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Related Experiment Video

Updated: Jul 26, 2025

Taking Advantage of Reduced Droplet-surface Interaction to Optimize Transport of Bioanalytes in Digital Microfluidics

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Published on: November 10, 2014

Self-Driven Droplet Motions Below their Icing Points.

Lizhong Wang¹, Guochen Jiang¹, Dongyu Zhu²

¹Laser Materials Processing Research Center, Key Laboratory for Advanced Materials Processing Technology (Ministry of Education), Joint Research Center for Advanced Materials & Anti-icing of Tsinghua University (SMSE)-AVIC ARI, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, P. R. China.

Small (Weinheim an Der Bergstrasse, Germany)

|June 14, 2023

Summary

Discoveries reveal self-driven droplet motion in icing environments, accelerating with distance and volume. These motions, triggered by icing overpressure and frost capillary pulling, require no external energy input, broadening applications in freezing conditions.

Keywords:

droplets icing points self-driven motions superhydrophobic

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Area of Science:

Physics
Materials Science
Fluid Dynamics

Background:

Liquid fluidity is crucial for many technologies, but decreases with temperature, hindering applications in cold environments.
Thermodynamics dictates that liquid fluidity diminishes as temperature drops, leading to solidification below freezing points.

Purpose of the Study:

To discover and demonstrate self-driven droplet motions in icing environments.
To investigate the mechanisms and influencing factors of these motions.
To explore the potential applications of controlled droplet motion in freezing conditions.

Main Methods:

Observation and demonstration of droplet motion in controlled icing environments.
Analysis of motion triggering mechanisms, including spontaneous overpressure and capillary pulling.
Investigation of the influence of liquid properties, surface structures, and pressure gradients.

Main Results:

Self-driven droplet motions, including self-depinning and wriggling, were observed in icing conditions.
Motion accelerates with increasing distance and droplet volume.
Motions are triggered by icing-induced overpressure and amplified by frost capillary forces.
These phenomena are generic across various liquids and micro-nanostructured surfaces.

Conclusions:

Self-driven droplet motion in icing environments is a novel phenomenon.
This discovery offers new possibilities for manipulating liquids in freezing conditions.
Potential applications span energy, microfluidics, and bio-delivery systems operating in cold climates.