Dynamic Capillary Assembly Of Colloids At Interfaces With 10 000g Here we probe and visualise the evolution of a monolayer of colloids confined at a bubble surface during high rate deformation driven by ultrasound. Here we use a two dimensional model system, a monolayer of colloids confined at a fluid interface, to probe and visualise the evolution of the microstructure during high rate deformation driven.
Pdf Dynamic Capillary Assembly Of Colloids At Interfaces With 10 000g We observe the emergence of a transient network of strings, and use discrete particle simulations to show that it is caused by a delicate interplay of dynamic capillarity and hydrodynamic interactions between particles oscillating at high frequency. Here we probe and visualise the evolution of a monolayer of colloids confined at a bubble surface during high rate deformation driven by ultrasound. A simpli ed force balance on a sphere attached to the interface by capillary forces, and undergoing oscillations normal to the interface, reveals that the inertia of the particle is important for a micron sized colloid at the extreme accelerations in our experiments, approaching 10;000g. Huerre et al. examine the self assembly of colloids confined at a fluid interface driven by ultrasound and show the formation of string like microstructures caused by dynamic capillarity.
Capillary And Hydrodynamic Effects On Particles At An Oscillating A simpli ed force balance on a sphere attached to the interface by capillary forces, and undergoing oscillations normal to the interface, reveals that the inertia of the particle is important for a micron sized colloid at the extreme accelerations in our experiments, approaching 10;000g. Huerre et al. examine the self assembly of colloids confined at a fluid interface driven by ultrasound and show the formation of string like microstructures caused by dynamic capillarity. To impart controlled, dynamic compression of a particle laden interface, and ac cess the far from equilibrium behaviour of the colloid monolayer, we subject particle coated bubbles to ultrasonic driving. We observe the emergence of a transient network of strings, and use discrete particle simulations to show that it is caused by a delicate interplay of dynamic capillarity and hydrodynamic interactions between particles oscillating at high frequency. Remarkably for a colloidal system, we find evidence of inertial effects, caused by accelerations approaching 10,000g. these results also suggest that extreme deformation of soft matter offers new opportunities for pattern formation and dynamic self assembly. Project description: the unique behavior of colloids at liquid interfaces provides exciting opportunities for engineering the assembly of colloidal particles into functional materials.
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