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Related Experiment Video

Updated: Dec 22, 2025

Assembly and Characterization of an External Driver for the Generation of Sub-Kilohertz Oscillatory Flow in Microchannels

Assembly and Characterization of an External Driver for the Generation of Sub-Kilohertz Oscillatory Flow in Microchannels

Published on: January 28, 2022

Liquid flow and control without solid walls.

Peter Dunne^1,2, Takuji Adachi^1,3, Arvind Arun Dev²

¹Université de Strasbourg, CNRS, ISIS, Strasbourg, France.

|May 8, 2020

Summary

This summary is machine-generated.

Researchers developed novel liquid-in-liquid fluidic channels, avoiding solid walls for self-healing, non-clogging systems. This magnetic field-stabilized approach enables gentle, efficient transport of delicate liquids like whole human blood with reduced cell damage.

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Last Updated: Dec 22, 2025

Assembly and Characterization of an External Driver for the Generation of Sub-Kilohertz Oscillatory Flow in Microchannels

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Fabrication, Operation and Flow Visualization in Surface-acoustic-wave-driven Acoustic-counterflow Microfluidics

Fabrication, Operation and Flow Visualization in Surface-acoustic-wave-driven Acoustic-counterflow Microfluidics

Published on: August 27, 2013

Area of Science:

Microfluidics
Fluid Dynamics
Materials Science

Background:

Miniaturizing fluidic circuitry faces challenges with solid channel walls, including flow rate limitations and fouling.
Existing methods to mitigate wall interactions (e.g., coatings, electrowetting) have limitations.
Droplet microfluidics and sheath flow avoid solid walls but require continuous liquid flow.

Purpose of the Study:

To develop a novel fluidic channel system that eliminates the need for solid walls.
To create self-healing, non-clogging, and anti-fouling microfluidic channels.
To demonstrate precise flow control and gentle liquid transport, particularly for delicate biological samples.

Main Methods:

Aqueous liquid channels are surrounded by an immiscible magnetic liquid.
A quadrupolar magnetic field stabilizes the liquid-in-liquid interface, creating fluidic channels.
Magnetostaltic pumping, using external permanent magnets, controls liquid flow without physical contact.

Main Results:

The liquid-in-liquid channels exhibit self-healing, non-clogging, and anti-fouling properties.
Magnetostaltic pumping allows for effective valving, splitting, merging, and pumping of liquids.
Transport of whole human blood showed an order of magnitude reduction in haemolysis compared to peristaltic pumping.

Conclusions:

This liquid-in-liquid approach offers a superior alternative to traditional microfluidic channels, especially for delicate liquids.
The system enables precise flow control and gentle transport at the microscale without high pressures.
Potential applications include advanced microfluidic circuitry and improved handling of biological fluids.