title: Unraveling wetting transition through surface textures with X-rays: liquid meniscus penetration phenomena.
abstract: In this report we show that synchrotron X-ray radiography is a powerful method to study liquid-air interface penetration through opaque microtextured surface roughness, leading to wetting transition. We investigate this wetting phenomenon in the context of sessile drop evaporation, and establish that liquid interface sinking into the surface texture is indeed dictated by the balance of capillary and Laplace pressures, where the intrinsically three-dimensional nature of the meniscus must be accounted for. Air bubble entrapment in the texture underneath impacting water drops is also visualized and the mechanisms of post-impact drop evaporation are discussed.
authors: 1] Laboratory of Thermodynamics in Emerging Technologies, Mechanical and Process Engineering Department, ETH Zurich, 8092 Zürich, Switzerland [2].
authors: C
authors: C
authors: Antonini
authors: 1] Chair of Building Physics, ETH Zurich, Wolfgang-Pauli-strasse 15, CH-8093 Zürich, Switzerland [2].
authors: J B
authors: JB
authors: Lee
authors: 1] Laboratory of Thermodynamics in Emerging Technologies, Mechanical and Process Engineering Department, ETH Zurich, 8092 Zürich, Switzerland [2].
authors: T
authors: T
authors: Maitra
authors: Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen, Switzerland.
authors: S
authors: S
authors: Irvine
authors: Laboratory for Building Science and Technology, Swiss Federal Laboratories for Materials Science and Technology, EMPA, Überlandstrasse 129, CH-8600 Dübendorf, Switzerland.
authors: D
authors: D
authors: Derome
authors: Laboratory of Thermodynamics in Emerging Technologies, Mechanical and Process Engineering Department, ETH Zurich, 8092 Zürich, Switzerland.
authors: Manish K
authors: MK
authors: Tiwari
authors: 1] Chair of Building Physics, ETH Zurich, Wolfgang-Pauli-strasse 15, CH-8093 Zürich, Switzerland [2] Laboratory for Building Science and Technology, Swiss Federal Laboratories for Materials Science and Technology, EMPA, Überlandstrasse 129, CH-8600 Dübendorf, Switzerland.
authors: J
authors: J
authors: Carmeliet
authors: Laboratory of Thermodynamics in Emerging Technologies, Mechanical and Process Engineering Department, ETH Zurich, 8092 Zürich, Switzerland.
authors: D
authors: D
authors: Poulikakos