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2020


Transient coarsening and the motility of optically heated Janus colloids in a binary liquid mixture
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, pages: 8359-8371, Royal Society of Chemistry, August 2020 (article)

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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link (url) DOI [BibTex]

2020


link (url) DOI [BibTex]


Interface-mediated spontaneous symmetry breaking and mutual communication between drops containing chemically active particles
Interface-mediated spontaneous symmetry breaking and mutual communication between drops containing chemically active particles

Singh, D., Domínguez, A., Choudhury, U., Kottapalli, S., Popescu, M., Dietrich, S., Fischer, P.

Nature Communications, 11(2210), May 2020 (article)

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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link (url) DOI [BibTex]


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Axisymmetric spheroidal squirmers and self-diffusiophoretic particles

Pöhnl, R., Popescu, M. N., Uspal, W. E.

Journal of Physics: Condensed Matter, 32(16), IOP Publishing, Bristol, 2020 (article)

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DOI [BibTex]

DOI [BibTex]


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Tracer diffusion on a crowded random Manhattan lattice

Mej\’\ia-Monasterio, C., Nechaev, S., Oshanin, G., Vasilyev, O.

New Journal of Physics, 22(3), IOP Publishing, Bristol, 2020 (article)

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DOI [BibTex]

DOI [BibTex]


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Wetting transitions on soft substrates

Napiorkowski, M., Schimmele, L., Dietrich, S.

{EPL}, 129(1), EDP Science, Les-Ulis, 2020 (article)

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DOI [BibTex]

DOI [BibTex]


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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), American Physical Society, Woodbury, N.Y., 2020 (article)

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DOI [BibTex]

DOI [BibTex]


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Interplay of quenching temperature and drift in Brownian dynamics

Khalilian, H., Nejad, M. R., Moghaddam, A. G., Rohwer, C. M.

EPL, 128(6), EDP Science, Les-Ulis, 2020 (article)

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DOI [BibTex]

DOI [BibTex]


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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, pages: 435-448, Elsevier, Amsterdam, 2020 (article)

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DOI [BibTex]


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Effective pair interaction of patchy particles in critical fluids

Farahmand Bafi, N., Nowakowski, P., Dietrich, S.

The Journal of Chemical Physics, 152(11), American Institute of Physics, Woodbury, N.Y., 2020 (article)

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DOI [BibTex]

DOI [BibTex]


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Cassie-Wenzel transition of a binary liquid mixture on a nanosculptured surface

Singh, S. L., Schimmele, L., Dietrich, S.

Physical Review E, 101(5), American Physical Society, Melville, NY, 2020 (article)

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DOI [BibTex]

DOI [BibTex]


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Energy storage in steady states under cyclic local energy input

Zhang, Y., Holyst, R., Maciolek, A.

Physical Review E, 101(1), American Physical Society, Melville, NY, 2020 (article)

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DOI [BibTex]


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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 (article)

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DOI [BibTex]

2006


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Effective forces between colloids at interfaces induced by capillary wavelike fluctuations

Lehle, H., Oettel, M., Dietrich, S.

Europhysics Letters, 75(1):174-180, 2006 (article)

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Influence of voltage on the phase behavior of a zenithally bistable liquid crystal device

Harnau, L., Dietrich, S.

Europhysics Letters, 73, pages: 28-34, 2006 (article)

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Lateral and normal forces between patterned substrates induced by nematic fluctuations

Karimi Pour Haddadan, F., Dietrich, S.

Physical Review E, 73, 2006 (article)

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From pair correlations to pair interactions: an exact relation in one-dimensional systems

Hansen-Goos, H., Lutz, C., Bechinger, C., Roth, R.

Europhysics Letters, 74, pages: 8-14, 2006 (article)

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Nonmonotonic fluctuation spectra of membranes pinned or tethered discretely to a substrate

Merath, R.-J., Seifert, U.

Physical Review E, 73, 2006 (article)

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Thin-film flow influenced by thermal noise

Grün, G., Mecke, K., Rauscher, M.

Journal of Statistical Physics, 122(6):1261-1291, 2006 (article)

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Spin-density-wave order in cuprates

De Prato, M., Pelissetto, A., Vicari, E.

Physical Review B, 74(14), 2006 (article)

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Motion of nanodroplets near edges and wedges

Moosavi, A., Rauscher, M., Dietrich, S.

Physical Review Letters, 97(23), 2006 (article)

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[BibTex]

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Slow dynamics at critical points: the field-theoretical perspective

Gambassi, A.

In Journal of Physics: Conference Series, 40, pages: 13-26, Luxembourg City [Luxembourg], 2006 (inproceedings)

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DOI [BibTex]


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The solution structure of stilbenoid dendrimers: a small-angle scattering study

Rosenfeldt, S., Karpuk, E., Lehmann, M., Meier, H., Lindner, P., Harnau, L., Ballauff, M.

ChemPhysChem, 7, pages: 2097-2104, 2006 (article)

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Effect of many-body interactions on the bulk and interfacial phase behavior of a model colloid-polymer mixture

Dijkstra, M., van Roij, R., Roth, R., Fortini, A.

Physical Review E, 73, 2006 (article)

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Lattice-Boltzmann study of the transition from quasi-two-dimensional to three-dimensional one particle systems

Frydel, D., Rice, S.

Molecular Physics, 104(8):1283-1297, 2006 (article)

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[BibTex]


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Critical ageing of Ising ferromagnets relaxing from an ordered state

Calabrese, P., Gambassi, A., Krzakala, F.

Journal of Statistical Mechanics: Theory and Experiment, 2006 (article)

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Morphometric approach to the solvation free energy of complex molecules

Roth, R., Harano, Y., Kinoshita, M.

Physical Review Letters, 97, 2006 (article)

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Critical Casimir Effect in 3He-4He Films

Maciolek, A., Dietrich, S.

Europhysics Letters, 74(1):22-28, 2006 (article)

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Pearling instability of nanoscale fluid flow confined to a chemical channel

Koplik, J., Lo, T. S., Rauscher, M., Dietrich, S.

Physics of Fluids, 18, 2006 (article)

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DOI [BibTex]


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Forces between chemically structured substrates mediated by critical fluids

Sprenger, M., Schlesener, F., Dietrich, S.

The Journal of Chemical Physics, 124, 2006 (article)

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[BibTex]


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Microscopic theory for interface fluctuations in binary liquid mixtures

Hiester, T., Dietrich, S., Mecke, K.

Journal of Chemical Physics, 125(18), 2006 (article)

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[BibTex]


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Complete wetting of nanosculptured substrates

Tasinkevych, M., Dietrich, S.

Physical Review Letters, 97(10), 2006 (article)

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[BibTex]

[BibTex]


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Shear viscosity of claylike colloids in computer simulations and experiments

Hecht, M., Harting, J., Bier, M., Reinshagen, J.

Physical Review E, 74(2), 2006 (article)

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[BibTex]

[BibTex]


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On the energetics of protein folding in aqueous solution

Harano, Y., Roth, R., Kinoshita, M.

Chemical Physics Letters, 432, pages: 275-280, 2006 (article)

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Colloidal particles at a nematic-isotropic interface: effects of confinement

West, J. L., Zhang, K., Glushchenko, A., Andrienko, D., Tasinkevych, M., Reznikov, Y.

European Physical Journal E, 20(2):237-242, 2006 (article)

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Depletion potential between large spheres immersed in a multicomponent mixture of small spheres

Roth, R., Kinoshita, M.

The Journal of Chemical Physics, 125, 2006 (article)

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[BibTex]


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Surface properties of fluids of charged platelike colloids

Bier, M., Harnau, L., Dietrich, S.

Journal of Chemical Physics, 125(18), 2006 (article)

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[BibTex]

[BibTex]


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Depletion forces between nonspherical objects

Koenig, P., Roth, R., Dietrich, S.

Physical Review E, 74, 2006 (article)

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[BibTex]


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Critical dynamics in thin films

Gambassi, A., Dietrich, S.

Journal of Statistical Physics, 123(5):929-1005, 2006 (article)

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[BibTex]


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Measurement of neutron flux and beam divergence at the cold neutron guide system of the new Munich research reactor FRM-II

Zeitelhack, K., Schanzer, C., Kastenmüller, A., Röhrmoser, A., Daniel, C., Franke, J., Gutsmiedl, E., Kudryashov, V., Maier, D., Päthe, D., Petry, W., Schöffel, T., Schreckenbach, K., Urban, A., Wildgruber, U.

Nuclear Instruments \& Methods in Physics Research A, 560, pages: 444-453, 2006 (article)

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A thin-film model for corotational Jeffreys fluids under strong slip

Münch, A., Wagner, B., Rauscher, M., Blossey, R.

The European Physical Journal e - Soft Matter, 20(4):365-368, 2006 (article)

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Slip-controlled thin-film dynamics

Fetzer, R., Rauscher, M., Münch, A., Wagner, B. A., Jacobs, K.

Europhysics Letters, 75(4):638-644, 2006 (article)

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Capillary evaporation in pores

Roth, R., Kroll, K. M.

Journal of Physics: Condensed Matter, 18, pages: 6517-6530, 2006 (article)

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Step dynamics on vicinal surfaces using discrete interface models

Upton, P. J.

Physical Review E, 73(3), 2006 (article)

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Comment on electrodipping force acting on solid particles at a fluid interface

Oettel, M., Dominguez, A., Dietrich, S.

Langmuir, 22(2):846-847, 2006 (article)

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Grazing-incidence small-angle X-ray scattering from thin polymer films with lamellar structures –the scattering cross section in the distorted-wave Born approximation

Busch, P., Rauscher, M., Smilgies, D.-M., Posselt, D., Papadakis, C. M.

Journal of Applied Crystallography, 39(3):433-442, 2006 (article)

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DOI [BibTex]


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Diffusion-limited deposition with dipolar interactions: fractal dimension and multifractal structure

Tasinkevych, M., Tavares, J. M., de los Santos, F.

The Journal of Chemical Physics, 124(6), 2006 (article)

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[BibTex]


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Density functional theory for hard-sphere mixtures: the White Bear version mark II

Hansen-Goos, H., Roth, R.

Journal of Physics: Condensed Matter, 18, pages: 8413-8425, 2006 (article)

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A new generalization of the Carnahan-Starling equation of state to additive mixtures of hard spheres

Hansen-Goos, H., Roth, R.

Journal of Chemical Physics, 124, 2006 (article)

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[BibTex]