Publications

Micro, Nano, and Molecular Systems Theory of Inhomogeneous Condensed Matter Article Active colloidal propulsion over a crystalline surface Choudhury, U., Straube, A., Fischer, P., Gibbs, J., Höfling, F. New Journal of Physics, 19:125010, December 2017 (Published)

Abstract ›

We study both experimentally and theoretically the dynamics of chemically self-propelled Janus colloids moving atop a two-dimensional crystalline surface. The surface is a hexagonally close-packed monolayer of colloidal particles of the same size as the mobile one. The dynamics of the self-propelled colloid reflects the competition between hindered diffusion due to the periodic surface and enhanced diffusion due to active motion. Which contribution dominates depends on the propulsion strength, which can be systematically tuned by changing the concentration of a chemical fuel. The mean-square displacements obtained from the experiment exhibit enhanced diffusion at long lag times. Our experimental data are consistent with a Langevin model for the effectively two-dimensional translational motion of an active Brownian particle in a periodic potential, combining the confining effects of gravity and the crystalline surface with the free rotational diffusion of the colloid. Approximate analytical predictions are made for the mean-square displacement describing the crossover from free Brownian motion at short times to active diffusion at long times. The results are in semi-quantitative agreement with numerical results of a refined Langevin model that treats translational and rotational degrees of freedom on the same footing.

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Physical Intelligence Theory of Inhomogeneous Condensed Matter Article Magnetotactic bacteria powered biohybrids target e. coli biofilms Stanton, M. M., Park, B., Vilela, D., Bente, K., Faivre, D., Sitti, M., Sánchez, S. ACS Nano, 11(10):9968-9978, September 2017

Abstract ›

Biofilm colonies are typically resistant to general antibiotic treatment and require targeted methods for their removal. One of these methods includes the use of nanoparticles as carriers for antibiotic delivery, where they randomly circulate in fluid until they make contact with the infected areas. However, the required proximity of the particles to the biofilm results in only moderate efficacy. We demonstrate here that the nonpathogenic magnetotactic bacteria Magnetosopirrillum gryphiswalense (MSR-1) can be integrated with drug-loaded mesoporous silica microtubes to build controllable microswimmers (biohybrids) capable of antibiotic delivery to target an infectious biofilm. Applying external magnetic guidance capability and swimming power of the MSR-1 cells, the biohybrids are directed to and forcefully pushed into matured Escherichia coli (E. coli) biofilms. Release of the antibiotic, ciprofloxacin, is triggered by the acidic microenvironment of the biofilm, ensuring an efficient drug delivery system. The results reveal the capabilities of a nonpathogenic bacteria species to target and dismantle harmful biofilms, indicating biohybrid systems have great potential for antibiofilm applications.

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Physical Intelligence Theory of Inhomogeneous Condensed Matter Article Biohybrid microtube swimmers driven by single captured bacteria Stanton, M. M., Park, B., Miguel-López, A., Ma, X., Sitti, M., Sánchez, S. Small, 13(19):1603679, March 2017

Abstract ›

Bacteria biohybrids employ the motility and power of swimming bacteria to carry and maneuver microscale particles. They have the potential to perform microdrug and cargo delivery in vivo, but have been limited by poor design, reduced swimming capabilities, and impeded functionality. To address these challenge, motile Escherichia coli are captured inside electropolymerized microtubes, exhibiting the first report of a bacteria microswimmer that does not utilize a spherical particle chassis. Single bacterium becomes partially trapped within the tube and becomes a bioengine to push the microtube though biological media. Microtubes are modified with “smart” material properties for motion control, including a bacteria-attractant polydopamine inner layer, addition of magnetic components for external guidance, and a biochemical kill trigger to cease bacterium swimming on demand. Swimming dynamics of the bacteria biohybrid are quantified by comparing “length of protrusion” of bacteria from the microtubes with respect to changes in angular autocorrelation and swimmer mean squared displacement. The multifunctional microtubular swimmers present a new generation of biocompatible micromotors toward future microbiorobots and minimally invasive medical applications.

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Theory of Inhomogeneous Condensed Matter Article A Gaussian theory for fluctuations in simple liquids Krüger, M., Dean, D. S. The Journal of Chemical Physics, 146(13), American Institute of Physics, Woodbury, N.Y., 2017 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Action at a distance in classical uniaxial ferromagnetic arrays Abraham, D. B., Maciolek, A., Squarcini, A., Vasilyev, O. Physical Review E, 96(4):042154, American Physical Society, Melville, NY, 2017 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Active Particle Accumulation at Boundaries: A Strategy to Measure Contact Angles Simmchen, J., Malgaretti, P. ChemNanoMat, 3(11):790-793, Wiley, Weinheim, 2017 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Active colloids in the context of chemical kinetics Oshanin, G., Popescu, M. N., Dietrich, S. Journal of Physics A, 50(13):134001, IOP Pub., Bristol, 2017 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Anisotropic Self-Assembly from Isotropic Colloidal Building Blocks Rey, M., Law, A. D., Buzza, D. M. A., Vogel, N. Journal of the American Chemical Society, 139(48):17464-17473, American Chemical Society, Washington, DC, 2017 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Basic features of proton-proton interactions at ultra-relativistic energies and RFT-based quark-gluon string model Zabrodin, E., Bravina, L., Bleibel, J. EPJ Web of Conferences, 164, EDP Sciences, Les Ulis, 2017 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Bio-catalytic mesoporous Janus nano-motors powered by catalase enzyme Ma, X., Sánchez, S. Tetrahedron, 73(33):4883-4886, Elsevier Science, Kidlington, 2017 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Bistability, Oscillations, and Bidirectional Motion of Ensemble of Hydrodynamically Coupled Molecular Motors Malgaretti, P., Pagonabarraga, I., Joanny, J. Physical Review Letters, 119(16):168101, American Physical Society, Woodbury, N.Y., 2017 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Bubble gating in biological ion channels: A density functional theory study Gußmann, F., Roth, R. Physical Review E, 95(6), American Physical Society, Melville, NY, 2017 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Chemically active colloids near osmotic-responsive walls with surface-chemistry gradients Popescu, M. N., Uspal, W. E., Dietrich, S. Journal of Physics: Condensed Matter, 29(13):134001, IOP Publishing, Bristol, 2017 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Master Thesis Collective dynamics of laterally confined active particles near fluid-fluid interfaces Kistner, I. Universität Stuttgart, Stuttgart, 2017 BibTeX

Theory of Inhomogeneous Condensed Matter Article Cooperative behavior of biased probes in crowded interacting systems Vasilyev, O., Bénichou, O., Mejía-Monasterio, C., Weeks, E. R., Oshanin, G. Soft Matter, 13(41):7617-7624, Royal Society of Chemistry, Cambridge, UK, 2017 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Critical Casimir interactions between colloids around the critical point of binary solvents Stuij, S. G., Labbe-Laurent, M., Kodger, T. E., Maciolek, A., Schall, P. Soft Matter, 13(31):5233-5249, Royal Society of Chemistry, Cambridge, UK, 2017 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Designing Micro- and Nanoswimmers for Specific Applications Katuri, J., Ma, X., Stanton, M. M., Sanchez, S. Accounts of Chemical Research, 50(1):2-11, American Chemical Society, Easton, Pa., 2017 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Effect of boundaries on vacuum field fluctuations and radiation-mediated interactions between atoms Armata, F., Butera, S., Fiscelli, G., Incardone, R., Notararigo, V., Palacino, R., Passante, R., Rizzuto, L., Spagnolo, S. Journal of Physics: Conference Series, 880, IOP Publishing, Bristol, 2017 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Electrolyte solutions at curved electrodes. I. Mesoscopic approach Reindl, A., Bier, M., Dietrich, S. The Journal of Chemical Physics, 146(15):154703, American Institute of Physics, Woodbury, N.Y., 2017 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Electrolyte solutions at curved electrodes. II. Microscopic approach Reindl, A., Bier, M., Dietrich, S. The Journal of Chemical Physics, 146(15):154704, American Institute of Physics, Woodbury, N.Y., 2017 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Bachelor Thesis Electrostatic interaction between non-identical charged particles at an electrolyte interface Schmetzer, T. Universität Stuttgart, Stuttgart, 2017 BibTeX

Modern Magnetic Systems Theory of Inhomogeneous Condensed Matter Article Facile fabrication of mesoporous silica micro-jets with multi-functionalities Vilela, D., Hortelao, A. C., Balderas-Xicohténcatl, R., Hirscher, M., Hahn, K., Ma, X., Sánchez, S. Nanoscale, 9(37):13990-13997, Royal Society of Chemistry, Cambridge, UK, 2017 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Fluctuation induced forces in critical films with disorder at their surfaces Maciolek, A., Vasilyev, O., Dotsenko, V., Dietrich, S. Journal of Statistical Mechanics: Theory and Experiment, 2017(11):113203, Institute of Physics Publishing, Bristol, England, 2017 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Forward-backward multiplicity correlations in proton-proton collisions from several GeV to LHC energies Bravina, L., Bleibel, J., Emaus, R., Zabrodin, E. EPJ Web of Conferences, 164, EDP Sciences, Les Ulis, 2017 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Heat radiation and transfer for point particles in arbitrary geometries Asheichyk, K., Müller, B., Krüger, M. Physical Review B, 96(15):155402, American Physical Society, Woodbury, NY, 2017 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Master Thesis Interfacial structure of a catalytic surface Lipp, M. Universität Stuttgart, Stuttgart, 2017 BibTeX

Theory of Inhomogeneous Condensed Matter Article Key-lock colloids in a nematic liquid crystal Silvestre, N. M., Tasinkevych, M. Physical Review E, 95(1), American Physical Society, Melville, NY, 2017 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Liquid bridging of cylindrical colloids in near-critical solvents Labbe-Laurent, M., Law, A. D., Dietrich, S. The Journal of Chemical Physics, 147(10):104701, American Institute of Physics, Woodbury, N.Y., 2017 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Many-body heat radiation and heat transfer in the presence of a nonabsorbing background medium Müller, B., Incardone, R., Antezza, M., Emig, T., Krüger, M. Physical Review B, 95(8), American Physical Society, Woodbury, NY, 2017 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Measurement of second-order response without perturbation Helden, L., Basu, U., Krüger, M., Bechinger, C. EPL, 116(6), IOP Publishing, Bristol, 2017 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Mesoscopic Correlation Functions in Heterogeneous Ionic Liquids Weiss, H., Mars, J., Li, H., Kircher, G., Ivanova, O., Feoktystov, A., Soltwedel, O., Bier, M., Mezger, M. The Journal of Physical Chemistry B, 121(3):620-629, American Chemical Society, Washington, D.C., 2017 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Microbots Decorated with Silver Nanoparticles Kill Bacteria in Aqueous Media Vilela, D., Stanton, M. M., Parmar, J., Sánchez, S. ACS Applied Materials and Interfaces, 9(27):22093-22100, American Chemical Society, Washington, DC, 2017 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Master Thesis Microscopic investigation of the Marangoni effect Pöhnl, M. Universität Stuttgart, Stuttgart, 2017 BibTeX

Theory of Inhomogeneous Condensed Matter Article Model microswimmers in channels with varying cross section Malgaretti, P., Stark, H. The Journal of Chemical Physics, 146(17):174901, American Institute of Physics, Woodbury, N.Y., 2017 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Nematic films at chemically structured surfaces Silvestre, N. M., Telo da Gama, M. M., Tasinkevych, M. Journal of Physics: Condensed Matter, 29(7), IOP Publishing, Bristol, 2017 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Bachelor Thesis Non-equilibrium forces after temperature quenches in ideal fluids with conserved density Hölzl, C. Universität Stuttgart, Stuttgart, 2017 BibTeX

Theory of Inhomogeneous Condensed Matter Article Nonadditive interactions and phase transitions in strongly confined colloidal systems Vasilyev, O., Dietrich, S., Kondrat, S. Soft Matter, 14(4):586-596, Royal Society of Chemistry, Cambridge, UK, 2017 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Nonequilibrium Fluctuational Quantum Electrodynamics: Heat Radiation, Heat Transfer, and Force Bimonte, G., Emig, T., Kardar, M., Krüger, M. Annual Review of Condensed Matter Physics, 8:119-143, 2017 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Master Thesis Numerical studies of active colloids at fluid interfaces Peter, T. Universität Stuttgart, Stuttgart, 2017 BibTeX

Theory of Inhomogeneous Condensed Matter Article Onset of anomalous diffusion in colloids confined to quasimonolayers Bleibel, J., Dominguez, A., Oettel, M. Physical Review E, 95, American Physical Society, Melville, NY, 2017 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Particles with nonlinear electric response: Suppressing van der Waals forces by an external field Soo, H., Dean, D. S., Krüger, M. Physical Review E, 95(1), American Physical Society, Melville, NY, 2017 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Perils of ad hoc approximations for the activity function of chemically powered colloids Popescu, M. N., Uspal, W. E., Tasinkevych, M., Dietrich, S. The European Physical Journal E, 40(4):42, EDP Sciences; Società Italiana di Fisica; Springer, Les Ulis; Bologna; Heidelberg, 2017 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Platinum-free cobalt ferrite based micromotors for antibiotic removal Parmar, J., Villa, K., Vilela, D., Sánchez, S. Applied Materials Today, 9:605-611, Elsevier, Amsterdam, 2017 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Pushing Bacterial Biohybrids to In Vivo Applications Stanton, M. M., Sánchez, S. Trends in Biotechnology, 35(10):910-913, Elsevier Current Trends, Amsterdam, Netherlands, 2017 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Rotational motion of dimers of Janus particles Majee, A. European Physical Journal E, 40(3), Springer, Berlin, 2017 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Salt-induced microheterogeneities in binary liquid mixtures Bier, M., Mars, J., Li, H., Mezger, M. Physical Review E, 96(2):022603, American Physical Society, Melville, NY, 2017 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Master Thesis Self-diffusion of DNA grafted functional colloids in a crowded environment Werner, M. Universität Stuttgart, Stuttgart, 2017 BibTeX

Theory of Inhomogeneous Condensed Matter Article Self-propelling micro-nanorobots: challenges and fututre perspectives in nanomedicine Ma, X., Sánchez, S. Nanomedicine, 12(12):1363-1367, Future Medicine Ltd, London, UK, 2017 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Sign change in the net force in sphere-plate and sphere-sphere systems immersed in nonpolar critical fluid due to the interplay between the critical Casimir and dispersion van der Waals forces Valchev, G., Dantchev, D. Physical Review E, 96(2), American Physical Society, Melville, NY, 2017 DOI BibTeX

Theory of Inhomogeneous Condensed Matter Article Smectic phases in ionic liquid crystals Bartsch, H., Bier, M., Dietrich, S. Journal of Physics: Condensed Matter, 29(46):464002, IOP Publishing, Bristol, 2017 DOI BibTeX

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