Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2004-08-22
Physics
Condensed Matter
Soft Condensed Matter
6 pages, 6 figures
Scientific paper
The roughness exponent of surfaces obtained by dispersing silica spheres into a quasi-two-dimensional cell is examined using experimental and computational methods. The cell consists of two glass plates separated by a gap, which is comparable in size to the diameter of the beads. We have studied the effect of changing the gap between the plates to a limit of about twice the diameter of the beads. If the conventional scaling analysis is performed, the roughness exponent is found to be robust against changes in the gap between the plates. The surfaces formed have two roughness exponents in two length scales, which have a crossover length about 1 cm.; however, the computational results do not show the same crossover behavior. The single exponent obtained from the simulations stays between the two roughness exponents obtained in the experiments.
Cardak U.
Kurnaz Mehmet Levent
McCloud K. V.
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