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Measuring single-nanoparticle wetting properties by freeze-fracture shadow-casting cryo-scanning electron microscopy
A novel in situ method is presented, on the basis of freeze-fracture shadow-casting cryo-scanning electron microscopy, that allows the measurement of contact angles of individual nanoparticles with 10 nm diameter, and thus greatly surpasses the current state of the art. Expand
Quantitative imaging of colloidal flows.
Two new algorithms for reliable particle tracking in non-uniform flows to the level of accuracy already available for quiescent systems are proposed. Expand
PEG-stabilized core-shell nanoparticles: impact of linear versus dendritic polymer shell architecture on colloidal properties and the reversibility of temperature-induced aggregation.
This new class of dendritically stabilized NPs is believed to have a potential for future biomedical and other applications, in which stability, resistance to (or reversible) aggregation, ultrasmall size (for crossing biological barriers or inclusion in responsive artificial membranes), and/or high corona density of (bio)active ligands are key. Expand
Microscopic mechanism for shear thickening of non-Brownian suspensions.
A simple model is proposed that links the transition from continuous to discontinuous shear thickening in dense granular pastes to distinct lubrication regimes in the particle contacts and shows that the suspension's volume fraction and the boundary lubrication friction coefficient control the nature of the shear-thickening transition. Expand
Thermal-lensing measurement of particle thermophoresis in aqueous dispersions
We show that thermophoresis (particle drift driven by thermal gradients) in aqueous solutions can be measured by using an all-optical thermal-lensing setup, where a temperature gradient is set by aExpand
Shear zones and wall slip in the capillary flow of concentrated colloidal suspensions.
The flow of a nearly random close packed, hard-sphere colloidal suspension (a "paste") in a square capillary using confocal microscopy shows that the velocity profiles can be captured by a theory of stress fluctuations originally developed for chute flow of dry granular media. Expand
Unraveling the 3D localization and deformation of responsive microgels at oil/water interfaces: a step forward in understanding soft emulsion stabilizers.
The unexpected absence of size and vertical position changes as a function of pH at liquid interfaces is reported and interpreted using simple arguments that link the particle interfacial activity, solvation, and internal deformation. Expand
Particle lithography from colloidal self-assembly at liquid-liquid interfaces.
A simple, scalable, single-step particle lithographic process that employs colloidal self-assembly at liquid-liquid interfaces (SALI) to fabricate regular, open particle lithography masks, where the size of the features and their separation can be independently controlled between 3 and 10 particle diameters is presented. Expand
Slip and flow of hard-sphere colloidal glasses.
Study of the flow of concentrated hard-sphere colloidal suspensions along smooth, nonstick walls using cone-plate rheometry and simultaneous confocal microscopy reveals both the "solid" microstructure during full slip and the local nature of the "slip to shear" transition. Expand
Adsorption of microgels at an oil-water interface: correlation between packing and 2D elasticity.
A route to easily control a posteriori the microgel packing at the surface of droplets and the flow properties of emulsions stabilised by the microgels is proposed. Expand