127 citations · 318 across the 8 of their papers we have counts for
4 papers · 1 filter
Acoustic measurement of a granular density of modes
Eli T. Owens, Karen E. Daniels
In glasses and other disordered materials, measurements of the vibrational density of states reveal that an excess number of long-wavelength (low-frequency) modes, as compared to t…
Flow-Driven Formation of Solid-like Microsphere Heaps
Carlos P. Ortiz, Robert Riehn, Karen E. Daniels
We observe the formation of heaps of repulsive microspheres, created by flowing a colloidal microsphere suspension towards a flat-topped ridge placed within a quasi two-dimensional…
Instabilities in droplets spreading on gels
Karen E. Daniels, Shomeek Mukhopadhyay, Paul J. Houseworth +1
We report a novel surface-tension driven instability observed for droplets spreading on a compliant substrate. When a droplet is released on the surface of an agar gel, it forms ar…
Characterization of a Freezing/Melting Transition in a Vibrated and Sheared Granular Medium
Karen E. Daniels, Robert P. Behringer
We describe experiments on monodisperse spherical particles in an annular cell geometry, vibrated from below and sheared from above. This system shows a freezing/melting transition…