Stability of micro-Cassie states on rough substrates

• Author(s) / Creator(s)

  • Guo, Zhenjiang
  • Liu, Yawei
  • Lohse, Detlef
  • Zhang, Xuehua
  • Zhang, Xianren

• We numerically study different forms of nanoscale gaseous domains on a model for rough surfaces. Our calculations based on the constrained lattice density functional theory show that the inter-connectivity of pores surrounded by neighboring nanoposts, which model the surface roughness, leads to the formation of stable microscopic Cassie states. We investigate the dependence of the stability of the micro-Cassie states on substrate roughness, fluid-solid interaction, and chemical potential and then address the differences between the origin of the micro-Cassie states and that of surface nanobubbles within similar models. Finally, we show that the micro-Cassie states share some features with experimentally observed micropancakes at solid-water interfaces.

• Date created

  2015-01-01

• Subjects / Keywords

  • Density functional theory
  • Phase transitions
  • Free energy
  • Thermodynamic functions
  • Carbon based materials
  • Nanofluidics
  • Chemical elements
  • Supersaturation
  • Chemical compounds
  • Cooperative effect

• Type of Item

  Article (Published)

• DOI

  https://doi.org/10.7939/r3-cs2e-bn30

• License

  © 2015 AIP Publishing LLC