Experimental study of dynamic contact angles on rough hydrophobic surfaces

Alireza Mohammad Karim, Jonathan P. Rothstein, H. Pirouz Kavehpour

Research output: Contribution to journalArticlepeer-review

40 Scopus citations


Rough hydrophobic surfaces have many applications in industry and technology. An experimental study was done on the spreading dynamics of different concentrations of polyethylene glycol (PEG) solutions on rough Teflon plates with different roughness. The experiments were conducted using Wilhelmy plate method. The advancing dynamic contact angle was found to be weakly dependent of capillary number. However, the receding dynamic contact angle decreases with increasing capillary number. The degree of roughness on rough Teflon surface has an important role on dynamic contact angle. The dynamics of receding motion was found to follow the molecular-kinetic theory. A power law relation between the receding dynamic contact angle and the capillary number was also obtained.

Original languageEnglish (US)
Pages (from-to)658-665
Number of pages8
JournalJournal of Colloid And Interface Science
StatePublished - Mar 1 2018

Bibliographical note

Publisher Copyright:
© 2017 Elsevier Inc.


  • Contact line velocity
  • Dynamic contact angle
  • Molecular-kinetic theory
  • Rough Teflon plate
  • Wilhelmy plate method


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