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2014


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Finite-size scaling study of shear viscosity anomaly at liquid-liquid criticality

Roy, S., Das, S. K.

The Journal of Chemical Physics, 141(23), December 2014 (article)

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DOI [BibTex]

2014


DOI [BibTex]


{Detecting magnetic flux distributions in superconductors with polarized x-rays}
Detecting magnetic flux distributions in superconductors with polarized x-rays

Stahl, C., Audehm, P., Gräfe, J., Ruoß, S., Weigand, M., Schmidt, M., Treiber, S., Bechtel, M., Goering, E., Schütz, G., Albrecht, J.

{Physical Review B}, 90(10), American Physical Society, Woodbury, NY, 2014 (article)

Abstract
The magnetic flux distribution arising from a high-Tc superconductor is detected and visualized using polarized x rays. Therefore, we introduce a sensor layer, namely, an amorphous, soft-magnetic Co40Fe40B20 cover layer, providing a large x-ray magnetic circular dichroism (XMCD). Temperature-dependent XMCD spectroscopy on the magnetic layer has been performed. Exploiting the temperature dependence of the critical current density of the superconductor we find a quantitative correlation between the XMCD signal and the in-plane stray field of the superconductor. Magneto-optical Kerr effect experiments on the sensor layer can simulate the stray field of the superconductor and hence verify the correlation. We show that the XMCD contrast in the sensor layer corresponds to the in-plane magnetic flux distribution of the superconductor and can hence be used to image magnetic structures in superconductors.

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DOI [BibTex]

DOI [BibTex]


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Ultracompact Three-Dimensional Tubular Conductivity Microsensors for Ionic and Biosensing Applications

Martinez-Cisneros, C. S., Sanchez, S., Schmidt, O. G., Xi, W.

Nano Letters, pages: 2219-2224, American Chemical Society, Washington, DC, 2014 (article)

Abstract
We present ultracompact three-dimensional tubular structures integrating Au-based electrodes as impedimetric microsensors for the in-flow determination of mono- and divalent ionic species and HeLa cells. The microsensors show an improved performance of 2 orders of magnitude (limit of detection \textequals 0.1 nM for KCl) compared to conventional planar conductivity detection systems integrated in microfluidic platforms and the capability to detect single HeLa cells in flowing phosphate buffered saline. These highly integrated conductivity tubular sensors thus open new possibilities for lab-in-a-tube devices for bioapplications such as biosensing and bioelectronics.

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DOI [BibTex]

DOI [BibTex]


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Catalytic nanomotors for environmental monitoring and water remediation

Soler, L., Sanchez, S.

Nanoscale, 6(13):7175-7182, 2014 (article)

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DOI [BibTex]

DOI [BibTex]


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Proton-proton collisions at ultra-relativistic energies in quark-gluon string model

Bravina, L., Bleibel, J., Malinina, L., Nilsson, M. S., Zabrodin, E.

EPJ Web of Conferences, 70, EDP Sciences, Les Ulis, 2014 (article)

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DOI [BibTex]

DOI [BibTex]


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Hydrodynamic interactions induce anomalous diffusion under partial confinement

Bleibel, J., Dominguez, A., Günther, F., Harting, J., Oettel, M.

Soft Matter, 10(17):2945-2948, Royal Society of Chemistry, Cambridge, UK, 2014 (article)

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DOI [BibTex]

DOI [BibTex]


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Clay nanotube encapsulation for functional biocomposites

Lvov, Y., Aerov, Artem A., Aerov, A. A., Fakhrullin, R.

Advances in Colloid and Interface Science, 207, pages: 189-198, 2014 (article)

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DOI [BibTex]

DOI [BibTex]


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Control of Self-Propelled Microjets Inside a Microchannel With Time-Varying Flow Rates

Magdanz, V., Sanchez, S., Schmidt, O. G., Khalil, I. S. M., Misra, S.

IEEE Transactions on Robotics and Automation, pages: 49-58, IEEE, New York, NY, 2014 (article)

Abstract
We demonstrate the closed-loop motion control of self-propelled microjets inside a fluidic microchannel. The motion control of the microjets is achieved in hydrogen peroxide solution with time-varying flow rates, under the influence of the controlled magnetic fields and the self-propulsion force. Magnetic dipole mo- ment of the microjets is characterized using the U-turn and the rotating field techniques. The characterized magnetic dipole mo- ment has an average of 1.4 $\times$ 10 \textminus 13 A.m 2 at magnetic field, linear velocity, and boundary frequency of 2 mT, 100 $\mu$ m/s, and 25 rad/s, respectively. We implement a closed-loop control system that is based on the characterized magnetic dipole moment of the mi- crojets. This closed-loop control system positions the microjets by directing the magnetic field lines toward the reference position. Experiments are done using a magnetic system and a fluidic mi- crochannel with a width of 500 $\mu$ m. In the absence of a fluid flow, our control system positions the microjets at an average velocity and within an average region-of-convergence (ROC) of 119 $\mu$ m/s and 390 $\mu$ m, respectively. As a representative case, we observe that our control system positions the microjets at an average velocity and within an average ROC of 90 $\mu$ m/s and 600 $\mu$ m and 120 $\mu$ m/s and 600 $\mu$ m when a flow rate of 2.5 $\mu$ l/min is applied against and along the direction of the microjets, respectively. Furthermore, the average velocity and ROC are determined throughout the flow range (0 to 7.5 $\mu$ l/min) to characterize the motion of the microjets inside the microchannel

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DOI [BibTex]

DOI [BibTex]


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Electrostatic interaction between colloidal particles trapped at an electrolyte interface

Majee, A., Bier, M., Dietrich, S.

The Journal of Chemical Physics, 140(16), American Institute of Physics, Woodbury, N.Y., 2014 (article)

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DOI [BibTex]

DOI [BibTex]


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Capillary attraction induced collapse of colloidal monolayers at fluid interfaces

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

Soft Matter, 10(23):4091-4109, Royal Society of Chemistry, Cambridge, UK, 2014 (article)

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DOI [BibTex]

DOI [BibTex]


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Trapping self-propelled micromotors with microfabricated chevron and heart-shaped chips

Restrepo-Pérez, L., Soler, L., Mart\’\inez-Cisneros, C. S., Sanchez, S., Schmidt, O. G.

Lab on a Chip, 14(9):1515-1518, 2014 (article)

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DOI [BibTex]

DOI [BibTex]


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Order of wetting transitions in electrolyte solutions

Ibagon, I., Bier, M., Dietrich, S.

The Journal of Chemical Physics, 140(17), American Institute of Physics, Woodbury, N.Y., 2014 (article)

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DOI [BibTex]

DOI [BibTex]


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Specific salt effects on thermophoresis of charged colloids

Eslahian, K. A., Majee, A., Maskos, M., Würger, A.

Soft Matter, 10(12):1931-1936, 2014 (article)

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DOI [BibTex]

DOI [BibTex]


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H5MD: A structured, efficient, and portable file format for molecular data

De Buyl, P., Colberg, P. H., Höfling, F.

Computer Physics Communications, 185(6):1546-1553, 2014 (article)

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DOI [BibTex]

DOI [BibTex]


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Emergent Long-Range Couplings in Arrays of Fluid Cells

Abraham, D. B., Maciolek, A., Vasilyev, O.

Physical Review Letters, 113(7), American Physical Society, Woodbury, N.Y., 2014 (article)

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DOI [BibTex]

DOI [BibTex]


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Effective interaction between a colloid and a soft interface near criticality

Law, A. D., Harnau, L., Tröndle, M., Dietrich, S.

The Journal of Chemical Physics, 141(13), 2014 (article)

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DOI [BibTex]

DOI [BibTex]


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Photoactive rolled-up TiO2 microtubes: fabrition, characterization and applications

Giuducatti, S., Marz, S. M., Soler, L., Madani, A., Jorgensen, M. R., Sanchez, S., Schmidt, O. G.

Journal of Materials Chemistry C: Materials for Optical and Electronic Devices, pages: 5892-5901, Royal Society of Chemistry, London, UK, 2014 (article)

Abstract
Because of its unique properties, titania (TiO2) represents a promising candidate in a wide variety of research fields. In this paper, some of the properties and potential applications of titania within rolled-up nanotechnology are explored. It is shown how the structural and optical properties of rolled titania microtubes can be controlled by properly tuning the microfabrication parameters. The rolling up of titania films on different sacrificial layers and containing different shapes, achieving a control on the diameter of the fabricated titania microtubes, is presented. In order to obtain the more photoactive crystalline form of titania, one during-fabrication and two post-fabrication methods are demonstrated. Interesting applications in the fields of photocatalysis and photonics are suggested: the use of titania rolled-up microtubes as micromotors and optical microresonators is presented.

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DOI [BibTex]

DOI [BibTex]


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How ions in solution can change the sign of the critical Casimir potential

Pousaneh, F., Ciach, A., Maciolek, A.

Soft Matter, 10(3):470-483, Royal Society of Chemistry, Cambridge, UK, 2014 (article)

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DOI [BibTex]

DOI [BibTex]


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Critical Casimir interactions around the consolute point of a binary solvent

Mohry, T. F., Kondrat, S., Maciolek, A., Dietrich, S.

Soft Matter, 10(30):5510-5522, 2014 (article)

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DOI [BibTex]

DOI [BibTex]


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Collapse and reversibility of the superhydrophobic state on nanotextured surfaces

Checco, A., Ocko, B. M., Rahman, A., Black, C. T., Tasinkevych, M., Giacomello, A., Dietrich, S.

Physical Review Letters, 112(21), American Physical Society., Woodbury, N.Y., etc., 2014 (article)

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DOI [BibTex]

DOI [BibTex]


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Density functional theory of electrowetting

Bier, M., Ibagon, I.

Physical Review E, 89(4), American Physical Society, Melville, NY, 2014 (article)

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DOI [BibTex]

DOI [BibTex]


{Application of magneto-optical Kerr effect to first-order reversal curve measurements}
Application of magneto-optical Kerr effect to first-order reversal curve measurements

Gräfe, J., Schmidt, M., Audehm, P., Schütz, G., Goering, E.

{Review of Scientific Instruments}, 85, American Institute of Physics, Woodbury, N.Y. [etc.], 2014 (article)

Abstract
First-order reversal curves (FORC) are a powerful method for magnetic sample characterization, separating all magnetic states of an investigated system according to their coercivity and internal magnetic interactions. A major drawback of using measurement techniques like VSM or SQUID, typically applied for FORC acquisition, is the long measurement time, limiting the resolution and the number of measurements due to time constraints. Faster techniques like MOKE result in problems regarding measurement stability over the curse of the acquisition of many minor loops, due to drift and non-absolute magnetization values. Here, we present an approach using a specialized field shape providing two anchor points for each minor loop for applying the magneto-optical Kerr effect (MOKE) technique to FORC measurements. This results in a high field resolution while keeping the total acquisition time to only a few minutes. MOKE FORC measurements are exemplarily applied to a simple permalloy film, an exchange-bias system, and a Gd/Fe multilayer system with perpendicular magnetic anisotropy, showcasing the versatility of the method.

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DOI Project Page [BibTex]

DOI Project Page [BibTex]


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Alignment of cylindrical colloids near chemically patterned substrates induced by critical Casimir torques

Labbe-Laurent, M., Tröndle, M., Harnau, L., Dietrich, S.

Soft Matter, 10(13):2270-2291, Royal Society of Chemistry, Cambridge, UK, 2014 (article)

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DOI [BibTex]

DOI [BibTex]


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Heat transfer between anisotropic nanoparticles: Enhancement and switching

Incardone, R., Emig, T., Krüger, M.

Europhysics Letters, 106(4), 2014 (article)

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DOI [BibTex]

DOI [BibTex]


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Rolled-up Functionalized Nanomembranes as Three-Dimensional Cavities for Single Cell Studies

Xi, W., Schmidt, C., Sanchez, S., Gracias, D., Carazo-Salas, R., Jackson, S., Schmidt, O. G.

Nano Letters, 14(8):4197-4204, American Chemical Society, Washington, DC, 2014 (article)

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DOI [BibTex]

DOI [BibTex]


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Dispersions of ellipsoidal particles in a nematic liquid crystal

Tasinkevych, M., Mondiot, F., Mondain-Monval, O., Loudet, J. C.

Soft Matter, 10(12):2047-2058, Royal Society of Chemistry, Cambridge, UK, 2014 (article)

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DOI [BibTex]

DOI [BibTex]


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Critical Casimir interactions between spherical particles in the presence of bulk ordering fields

Vasilyev, O.

Physical Review E, 90, American Physical Society, Melville, NY, 2014 (article)

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DOI [BibTex]

DOI [BibTex]


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Towards Template-Assisted Assembly of Nematic Colloids

Silvestre, N. M., Liu, Q., Senyuk, B., Smalyukh, I. I., Tasinkevych, M.

Physical Review Letters, 112(22), American Physical Society, Woodbury, N.Y., 2014 (article)

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DOI [BibTex]

DOI [BibTex]


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Biocompatible, accurate, and fully autonomous: a sperm-driven micro-bio-robot

Khalil, I. S. M., Magdanz, V., Sanchez, S., Schmidt, O. G., Misra, S.

Journal of Micro-Bio Robotics, 9(3-4):79-86, 2014 (article)

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DOI [BibTex]

DOI [BibTex]


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Stimuli-Responsive Microjets with Reconfigurable Shape

Magdanz, V., Stoychev, G., Ionov, L., Sanchez, S., Schmidt, O. G.

Angewandte Chemie International Edition : a journal of the Gesellschaft Deutscher Chemiker, 53, pages: 2673-2677, Wiley-VCH, Weinheim, 2014 (article)

Abstract
Flexible thermoresponsive polymeric microjets are formed by the self-folding of polymeric layers containing a thin Pt film used as catalyst for self-propulsion in solutions containing hydrogen peroxide. The flexible microjets can reversibly fold and unfold in an accurate manner by applying changes in temperature to the solution in which they are immersed. This effect allows microjets to rapidly start and stop multiple times by controlling the radius of curvature of the microjet. This work opens many possibilities in the field of artificial nanodevices, for fundamental studies on self-propulsion at the microscale, and also for bio related applications.

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DOI [BibTex]

DOI [BibTex]


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Effect of surfactants on the performance of tubular and spherical micromotors –a comparative study

Simmchen, J., Magdanz, V., Sanchez, S., Chokmaviroj, S., Ruiz-Molina, D., Baeza, A., Schmidt, O. G.

RSC Advances, 4(39):20334-20340, Royal Society of Chemistry, Cambridge, UK, 2014 (article)

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DOI [BibTex]

DOI [BibTex]


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Rolled-up Functionalized Nanomembranes as Three-Dimensional Cavities for Single Cell Studies

Xi, W., Schmidt, C. K., Sanchez, S., Gracias, D. H., Carazo-Salas, R. E., Jackson, S. P., Schmidt, O. G.

Nano Letters, 14(2):4197-4204, American Chemical Society, Washington, DC, 2014 (article)

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DOI [BibTex]

DOI [BibTex]


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Wireless Magnetic-Based Closed-Loop Control of Self-Propelled Microjets

Khalil, I. S. M., Magdanz, V., Sanchez, S., Schmidt, O. G., Misra, S.

PLoS One, 9(2), Public Library of Science, San Francisco, CA, 2014 (article)

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DOI [BibTex]

DOI [BibTex]


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Topological Polymer Dispersed Liquid Crystals with Bulk Nematic Defect Lines Pinned to Handlebody Surfaces

Campbell, M. G., Tasinkevych, M., Smalyukh, I. I.

Physical Review Letters, 112(19), American Physical Society, Woodbury, N.Y., 2014 (article)

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DOI [BibTex]

DOI [BibTex]


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Periodic dynamics, localization metastability, and elastic interaction of colloidal particles with confining surfaces and helicoidal structure of cholesteric liquid crystals

Varney, M. C. M., Zhang, QX, Tasinkevych, M., Silvestre, N. M., Bertness, K. A., Smalyukh, I. I.

Physical Review E, 90(6), American Physical Society, Melville, NY, 2014 (article)

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DOI [BibTex]

DOI [BibTex]


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Efflorescence upon humidification? X-ray microspectroscopic in situ observation of changes in aerosol microstructure and phase state upon hydration

Pöhlker, C., Saturno, J., Krüger, M. L., Förster, J. D., Weigand, M., Wiedemann, K. T., Bechtel, M., Artaxo, P., Andreae, M. O.

{Geophysical Research Letters}, 41(10):3681-3689, American Geophysical Union, Washington, D.C., 2014 (article)

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DOI [BibTex]

DOI [BibTex]


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Investigation of cellular microstructure and enhanced coercivity in sputtered Sm2(CoCuFeZr)17 film

Bhatt, R., Bhatt, P., Schütz, G.

{Journal of Applied Physics}, 115(10), American Institute of Physics, New York, NY, 2014 (article)

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DOI [BibTex]

DOI [BibTex]


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Spatial degradation mapping and component-wise degradation tracking in polymer-fullerene blends

Pedersen, E. B. B., Tromholt, T., Madsen, M. V., Böttiger, A. P. L., Weigand, M., Krebs, F. C., Andreasen, J. W.

{Journal of Materials Chemistry C}, 2(26):5176-5182, Royal Society of Chemistry, Cambridge, UK, 2014 (article)

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DOI [BibTex]

DOI [BibTex]


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Vortex core reversal due to spin wave interference

Bauer, H. G., Sproll, M., Back, C. H., Woltersdorf, G.

{Physical Review Letters}, 112, American Physical Society, Woodbury, N.Y., 2014 (article)

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DOI [BibTex]

DOI [BibTex]


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Understanding the adsorption mechanism of noble gases Kr and Xe in CPO-27-Ni, CPO-27-Mg, and ZIF-8

Magdysyuk, O. V., Adams, F., Liermann, H., Spanopoulos, I., Trikalitis, P. N., Hirscher, M., Morris, R. E., Duncan, M. J., McCormick, L. J., Dinnebier, R. E.

{Physical Chemistry Chemical Physics}, 16(43):23908-23914, Royal Society of Chemistry, Cambridge, England, 2014 (article)

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DOI [BibTex]

DOI [BibTex]


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Unidirectional sub-100-ps magnetic vortex core reversal

Noske, M., Gangwar, A., Stoll, H., Kammerer, M., Sproll, M., Dieterle, G., Weigand, M., Fähnle, M., Woltersdorf, G., Back, C. H., Schütz, G.

{Physical Review B}, 90(10), American Physical Society, Woodbury, NY, 2014 (article)

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DOI [BibTex]

DOI [BibTex]


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Domain wall transformations and hopping in La0.7Sr0.3MnO3 nanostructures imaged with high resolution x-ray magnetic microscopy

Finizio, S., Foerster, M., Krüger, B., Vaz, C. A. F., Miyawaki, T., Mawass, M. A., Pena, L., Méchin, L., Hühn, S., Moshnyaga, V., Büttner, F., Bisig, A., Le Guyader, L., El Moussaoui, S., Valencia, S., Kronast, F., Eisebitt, S., Kläui, M.

{Journal of Physics: Condensed Matter}, 26(45), IOP Publishing, Bristol, 2014 (article)

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DOI [BibTex]

DOI [BibTex]


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Tunable eigenmodes of coupled magnetic vortex oscillators

Hänze, M., Adolff, C. F., Weigand, M., Meier, G.

{Applied Physics Letters}, 104(18), American Institute of Physics, Melville, NY, 2014 (article)

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DOI [BibTex]

DOI [BibTex]


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Domain wall pinning in ultra-narrow electromigrated break junctions

Reeve, R. M., Loescher, A., Mawass, M.-A., Hoffmann-Vogel, R., Kläui, M.

{Journal of Physics: Condensed Matter}, 26(47), IOP Publishing, Bristol, 2014 (article)

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DOI [BibTex]

DOI [BibTex]


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Highly effective hydrogen isotope separation in nanoporous metal-organic framworks with open metal sites: Direct measurement and theoretical analysis

Oh, H., Savchenko, I., Mavrandonakis, A., Heine, T., Hirscher, M.

{ACS Nano}, 8(1):761-770, American Chemical Society, Washington, DC, 2014 (article)

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DOI [BibTex]

DOI [BibTex]


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Stabilization of the dissipation-free current transport in inhomogeneous MgB2 thin films

Treiber, S., Stahl, C., Schütz, G., Soltan, S., Albrecht, J.

{Physica C}, 506, pages: 1-5, North-Holland, Amsterdam, 2014 (article)

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DOI [BibTex]

DOI [BibTex]


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Thermal conductivity of mechanically joined semiconducting/metal nanomembrane superlattices

Grimm, D., Wilson, R. B., Teshome, B., Gorantla, S., Rümmeli, M. H., Bublat, T., Zallo, E., Li, G., Cahill, D. G., Schmidt, O. G.

{Nano Letters}, 14(5):2387-2393, American Chemical Society, Washington, DC, 2014 (article)

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DOI [BibTex]

DOI [BibTex]


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Splitting, linking, knotting, and solitonic escape of topological defects in nematic drops with handles

Tasinkevych, M., Campbell, M. G., Smalyukh, I. I.

Proceedings of the National Academy of Sciences of the United States of America, 111(46):16268-16273, National Academy of Sciences, 2014 (article)

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DOI [BibTex]

DOI [BibTex]