Anisotropic Wetting of Hydrophobic and Hydrophilic Surfaces–Modelling by Lattice Boltzmann Method

Abstract

Anisotropic wetting on unidirectionally textured surfaces was investigated by Lattice Boltzmann Method. Previously published experimental data were used to validate the numerical model. New analysis were carried out by changing static contact angle of grooved surfaces from hydrophilic to hydrophobic (θ s = 50 − 150 • ). Presented results suggests that anisotropic wetting on unidirectionally textured surfaces is governed by spreading along the grooves by capillary action and mainly is dominant in Wenzel state on hydrophilic surfaces. Transition to Cassie-Baxter state on hydrophobic surfaces (θ s > 90 • ) significantly reduces the effect of anisotropic wetting. Structured texture and/or chemical heterogeneity can be potentially used to manipulate droplets in case of hydrophobic surfaces.

Anisotropic wetting characteristics versus roughness on machined surfaces of hydrophilic and hydrophobic materials

“…Nevertheless,  on GF30 surface is much smaller than that on AA6061 surface. It is basically consistent with simulation results [43]. The different  are mainly caused by the two wetting states.…”

Surface Etching of 3D Printed Poly(lactic acid) with NaOH: A Systematic Approach

“…Consistent with literature, the CA depends on both the chemical properties and the surface roughness. The two common models for describing the wettability of surfaces are by Wenzel and Cassie and Baxter [32][33][34][35].…”

“…In contrast, Kubiak at al. [32] suggested that the Wenzel model is suited for use on hydrophilic surfaces and the Cassie-Baxter model for hydrophobic surfaces. Again, as the current materials are between both models, it is rather difficult to properly assign a specific model for a description of the CA.…”

“…Consistent with literature, the CA depends on both the chemical properties and the surface roughness. The two common models for describing the wettability of surfaces are by Wenzel and Cassie and Baxter [ 32 , 33 , 34 , 35 ]. However, these models are for idealized surfaces and have their limitations in the description of real surfaces [ 35 ].…”

Analysis of surface roughness morphology with TRIZ methodology in automotive electrical contacts: Design against third body fretting-corrosion

“…However, it is known that high surface quality promotes friction damage [32]. Kubiak et al [30,[33][34][35] report that surface geometry influences friction conditions due to the increased contact force on rough surfaces [36]. This makes it possible to control the friction between the partial slip (only the outer contact area is exposed to the slip, while the central area remains in an adhesive state) and the total slip (the entire contact surface is exposed to the slip).…”