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Acoustodynamic mass determination: Accounting for inertial effects in acoustic levitation of granular materials
Mia C. Morrell, David G. Grier
Acoustic traps use forces exerted by sound waves to confine and transport small objects. The dynamics of an object moving in the force landscape of an acoustic trap can be signific…
Anomalous tumbling of colloidal ellipsoids in Poiseuille flows
Lauren E. Altman, Andrew D. Hollingsworth, David G. Grier
Shear flows cause aspherical colloidal particles to tumble so that their orientations trace out complex trajectories known as Jeffery orbits. The Jeffery orbit of a prolate ellipso…
Multi-angle holographic characterization of individual fractal aggregates
Rafe Abdulali, Lauren E. Altman, David G. Grier
Holographic particle characterization uses quantitative analysis of holographic microscopy data to precisely and rapidly measure the diameter and refractive index of individual col…
Ultrasonic chaining of emulsion droplets
Mohammed A. Abdelaziz, Jairo A. Diaz, Jean-Luc Aider +3
Emulsion droplets trapped in an ultrasonic levitator behave in two ways that solid spheres do not: (1) Individual droplets spin rapidly about an axis parallel to the trapping plane…
Holographic characterization and tracking of colloidal dimers in the effective-sphere approximation
Lauren E. Altman, Rushna Quddus, Fook Chiong Cheong +1
An in-line hologram of a colloidal sphere can be analyzed with the Lorenz-Mie theory of light scattering to measure the sphere's three-dimensional position with nanometer-scale pre…
Dynamics of an acoustically trapped sphere in beating sound waves
Mohammed A. Abdelaziz, David G. Grier
A focused acoustic standing wave creates a Hookean potential well for a small sphere and can levitate it stably against gravity. Exposing the trapped sphere to a second transverse…