# Difference between revisions of "Ordered clusters and dynamical states of particles in a vibrated fluid"

Original entry: Hsin-I Lu, APPHY 225, Fall 2009

"Ordered clusters and dynamical states of particles in a vibrated fluid"

Greg A. Voth, B. Bigger, M. R. Buckley, W. Losert, M. P. Brenner, H. A. Stone, and J. P. Gollub, PRL 88, 234301 (2002)

## Summary

This paper studied the clustering and dynamical states of small stainless steel spheres when they were vibrated in fluid. The long-range attractive interaction and short-range repulsive interaction between particles are fluid mediated. The resulting patterns include hexagonally ordered microcrystallites, time-periodic structures, and chaotic fluctuating patterns with complex dynamics.

## Soft Matter Keywords

Interstitial fluid, self-assembly, viscosity, ordered clusters, microcrystallites

## Soft Matter

Fig. 1
Fig. 2
• Experiment:

Fig. 1 shows the experimental setup. A submonolayer of uniform stainless steel spheres together with a water/glycerol mixture are sealed inside an aluminum container vibrated vertically by an electromagnetic vibrator. Both the frequency ($v=2\pi f$) and amplitude ($S$) of the vibration of the container are controlled externally. The entire system is imaged from above by a fast CCD camera. Fig. 2