255 citations · 1.5k across the 27 of their papers we have counts for
28 papers
Electric Fields in Liquid Water Irradiated with Protons at Ultrahigh Dose Rates
F. Gobet, P. Barberet, M. -H. Delville +8
We study the effects of irradiating water with 3 MeV protons at high doses by observing the motion of charged polystyrene beads outside the proton beam. By single-particle tracking…
Electroviscous drag on squeezing motion in sphere-plane geometry
Marcela Rodriguez Matus, Zaicheng Zhang, Zouhir Benrahla +3
Theoretically and experimentally, we study electroviscous phenomena resulting from charge-flow coupling in a nanoscale capillary. Our theoretical approach relies on Poisson-Boltzma…
Near-field probe of thermal capillary fluctuations of a hemispherical bubble
Zaicheng Zhang, Yuliang Wang, Yacine Amarouchene +4
We report measurements of resonant thermal capillary oscillations of a hemispherical liquid gas interface obtained using a half bubble deposited on a solid substrate. The thermal m…
Motion and trapping of micro- and millimeter-sized particles on the air-paramagnetic-liquid interface
Zoran Cenev, Alois Würger, Quan Zhou
Understanding the motion of particles on an air-liquid interface can impact a wide range of scientific fields and applications. Diamagnetic particles floating on an air-paramagneti…
Hydrodynamic interaction of a self-propelling particle with a wall: Comparison between an active Janus particle and a squirmer model
Zaiyi Shen, Alois Würger, Juho S. Lintuvuori
Using lattice Boltzmann simulations we study the hydrodynamics of an active spherical particle near a no-slip wall. We develop a computational model for an active Janus particle, b…
Hydrodynamics defines the stable swimming direction of spherical squirmers in a nematic liquid crystal
Juho S. Lintuvuori, Alois Würger, Kevin Stratford
We present a study of the hydrodynamics of an active particle, a model squirmer, in an envi- ronment with a broken rotational symmetry: a nematic liquid crystal. By combining simul…
Nanoscale Seebeck effect at hot metal nanostructures
Aboubakry Ly, Arghya Majee, Alois Würger
We theoretically study the electrolyte Seebeck effect in the vicinity of a heated metal nanostructure, such as the cap of an active Janus colloid in an electrolyte, or gold- coated…
Trapping of Single Nano-Objects in Dynamic Temperature Fields
Marco Braun, Alois Würger, Frank Cichos
In this article we explore the dynamics of a Brownian particle in a feedback-free dynamic thermophoretic trap. The trap contains a focused laser beam heating a circular gold struct…
Thermo-osmotic flow in thin films
Andreas Bregulla, Alois Würger, Katrin Günther +2
We report on the first micro-scale observation of the velocity field imposed by a non-uniform heat content along the solid/liquid boundary. We determine both radial and vertical ve…
Do thermal diffusion and Dufour coefficients satisfy Onsager's reciprocity relation?
Alois Würger
It is commonly admitted that in liquids the thermal diffusion and Dufour coefficients \ and satisfy Onsager's reciprocity. From their relation to the cross-coefficie…
Comment on "Curvature capillary migration of microspheres" by N. Sharifi-Mood, I.B. Liu, K.J. Stebe, Soft Matter 11, 6768 (2015), arXiv:1502.01672
Alois Würger
In a recent paper, Sharifi-Mood et al. study colloidal particles trapped at a liquid interface with opposite principal curvatures . In the theory part, they claim tha…
Hydrodynamic boundary effects on thermophoresis of confined colloids
Alois Würger
We study hydrodynamic slowing-down of a particle moving in a temperature gradient perpendicular to a wall. At distances much smaller than the particle radius, , lubrication…
Polarization of active Janus particles
Thomas Bickel, Guillermo Zecua, Alois Würger
We study the collective motion of Janus particles in a temperature or concentration gradient. Because of the torque exerted by an external or self-generated field, the particles al…
Trapping energy of a spherical particle on a curved liquid interface
Joseph Léandri, Alois Würger
We derive the trapping energy of a colloidal particle at a liquid interface with contact angle h and principal curvatures c1 and c2. The boundary conditions at the particle surface…
Collective thermoelectrophoresis of charged colloids
Arghya Majee, Alois Würger
Thermally driven colloidal transport is, to a large extent, due to the thermoelectric or Seebeck effect of the charged solution.We show that, contrary to the generally adopted sing…
Thermodiffusion in binary liquids: the role of irreversibility
Alois Würger
We study thermal diffusion in binary mixtures in the framework of non-equilibrium thermodynamics. Our formal result displays the role of partial enthalpies and Onsager's generalize…
Stokes-Einstein diffusion of colloids in nematics
Frédéric Mondiot, Jean-Christophe Loudet, Olivier Mondain-Monval +3
We report the experimental observation of anisotropic diffusion of polystyrene particles immersed in a lyotropic liquid crystal with two different anchoring conditions. Diffusion i…
Leidenfrost Gas Ratchets Driven by Thermal Creep
Alois Würger
We show that thermal creep is at the origin of the recently discovered Leidenfrost ratchet, where liquid droplets float on a vapor layer along a heated sawtooth surface and acceler…
Transport in Charged Colloids Driven by Thermoelectricity
Alois Würger
We study the thermal diffusion coefficient DT of a charged colloid in a temperature gradient, and find that it is to a large extent determined by the thermoelectric response of the…
Charging of Heated Colloidal Particles Using the Electrolyte Seebeck Effect
Arghya Majee, Alois Würger
We propose a novel actuation mechanism for colloids, which is based on the Seebeck effect of the electrolyte solution: Laser heating of a nonionic particle accumulates in its vicin…
Flow pattern in the vicinity of self-propelling hot Janus particles
Thomas Bickel, Arghya Majee, Alois Würger
We study the temperature field and the resulting flow pattern in the vicinity of a heated metal-capped Janus particle. If its thickness exceeds about 10 nm, the cap forms an isothe…
Specific Salt Effects on Thermophoresis of Charged Colloids
Kyriakos A. Eslahian, Arghya Majee, Michael Maskos +1
We study the Soret effect of charged polystyrene particles as a function of temperature and electrolyte composition. As a main result we find that the Soret coefficient is determin…
Thermophoresis of charged colloidal particles
S. Fayolle, T. Bickel, A. Würger
Thermally induced particle flow in a charged colloidal suspension is studied in a fluid-mechanical approach. The force density acting on the charged boundary layer is derived in de…
Electric-field induced capillary interaction of charged particles at a polar interface
Lionel Foret, Alois Würger
We study the electric-field induced capillary interaction of charged particles at a polar interface. The algebraic tails of the electrostatic pressure of each charge results in a d…