Dynamic wetting: Hydrodynamic or molecular-kinetic?

Srinivas R. Ranabothu, Cassandra Karnezis, Lenore L. Dai

Research output: Contribution to journalArticlepeer-review

85 Scopus citations


The dynamic wetting behavior of simple liquids (water, glycerin, formamide, ethylene glycol, and a mixture of water and ethylene glycol) and polydimethylsiloxane (PDMS) oils with different viscosities has been investigated. The hydrodynamic, molecular-kinetic, and combined molecular-hydrodynamic models have been applied to the experimental results to evaluate the models' adequacy. Our work suggests that the molecular displacement, i.e., the adsorption and desorption process, seems to be dominant for the simple liquids investigated. For polydimethylsiloxanes, our work suggests that none of the evaluated models is sufficient to explain the experimentally observed dependence of the dynamic contact angle on contact velocity. This work, to the best of our knowledge, provides the first extensive comparison of the three models with experimental data over a wide range of viscosity. In addition, we have investigated the contact angle hysteresis and conclude that it is a strong function of the contact speed, the interactions between the fluids and the substrate, and the fluid viscosity.

Original languageEnglish (US)
Pages (from-to)213-221
Number of pages9
JournalJournal of Colloid And Interface Science
Issue number1
StatePublished - Aug 1 2005
Externally publishedYes


  • Combined model
  • Contact angle hysteresis
  • Contact angles
  • Dynamic wetting
  • Hydrodynamic model
  • Molecular-kinetic model

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry


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