4):042802, American Physical Society, Melville, NY, 2021 (Published) DOI BibTeX

Micro, Nano, and Molecular Systems Theory of Inhomogeneous Condensed Matter Article Microchannels with Self-Pumping Walls Yu, T., Athanassiadis, A. G., Popescu, M. N., Chikkadi, V., Güth, A., Singh, D. P., Qiu, T., Fischer, P. ACS Nano, 14(10):13673-13680, September 2020

Abstract ›

When asymmetric Janus micromotors are immobilized on a surface, they act as chemically powered micropumps, turning chemical energy from the fluid into a bulk flow. However, such pumps have previously produced only localized recirculating flows, which cannot be used to pump fluid in one direction. Here, we demonstrate that an array of three-dimensional, photochemically active Au/TiO2 Janus pillars can pump water. Upon UV illumination, a water-splitting reaction rapidly creates a directional bulk flow above the active surface. By lining a 2D microchannel with such active surfaces, various flow profiles are created within the channels. Analytical and numerical models of a channel with active surfaces predict flow profiles that agree very well with the experimental results. The light-driven active surfaces provide a way to wirelessly pump fluids at small scales and could be used for real-time, localized flow control in complex microfluidic networks.

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Theory of Inhomogeneous Condensed Matter Article Transient coarsening and the motility of optically heated Janus colloids in a binary liquid mixture Gomez-Solano, J., Roy, S., Araki, T., Dietrich, S., Maciolek, A. Soft Matter, 16(36):8359-8371, Royal Society of Chemistry, August 2020

Abstract ›

A gold-capped Janus particle suspended in a near-critical binary liquid mixture can self-propel under illumination. We have immobilized such a particle in a narrow channel and carried out a combined experimental and theoretical study of the non-equilibrium dynamics of a binary solvent around it – lasting from the very moment of switching illumination on until the steady state is reached. In the theoretical study we use both a purely diffusive and a hydrodynamic model, which we solve numerically. Our results demonstrate a remarkable complexity of the time evolution of the concentration field around the colloid. This evolution is governed by the combined effects of the temperature gradient and the wettability, and crucially depends on whether the colloid is free to move or is trapped. For the trapped colloid, all approaches indicate that the early time dynamics is purely diffusive and characterized by composition layers travelling with constant speed from the surface of the colloid into the bulk of the solvent. Subsequently, hydrodynamic effects set in. Anomalously large nonequilibrium fluctuations, which result from the temperature gradient and the vicinity of the critical point of the binary liquid mixture, give rise to strong concentration fluctuations in the solvent and to permanently changing coarsening patterns not observed for a mobile particle. The early time dynamics around initially still Janus colloids produces a force which is able to set the Janus colloid into motion. The propulsion due to this transient dynamics is in the direction opposite to that observed after the steady state is attained.

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Theory of Inhomogeneous Condensed Matter Ph.D. Thesis Electrolyte solutions at heterogeneously charged surfaces Mußotter, M. Universität Stuttgart, Stuttgart, July 2020 DOI URL BibTeX

Theory of Inhomogeneous Condensed Matter Ph.D. Thesis Linear response theory for equilibrium systems perturbed by nonconservative forces: the role of symmetries Asheichyk, K. Universität Stuttgart, Stuttgart, July 2020 DOI URL BibTeX

Micro, Nano, and Molecular Systems Theory of Inhomogeneous Condensed Matter Article Interface-mediated spontaneous symmetry breaking and mutual communication between drops containing chemically active particles Singh, D. P., Domínguez, A., Choudhury, U., Kottapalli, S. N., Popescu, M. N., Dietrich, S., Fischer, P. Nature Communications, 11:2210, May 2020

Abstract ›

Symmetry breaking and the emergence of self-organized patterns is the hallmark of com- plexity. Here, we demonstrate that a sessile drop, containing titania powder particles with negligible self-propulsion, exhibits a transition to collective motion leading to self-organized ﬂow patterns. This phenomenology emerges through a novel mechanism involving the interplay between the chemical activity of the photocatalytic particles, which induces Mar- angoni stresses at the liquid–liquid interface, and the geometrical conﬁnement provided by the drop. The response of the interface to the chemical activity of the particles is the source of a signiﬁcantly ampliﬁed hydrodynamic ﬂow within the drop, which moves the particles. Furthermore, in ensembles of such active drops long-ranged ordering of the ﬂow patterns within the drops is observed. We show that the ordering is dictated by a chemical com- munication between drops, i.e., an alignment of the ﬂow patterns is induced by the gradients of the chemicals emanating from the active particles, rather than by hydrodynamic interactions.

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Theory of Inhomogeneous Condensed Matter Bachelor Thesis Nichtgleichgewichtsdynamik einer abgekühlten kritischen Flüssigkeit mit Oberflächenfeldern unterschiedlichen Vorzeichens Dertli, D. Universität Stuttgart, Stuttgart, January 2020 BibTeX

Theory of Inhomogeneous Condensed Matter Article Activated diffusiophoresis Rohwer, C. M., Kardar, M., Krüger, M. The Journal of Chemical Physics, 152(8):084109, American Institute of Physics, Woodbury, N.Y., 2020 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Book Chapter Adopting the Boundary Homogenization Approximation from Chemical Kinetics to Motile Chemically Active Particles Popescu, M. N., Uspal, W. E. In Chemical Kinetics, 517-540, (Editors: Lindenberg, Katja and Metzler, Ralf and Oshanin, Gleb), World Scientific, New Jersey, NJ, 2020 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Apparent phototaxis enabled by Brownian motion Niese, L., Wang, L., Das, S., Simmchen, J. Soft Matter, 16(47):10585-10590, Royal Society of Chemistry, Cambridge, UK, 2020 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Axisymmetric spheroidal squirmers and self-diffusiophoretic particles Pöhnl, R., Popescu, M. N., Uspal, W. E. Journal of Physics: Condensed Matter, 32(16):164001, IOP Publishing, Bristol, 2020 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Ballistic propagation of density correlations and excess wall forces in quenched granular media Schindler, T., Rohwer, C. M. Physical Review E, 102(5):052901, 2020 DOI URL BibTeX

Theory of Inhomogeneous Condensed Matter Article Behavior of the van der Waals force between a plate and a single-walled carbon nanotube under uniform hydrostatic pressure: a theoretical study Valchev, G., Djondjorov, P., Vassilev, V., Dantchev, D. Journal of Physics: Condensed Matter, 32(40):405001, IOP Publishing, Bristol, 2020 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Blessing and Curse: How a Supercapacitor Large Capacitance Causes its Slow Charging Lian, C., Janssen, M., Liu, H., van Roij, R. Physical Review Letters, 124(7):076001, American Physical Society, Woodbury, N.Y., 2020 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Bridging transitions and capillary forces for colloids in a slit Vasilyev, O. A., Labbe-Laurent, M., Dietrich, S., Kondrat, S. The Journal of Chemical Physics, 153(1):014901, American Institute of Physics, Woodbury, N.Y., 2020 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Bulk ionic screening lengths from extremely large-scale molecular dynamics simulations Zeman, J., Kondrat, S., Holm, C. Chemical Communications, 56(100):15635-15638, Royal Society of Chemistry, Cambridge, UK, 2020 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Cassie-Wenzel transition of a binary liquid mixture on a nanosculptured surface Singh, S. L., Schimmele, L., Dietrich, S. Physical Review E, 101(5):052115, American Physical Society, Melville, NY, 2020 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Charge symmetry broken complex coacervation Majee, A., Bier, M., Blossey, R., Podgornik, R. Physical Review Research, 2(4):043417, American Physical Society (APS), College Park, Maryland, United States, 2020 (Published) DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Chemically Active Particles: From One to Few on the Way to Many Popescu, M. N. Langmuir, 36(25):6861-6870, American Chemical Society, Columbus, OH, 2020 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Critical Casimir interaction between colloidal Janus-type particles in two spatial dimensions Squarcini, A., Maciolek, A., Eisenriegler, E., Dietrich, S. Journal of Statistical Mechanics: Theory and Experiment, 2020(4):043208, Institute of Physics Publishing, Bristol, England, 2020 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Critical energy-density profile near walls Borjan, Z., Vasilyev, O. A., Upton, P. J., Dietrich, S. Physical Review E, 102(2):022805, American Physical Society, Melville, NY, 2020 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Effective pair interaction of patchy particles in critical fluids Farahmand Bafi, N., Nowakowski, P., Dietrich, S. The Journal of Chemical Physics, 152(11):114902, American Institute of Physics, Woodbury, N.Y., 2020 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Electrostatic pair-interaction of nearby metal or metal-coated colloids at fluid interfaces Bebon, R., Majee, A. The Journal of Chemical Physics, 153(4):044903, American Institute of Physics, Woodbury, N.Y., 2020 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Energy storage in steady states under cyclic local energy input Zhang, Y., Holyst, R., Maciolek, A. Physical Review E, 101(1):012127, American Physical Society, Melville, NY, 2020 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Finite-size corrections for the static structure factor of a liquid slab with open boundaries Höfling, F., Dietrich, S. The Journal of Chemical Physics, 153(5):054119, American Institute of Physics, Woodbury, N.Y., 2020 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Floor- or Ceiling-Sliding for Chemically Active, Gyrotactic, Sedimenting Janus Particles Das, S., Jalilvand, Z., Popescu, M. N., Uspal, W. E., Dietrich, S., Kretzschmar, I. Langmuir, 36(25):7133-7147, American Chemical Society, Columbus, OH, 2020 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Fractal-seaweeds type functionalization of graphene Amsharov, K., Sharapa, D. I., Vasilyev, O. A., Martin, O., Hauke, F., Görling, A., Soni, H., Hirsch, A. Carbon, 158:435-448, Elsevier, Amsterdam, 2020 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Heterogeneous surface charge confining an electrolyte solution Mußotter, M., Bier, M., Dietrich, S. The Journal of Chemical Physics, 152(23):234703, American Institute of Physics, Woodbury, N.Y., 2020 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article How to speed up ion transport in nanopores Breitsprecher, K., Janssen, M., Srimuk, P., Layla Mehdi, B., Presser, V., Holm, C., Kondrat, S. Nature Communications, 11:6085, Nature Publishing Group, London, 2020 (Published) DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Inhomogeneous surface tension of chemically active fluid interfaces Squarcini, A., Malgaretti, P. The Journal of Chemical Physics, 153(23):234903, American Institute of Physics, Woodbury, N.Y., 2020 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Interplay of quenching temperature and drift in Brownian dynamics Khalilian, H., Nejad, M. R., Moghaddam, A. G., Rohwer, C. M. EPL, 128(6):60006, EDP Science, Les-Ulis, 2020 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Macromolecular Crowding: How Shape and Interactions Affect Diffusion Skóra, T., Vaghefikia, F., Fitter, J., Kondrat, S. The Journal of Physical Chemistry B, 124(35):7537-7543, American Chemical Society, Washington, D.C., 2020 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Numerical simulations of self-diffusiophoretic colloids at fluid interfaces Peter, T., Malgaretti, P., Rivas, N., Scagliarini, A., Harting, J., Dietrich, S. Soft Matter, 16(14):3536-3547, Royal Society of Chemistry, Cambridge, UK, 2020 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Particles, string and interface in the three-dimensional Ising model Delfino, G., Selke, W., Squarcini, A. Nuclear Physics (Amsterdam) B, 958:115139, North-Holland, Amsterdam, 2020 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Passive advection of fractional Brownian motion by random layered ﬂows Squarcini, A., Marinari, E., Oshanin, G. New Journal of Physics, 22(5):053052, IOP Publishing, Bristol, 2020 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Reconfiguring confined magnetic colloids with tunable fluid transport behavior Sheng, Z., Zhang, M., Liu, J., Malgaretti, P., Li, J., Wang, S., Lv, W., Zhang, R., Fan, Y., Zhang, Y., Chen, X., Hou, X. National Science Review, 8(5):nwaa301, Oxford University Press, Oxford, 2020 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Self-motility of an active particle induced by correlations in the surrounding solution Domínguez, A., Popescu, M. N., Rohwer, C. M., Dietrich, S. Physical Review Letters, 125(26):268002, 2020 DOI URL BibTeX

Theory of Inhomogeneous Condensed Matter Article Smoluchowski equations for linker-mediated irreversible aggregation Tavares, J. M., Antunes, G. C., Dias, C. S., Telo da Gama, M. M., Araujo, N. A. M. Soft Matter, 16(32):7513-7523, Royal Society of Chemistry, Cambridge, UK, 2020 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Storage of Energy in Constrained Non-Equilibrium Systems Zhang, Y., Gizynski, K., Maciolek, A., Holyst, R. Entropy, 22(5):557, MDPI, Basel, 2020 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Toward a density-functional theory for the Jagla fluid Gußmann, F., Dietrich, S., Roth, R. Physical Review E, 102(6):062112, American Physical Society, Melville, NY, 2020 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Tracer diffusion on a crowded random Manhattan lattice Mejía-Monasterio, C., Nechaev, S., Oshanin, G., Vasilyev, O. New Journal of Physics, 22(3):033024, IOP Publishing, Bristol, 2020 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Wetting transitions on soft substrates Napiorkowski, M., Schimmele, L., Dietrich, S. EPL, 129(1):16002, EDP Science, Les-Ulis, 2020 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Using the ﬂuctuation-dissipation theorem for nonconservative forces Asheichyk, K., Krüger, M. Physical Review Research, 1(3):033151, American Physical Society (APS), College Park, Maryland, United States, December 2019 (Published) DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Aging phenomena during phase separation in fluids: decay of autocorrelation for vapor-liquid transitions Roy, S., Bera, A., Majumder, S., Das, S. K. Soft Matter, 15(23):4743-4750, Royal Society of Chemistry, Cambridge, UK, May 2019 (Published)

Abstract ›

We performed molecular dynamics simulations to study relaxation phenomena during vapor–liquid transitions in a single component Lennard-Jones system. Results from two different overall densities are presented: one in the neighborhood of the vapor branch of the coexistence curve and the other being close to the critical density. The nonequilibrium morphologies, growth mechanisms and growth laws in the two cases are vastly different. In the low density case growth occurs via diffusive coalescence of droplets in a disconnected morphology. On the other hand, the elongated structure in the higher density case grows via advective transport of particles inside the tube-like liquid domains. The objective in this work has been to identify how the decay of the order-parameter autocorrelation, an important quantity to understand aging dynamics, differs in the two cases. In the case of the disconnected morphology, we observe a very robust power-law decay, as a function of the ratio of the characteristic lengths at the observation time and at the age of the system, whereas the results for the percolating structure appear rather complex. To quantify the decay in the latter case, unlike the standard method followed in a previous study, here we have performed a finite-size scaling analysis. The outcome of this analysis shows the presence of a strong preasymptotic correction, while revealing that in this case also, albeit in the asymptotic limit, the decay follows a power-law. Even though the corresponding exponents in the two cases differ drastically, this study, combined with a few recent ones, suggests that power-law behavior of this correlation function is rather universal in coarsening dynamics.

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Theory of Inhomogeneous Condensed Matter Article Active rotational dynamics of a self-diffusiophoretic colloidal motor Reigh, S., Huang, M., Löwen, H., Lauga, E., Kapral, R. Soft Matter, 16(5):1236-1245, 2019 (Published) DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Active Janus colloids at chemically structured surfaces Uspal, W. E., Popescu, M. N., Dietrich, S., Tasinkevych, M. The Journal of Chemical Physics, 150(20):204904, American Institute of Physics, Woodbury, N.Y., 2019 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Brownian dynamics assessment of enhanced diffusion exhibited by "fluctuating-dumbbell enzymes". Kondrat, S., Popescu, M. N. Physical Chemistry Chemical Physics, 21(35):18811-18815, Royal Society of Chemistry, Cambridge, England, 2019 DOI BibTeX

Publications

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