Publications (14)
Three-body interactions in colloidal systems
J. Dobnikar, M. Brunner, H. H. von Grünberg +1
We present the first direct measurement of three-body interactions in a colloidal system comprised of three charged colloidal particles. Two of the particles have been confined by…
The Einstein relation generalized to non-equilibrium
V. Blickle, T. Speck, C. Lutz +2
The Einstein relation connecting the diffusion constant and the mobility is violated beyond the linear response regime. For a colloidal particle driven along a periodic potential i…
Criticality and phase separation in a two-dimensional binary colloidal fluid induced by the solvent critical behavior
O. Zvyagolskaya, A. J. Archer, C. Bechinger
We present an experimental and theoretical study of the phase behavior of a binary mixture of colloids with opposite adsorption preferences in a critical solvent. As a result of th…
Understanding depletion forces beyond entropy
C. Bechinger, D. Rudhardt, P. Leiderer +2
The effective interaction energy of a colloidal sphere in a suspension containing small amounts of non-ionic polymers and a flat glass surface has been measured and calculated usin…
Thermodynamics of a Colloidal Particle in a Time-Dependent Non-Harmonic Potential
V. Blickle, T. Speck, L. Helden +2
We study the motion of an overdamped colloidal particle in a time-dependent non-harmonic potential. We demonstrate the first law-like balance between applied work, exchanged heat,…
Direct measurement of three-body interactions
M. Brunner, J. Dobnikar, H. H. von Grünberg +1
Three-body interactions have been measured among three charged colloidal particles in deionized solvent. Two of the particles have been confined to an optical line-trap while the t…
Characterizing Potentials by a Generalized Boltzmann Factor
V. Blickle, T. Speck, U. Seifert +1
Based on the concept of a nonequilibrium steady state, we present a novel method to experimentally determine energy landscapes acting on colloidal systems. By measuring the station…
Proliferation of anomalous symmetries in colloidal monolayers subjected to quasiperiodic light fields
J. Mikhael, M. Schmiedeberg, S. Rausch +3
Quasicrystals provide a fascinating class of materials with intriguing properties. Despite a strong potential for numerous technical applications, the conditions under which quasic…
Experimental observation of the Aubry transition in two-dimensional colloidal monolayers
T. Brazda, A. Silva, N. Manini +4
The possibility to achieve entirely frictionless, i.e. superlubric, sliding between solids, holds enormous potential for the operation of mechanical devices. At small length scales…
Critical Casimir effect in classical binary liquid mixtures
A. Gambassi, A. Maciolek, C. Hertlein +4
If a fluctuating medium is confined, the ensuing perturbation of its fluctuation spectrum generates Casimir-like effective forces acting on its confining surfaces. Near a continuou…
Distribution of Entropy Production for a Colloidal Particle in a Nonequilibrium Steady State
T. Speck, V. Blickle, C. Bechinger +1
For a colloidal particle driven by a constant force across a periodic potential, we investigate the distribution of entropy production both experimentally and theoretically. For sh…
Critical Casimir forces in colloidal suspensions on chemically patterned surfaces
F. Soyka, O. Zvyagolskaya, C. Hertlein +2
We investigate the behavior of colloidal particles immersed in a binary liquid mixture of water and 2,6-lutidine in the presence of a chemically patterned substrate. Close to the c…
Three- and four-body interactions in colloidal systems
J. Dobnikar, M. Brunner, Jörg Baumgartl +2
Three-body and four-body interactions have been directly measured in a colloidal system comprised of three (or four) charged colloidal particles. Two of the particles have been con…
Measuring the equation of state of a hard-disc fluid
M. Brunner, C. Bechinger, U. Herz +1
We use video microscopy to study a two-dimensional (2D) model fluid of charged colloidal particles suspended in water and compute the pressure from the measured particle configurat…