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Updated: May 29, 2026

A Microfluidic Device for Quantifying Bacterial Chemotaxis in Stable Concentration Gradients

A Microfluidic Device for Quantifying Bacterial Chemotaxis in Stable Concentration Gradients

Published on: April 19, 2010

Microfluidic quadrupole and floating concentration gradient.

Mohammad A Qasaimeh¹, Thomas Gervais, David Juncker

¹Biomedical Engineering Department, McGill University, Montréal, Quebec, Canada.

Nature Communications

|September 8, 2011

Summary

This summary is machine-generated.

Researchers experimentally demonstrated a microfluidic quadrupole, creating a tunable, floating concentration gradient. This work opens new avenues for studying microfluidic multipoles and their complex fluid dynamics.

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Analyzing Mixing Inhomogeneity in a Microfluidic Device by Microscale Schlieren Technique

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Published on: June 12, 2015

Area of Science:

Fluid Dynamics
Microfluidics
Physical Chemistry

Background:

Fluidic multipoles are theoretical solutions to the Navier-Stokes equation.
Experimental evidence and characterization of fluidic multipoles have been lacking.
Microfluidic systems offer precise control over fluid behavior.

Purpose of the Study:

To experimentally realize and analyze a two-dimensional microfluidic quadrupole.
To investigate the formation and properties of concentration gradients in microfluidic multipoles.
To provide a foundation for further research into microfluidic planar multipoles.

Main Methods:

Fabrication of a microfluidic probe with opposing apertures.
Simultaneous fluid injection and aspiration to create a quadrupole flow.
Theoretical analysis consistent with experimental observations.

Main Results:

Successful creation of a two-dimensional microfluidic quadrupole.
Observation of a central stagnation point with hydrodynamic tunability.
Formation of a stationary, tunable, and movable concentration gradient at the stagnation point.

Conclusions:

The study presents the first experimental observation of a microfluidic quadrupole.
The developed system allows for the creation of controllable 'floating' concentration gradients.
This research paves the way for exploring convective-diffusive phenomena in microfluidic multipoles.