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Pneumatically Driven Microfluidic Platform for Micro-Particle Concentration

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An optopneumatic piston for microfluidics.

Juan Rodrigo Vélez-Cordero¹, Misael Giovani Pérez Zúñiga, Juan Hernández-Cordero

¹Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Apdo. Postal 70-360, Mexico D.F. 04510, Mexico.

|January 16, 2015

Summary

Researchers developed a novel optopneumatic piston using glass capillaries and a PDMS-carbon mixture. This photothermally actuated device functions as a micro-valve or actuator, with motion modeled by viscoelastic principles.

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Area of Science:

Microfluidics
Materials Science
Optomechanics

Background:

Optopneumatic systems offer precise fluid control.
Microfabrication techniques are crucial for developing miniature devices.
Photothermal effects can be harnessed for actuation.

Purpose of the Study:

To demonstrate a novel optopneumatic piston.
To explore its function as a valve and actuator.
To characterize its performance and mechanical behavior.

Main Methods:

Fabrication using wire coating and surface tension-driven instabilities.
Utilizing a PDMS-carbon nanopowder mixture for photothermal response.
Optical excitation via an optical fiber for actuation.

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Characterization of death volume and working frequency.

Main Results:

Successful fabrication of optopneumatic pistons from batch production.
Demonstrated functionality as both a valve and a reciprocal actuator.
Measured death volumes between 0.02 and 1.56 μL.
Achieved maximum working frequency of approximately 1 Hz.

Conclusions:

The optopneumatic piston is a viable microfluidic component.
Its motion can be described using a Kelvin-Voight viscoelastic model.
The fabrication method allows for scalable production.