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Updated: Jun 10, 2025

Generation of Size-controlled Poly ethylene Glycol Diacrylate Droplets via Semi-3-Dimensional Flow Focusing Microfluidic Devices

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Dramatic droplet deformation through interfacial particles jamming.

Luoran Shang^1,2, Ke Xu³, Peter J Lu^1,4

¹John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138.

Proceedings of the National Academy of Sciences of the United States of America

|October 10, 2024

Summary

This summary is machine-generated.

Particle-stabilized droplets deform uniquely under shear flow, forming elastic shells that wrinkle and invaginate. This creates novel core-shell structures, controllable by flow conditions like the Peclet number.

Keywords:

colloids droplets jamming microfluidics surfactant

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Fabricating High-viscosity Droplets using Microfluidic Capillary Device with Phase-inversion Co-flow Structure

Published on: April 17, 2018

Area of Science:

Fluid dynamics
Colloid science
Materials science

Background:

Droplets in immiscible fluids are typically spherical due to interfacial tension.
Surfactants and colloidal particles stabilize droplets, but with different mechanisms.
Particle stabilization creates a solid-like interface under compression, unlike surfactants.

Purpose of the Study:

Investigate the effect of particle stabilization asymmetry on droplet shape under shear.
Explore the unique deformations of particle-stabilized droplets in microchannels.
Understand how particle migration and jamming influence droplet morphology.

Main Methods:

Subjecting particle-stabilized droplets to shear flow in a constrained microchannel.
Observing droplet shape dynamics and particle distribution.
Analyzing the influence of the Peclet number on droplet deformation.

Main Results:

Shear induces particle migration, forming an elastic shell at the droplet rear.
Observed wrinkling and invagination of the elastic shell.
Formation of unique core-shell droplet structures.
Droplet shapes are dependent on the Peclet number, balancing shear and diffusion.

Conclusions:

Asymmetric forces in particle-stabilized interfaces lead to complex droplet deformations.
Shear flow can controllably create diverse droplet shapes, including core-shell structures.
Findings offer insights into particle-interface interactions and microfluidic manipulation.