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Stability of micro-Cassie states on rough substrates
Zhenjiang Guo1, Yawei Liu1, Detlef Lohse2
1State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China.
The Journal of Chemical Physics
|July 3, 2015
Summary
Stable microscopic Cassie states form on rough surfaces due to interconnected nanopores. This study explores their stability and relation to surface nanobubbles and micropancakes.
Area of Science:
- Surface science
- Nanotechnology
- Computational physics
Background:
- Surface roughness significantly influences fluid behavior at the nanoscale.
- Understanding nanoscale gaseous domains is crucial for various applications.
Purpose of the Study:
- To numerically investigate the formation and stability of nanoscale gaseous domains on rough surfaces.
- To analyze the factors affecting the stability of micro-Cassie states.
- To differentiate micro-Cassie states from surface nanobubbles.
Main Methods:
- Constrained lattice density functional theory for numerical simulations.
- Modeling of surface roughness using nanoposts.
- Analysis of pore inter-connectivity.
Main Results:
- Inter-connectivity of pores leads to stable microscopic Cassie states.
- Stability depends on substrate roughness, fluid-solid interaction, and chemical potential.
- Micro-Cassie states share characteristics with experimental micropancakes.
Conclusions:
- Nanopore inter-connectivity is key for stable micro-Cassie states on rough surfaces.
- Micro-Cassie states exhibit distinct origins compared to surface nanobubbles.
- Findings align with experimental observations of micropancakes.
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