Determination of macro-contact angle and line tension at high temperatures for Au/Al2O3 system at 1373 K using a micro-scale wetting method

Joonho Lee, Kazuki Morita, Toshihiro Tanaka

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

The size effect of a drop on the contact angle was discussed for the Au/Al2O3 system. As the size of the drop decreases, the shape of the drop closes to a sphere and the contact angle is obtained by the equation θ = cos-1 (1 - h/RMax.), where θ is the contact angle between the drop and substrates, h is the height of the drop and RMax. is the maximum radius of the drop. The contact angle between liquid gold and alumina polycrystalline substrates having the roughness of 0.141 μm in RA number slightly increased as the sample size decreases to about 10 μm, yielding 134° and 3.50 × 10-7 N as the macro-scale contact angle and the line tension, respectively.

Original languageEnglish
Pages (from-to)2659-2663
Number of pages5
JournalMaterials Transactions
Volume44
Issue number12
DOIs
Publication statusPublished - 2003 Dec

Keywords

  • Alloy
  • Contact angle
  • Laplace equation
  • Metal
  • Micro-wetting
  • Surface
  • Young's equation

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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