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Related Experiment Video

Updated: Jul 4, 2025

Rendering SiO2/Si Surfaces Omniphobic by Carving Gas-Entrapping Microtextures Comprising Reentrant and Doubly Reentrant Cavities or Pillars

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Published on: February 11, 2020

Droplet impact on doubly re-entrant structures.

Navdeep Sangeet Singh¹, Thanaphun Jitniyom¹, Miguel Navarro-Cía^1,2

¹School of Engineering, University of Birmingham, Birmingham, B15 2TT, UK.

Scientific Reports

|February 1, 2024

Summary

Doubly re-entrant pillars enhance liquid repellency by optimizing structural parameters. This study reveals how pillar dimensions influence droplet impact dynamics for improved surface wettability.

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Area of Science:

Surface science and fluid dynamics.
Micro/nanostructured surfaces.
Wettability and liquid-repellent technologies.

Background:

Doubly re-entrant pillars offer superior liquid repellency compared to simpler designs.
Understanding the impact of structural parameters on droplet dynamics is crucial for optimizing performance.
Existing research lacks detailed insight into the hydrodynamics of droplet impact on these structures.

Purpose of the Study:

To investigate how key structural parameters of doubly re-entrant pillars affect the hydrodynamics of impacting droplets.
To elucidate the physical phenomena governing surface wettability changes with pillar design.
To establish the influence of specific dimensions on droplet repellency.

Main Methods:

Three-dimensional multiphase flow simulations of droplet impact.
Experimental validation of simulation results.
Systematic variation of pillar dimensions (height, diameter, overhang length/thickness) and surface parameters (pitch, contact angle).

Main Results:

The overhang structure plays a predominant role in dynamic liquid repellency.
Numerical simulations accurately predict droplet impact behavior, validated by experimental data.
Pillar dimensions significantly influence droplet impact dynamics and overall repellency.

Conclusions:

Surface wettability can be effectively manipulated by adjusting doubly re-entrant pillar design parameters.
Optimizing critical dimensional parameters of these structures allows for enhanced droplet behavior control.
This research provides a foundation for designing advanced liquid-repellent surfaces.