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  4. Experimentally validated phase-field model to design the wettability of micro-structured surfaces
 
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2023
Journal Article
Title

Experimentally validated phase-field model to design the wettability of micro-structured surfaces

Abstract
Surfaces with tailored wettability have attracted considerable attention because of their wide range of potential applications. Wettability can be finely designed by controlling the chemistry and/or morphology of a surface. However, the commonly adopted analytical theories of Wenzel and Cassie-Baxter cannot describe a variety of intermediate and metastable states, being a thorough understanding of the combined chemical and morphological effect on surface wettability still lacking. Hence, the design and optimization of these surfaces is generally expensive and time-consuming. In this work, we propose a numerical method based on the phase-field model to predict the wettability of micro-structured surfaces and assist their design. First, we simulated the sessile droplet experiment on flat surfaces to calibrate model parameters. Second, we modelled several surface morphologies, intrinsic contact angles and droplet impact velocities. Finally, we produced and tested 3D printed flat and micro-structured samples to validate the phase-field model, obtaining a reasonable qualitative and quantitative agreement between numerical and experimental results. The validated model proposed here can help design and prototype surfaces with tailored wettability. Furthermore, integrated with atomistic/mesoscopic simulations, it represents the last step of a predictive multi-scale model, where both chemical and morphological features of surfaces can be designed a priori.
Author(s)
Provenzano, Marina
Politecnico di Torino, Department of Energy
Bellussi, Francesco Maria
Politecnico di Torino, Department of Energy
Morciano, Matteo
Politecnico di Torino, Department of Energy
Rossi, Edoardo
Universitá degli studi Roma Tre, Department of Engineering
Schleyer, Mario
Fraunhofer-Institut für Werkstoffmechanik IWM  
Asinari, Pietro
Politecnico di Torino, Department of Energy
Straub, Thomas  
Fraunhofer-Institut für Werkstoffmechanik IWM  
Sebastiani, Marco
Universitá degli studi Roma Tre, Department of Engineering
Fasano, Matteo
Politecnico di Torino, Department of Energy
Journal
Materials and design  
Project(s)
Open characterisation and modelling environment to drive innovation in advanced nano-architectured and bio-inspired hard/soft interfaces  
Funder
European Commission  
Open Access
DOI
10.1016/j.matdes.2023.112042
Language
English
Fraunhofer-Institut für Werkstoffmechanik IWM  
Keyword(s)
  • additive manufacturing

  • phase-field model

  • sessile droplet

  • surface engineering

  • wettability

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