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Related Experiment Video

Updated: Feb 2, 2026

Double Emulsion Generation Using a Polydimethylsiloxane PDMS Co-axial Flow Focus Device

Double Emulsion Generation Using a Polydimethylsiloxane PDMS Co-axial Flow Focus Device

Published on: December 25, 2015

A Dewetting Model for Double-Emulsion Droplets.

Zhanxiao Kang^1,2, Pingan Zhu^3,4, Tiantian Kong^5,6

¹Department of Mechanical Engineering, The University of Hong Kong, Hong Kong, China. zxkang@connect.hku.hk.

|November 9, 2018

Summary

This summary is machine-generated.

The study reveals how double-emulsion droplet evolution is driven by interfacial tensions and viscosity. Equilibrium configurations depend on interfacial tension ratios, influencing dewetting time in microparticle applications.

Keywords:

dewetting force dewetting time double emulsion equilibrium configuration

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Area of Science:

Fluid dynamics
Materials science
Physical chemistry

Background:

Double-emulsion droplets are crucial for microdroplet and microparticle applications.
Understanding droplet evolution, including dewetting, is key to controlling microparticle formation.

Purpose of the Study:

To investigate the driving forces behind the dewetting process of double-emulsion droplets.
To determine the equilibrium configuration and predict the dewetting time of these droplets.

Main Methods:

Energy analysis was employed to understand droplet equilibrium.
A dewetting boundary concept was introduced to calculate dewetting time.
The study balanced driving forces (interfacial tensions) against viscous forces.

Main Results:

Equilibrium configuration depends on a dimensionless interfacial tension, influenced by three interfacial tensions.
Increased outer phase volume leads to a larger engulfed inner phase.
Dewetting time increases with outer phase viscosity and the volume ratio of outer to inner phases.

Conclusions:

The study provides insights into the physical mechanisms governing double-emulsion droplet evolution.
Predictive models for dewetting time can be developed based on interfacial properties and phase volumes.
Findings are applicable to the controlled fabrication of microparticles and microdroplets.