Pattern Formation in Vertically Vibrated Nails
in Vertically Vibrated Nails
M.Sc. report, unpublished, Sept. 2010.
T. Lynn MacDonald
Department of Physics,
University of Toronto,
60 St. George St., Toronto, Ontario, Canada M5S 1A7.
We report the experimental observation of pattern formation in vertically vibrated nails.
Phase diagrams are drawn as a function of packing fraction and signal generator driving
voltage for two different aspect ratios. Aspect ratio is shown to affect the states of order
observed in the system. We investigate the behaviour of patterns in nails with head-tail
orientation in full layers at 100% packing fraction as the driving voltage is increased in
increments over time. Calculations of nematic and antiferromagnetic order parameters
from data derived using manual and semi-automated nail detection from images taken
as a function of driving voltage and time are performed.
- Movie: melting a crystal of nails [YouTube].
- Movie: melting a crystal of nails [Flickr].
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