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Aqueous Droplets Used as Enzymatic Microreactors and Their Electromagnetic Actuation

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Published on: August 28, 2017

Magnetically actuated colloidal microswimmers.

Pietro Tierno¹, Ramin Golestanian, Ignacio Pagonabarraga

¹Departament de Química Física, Universitat de Barcelona, Martí i Franquès 1, 08028 Barcelona, Spain. ptierno@ub.edu

The Journal of Physical Chemistry. B

|April 16, 2009

Summary

This summary is machine-generated.

Researchers developed DNA-linked colloidal rotors for controlled micro-object propulsion in fluids. This novel method uses magnetic fields to convert rotational motion into translation, advancing microfluidics and biotechnology.

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Area of Science:

Microfluidics
Biotechnology
Colloidal science
Nanotechnology

Background:

Achieving controlled propulsion of micro-objects in confined fluids remains a significant challenge for microfluidics and biotechnology.
Existing strategies for microscale swimming engines lack simplicity, versatility, and full controllability.

Purpose of the Study:

To demonstrate a novel method for achieving controlled propulsion of micro-objects using DNA-linked anisotropic colloidal rotors.
To explore the potential of externally rotated micro/nano-objects for directed movement in microfluidic systems.

Main Methods:

Fabrication of anisotropic colloidal rotors from paramagnetic particles linked by DNA.
Application of a precessing magnetic field parallel to the plane of motion to induce rotational motion.
Exploitation of differential viscous friction between a bounding plate and bulk fluid to rectify rotation into translation.

Main Results:

DNA-linked colloidal rotors achieved controlled propulsion under a precessing magnetic field.
Asymmetric viscous dissipation rectified rotational motion into net translation of the objects.
Demonstrated guidance of colloidal rotors through microfluidic channels.

Conclusions:

The developed method offers a simple, versatile, and controllable approach for micro-object propulsion.
This technique has broad applicability to any externally rotated micro/nano-object.
The findings pave the way for advanced applications in microfluidics and biotechnology.