[en] Microfabrication techniques allow the development and production of artificial superhydrophobic surfaces that possess a precisely controlled roughness at the micrometer level, typically achieved through the arrangement of micropillar structures in periodic patterns. In this work, we analyze the stability and energy barrier of droplets in the Cassie−Baxter (CB) state on such periodic patterns. In addition, we further develop a transition criterion using the CB equation and derive an improved version which allows predicting for which pillar geometries, equilibrium contact angles, and droplet volumes the CB state switches from a metastable to an unstable state. This enables a comparison with existing experiments and three-dimensional multiphase Lattice Boltzmann simulations for different pillar distances, two contact angles, and two droplet volumes, where a good agreement has been found.
Research center :
ULHPC - University of Luxembourg: High Performance Computing
Disciplines :
Materials science & engineering
Author, co-author :
JAEGER, Tobias ; University of Luxembourg > Faculty of Science, Technology and Medicine > Department of Engineering > Team Stephan LEYER
Mokos, Athanasios
Prasianakis, Nikolaos I.
LEYER, Stephan ; University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Engineering (DoE)
External co-authors :
yes
Language :
English
Title :
Validating the Transition Criteria from the Cassie−Baxter to the Wenzel State for Periodically Pillared Surfaces with Lattice Boltzmann Simulations
Publication date :
February 2024
Journal title :
ACS Omega
eISSN :
2470-1343
Publisher :
American Chemical Society, Washington DC, United States - Washington