Spreading of a mercury droplet on thin gold films

Avraham Be'er, Yossi Lereah, Aviad Frydman, Haim Taitelbaum

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The spreading of a small mercury droplet (150 μm) on thin gold films is studied, using an optical microscope enhanced with a differential interference contrast system. The growing interfaces are analyzed in order to determine the roughness (α) and growth (β) exponents. For gold film thickness of 1500 Å we find that α = 0.88 ± 0.03 and β = 0.76 ± 0.03, while for gold thickness of 3000 Å, α = 0.96 ± 0.04 and β = 1.00 ± 0.04. Both sets of exponents satisfy the scaling relation α + α/β = 2. In both systems the roughness exponent α crosses over to a value close to 0.5 in the final stages of the experiment and for relatively long length scales (order of a few microns).

Original languageEnglish
Pages (from-to)325-330
Number of pages6
JournalPhysica A: Statistical Mechanics and its Applications
Issue number1-4
StatePublished - 2002

Bibliographical note

Funding Information:
This research was supported by The Israel Science Foundation (HT 580/98, AF 9041/99), and is part of the Ph.D. thesis of A. Be'er.


  • Diffusion
  • Reaction
  • Surface growth
  • Thin films


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