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Direct measurement of critical Casimir forces
The direct measurement of critical Casimir force is reported between a single colloidal sphere and a flat silica surface immersed in a mixture of water and 2,6-lutidine near its critical point, which may result in novel uses of colloids as model systems.
Line tension between fluid phases and a substrate
We calculate the density distribution of a three-phase contact between the liquid-vapor interface of a simple fluid and a planar substrate. Using a microscopic density functional theory we pay
Conceptual aspects of line tensions.
The formulation provides a clearly defined scheme to determine line properties from measured dependences of the contact angles on lens or drop volumes and shows how these coefficients transform as a function of the relative displacements of the dividing interfaces.
Colloidal interactions at fluid interfaces.
We discuss qualitative and quantitative aspects of the effective interactions between micrometer-sized colloids of different types trapped at fluid interfaces, with a particular emphasis on the
Critical Casimir effect in classical binary liquid mixtures.
This work reports on the direct measurement of critical Casimir forces by total internal reflection microscopy with femtonewton resolution and provides the corresponding theoretical predictions for the sphere-planar wall geometry of the experiment.
Universal scaling functions of critical Casimir forces obtained by Monte Carlo simulations.
Effective Casimir forces induced by thermal fluctuations in the vicinity of bulk critical points are studied by means of Monte Carlo simulations in three-dimensional systems for film geometries and
Self-propulsion of a catalytically active particle near a planar wall: from reflection to sliding and hovering.
This work predicts that near a hard planar wall such a Janus particle exhibits several scenarios of motion, and proposes that a desired behavior can be selected by tuning these parameters via a judicious design of the particle surface chemistry.
Effective Hamiltonian for liquid-vapor interfaces.
An effective Hamiltonian for liquid-vapor interfaces of simple fluids is derived which goes beyond the common phenomenological capillary-wave description and takes into account the long-ranged power-law decay of the dispersion forces between the fluid particles.
Polymer depletion effects near mesoscopic particles.
The results corroborate the validity of the Helfrich-type curvature expansion for general particle shapes and allow for quantitative experimental tests.
Filling transition for a wedge.
A filling transition is found at which the height of the meniscus becomes macroscopically large while the planar walls of the wedge far away from its center remain nonwet up to the wetting transition occurring at Tw>Tphi.