Generation of hierarchical micro-structures for anisotropic wetting by elliptical vibration cutting

Ping Guo, Yong Lu, Kornel F. Ehmann, Jian Cao*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

80 Scopus citations


This paper reports enhanced anisotropic wettability using two-level hierarchical micro-structures. First-order micro-channels with superimposed second-order micro-textures were machined on aluminum surfaces using ultrasonic elliptical vibration cutting (EVC). Controllable sinusoidal micro-textures with a wavelength one order of magnitude smaller than the widths of the first-order micro-channels were applied to the surface. Anisotropic wettability was evaluated by water contact angle measurements in two orthogonal directions. The results have shown that the generated hierarchical micro-structures have nearly doubled the anisotropic contact angle in comparison to one-level structures. A relationship between anisotropic wetting characteristics and process parameters is also presented.

Original languageEnglish (US)
Pages (from-to)553-556
Number of pages4
JournalCIRP Annals - Manufacturing Technology
Issue number1
StatePublished - 2014


  • Anisotropic wetting
  • Micro machining
  • Surface modification

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering


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