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Related Experiment Video

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Optothermally actuated capillary burst valve.

Johan Eriksen¹, Brian Bilenberg², Anders Kristensen¹

¹DTU Nanotech, Technical University of Denmark, Oersted Plads, Building 345C, DK-2800 Kongens Lyngby, Denmark.

The Review of Scientific Instruments

|May 1, 2017

Summary

Researchers developed a new method to burst microfluidic valves using optothermal actuation. This technique precisely controls temperature-dependent surface tension for targeted valve release and particle capture.

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Area of Science:

Microfluidics
Optothermal Actuation
Polymer Science

Background:

Microfluidic devices offer precise fluid control for various applications.
Existing methods for actuating microfluidic valves can be complex or lack precision.
Capillary burst valves present a passive method for fluidic control, but active actuation is challenging.

Purpose of the Study:

To demonstrate optothermal actuation of individual capillary burst valves in an all-polymer microfluidic device.
To investigate the use of temperature-dependent surface tension for valve bursting.
To show targeted capture of microparticles triggered by valve actuation.

Main Methods:

Fabrication of all-polymer microfluidic devices with planar capillary burst valves featuring a fluidic constriction.
Integration of a near-infrared (NIR) absorber dye film in the device lid for local heating.
Optothermal actuation using a focused laser to locally raise temperature and induce valve bursting.

Main Results:

Successfully demonstrated optothermal bursting of individual capillary burst valves.
Showed that valve bursting is achieved by exploiting the temperature dependence of fluid surface tension.
Demonstrated triggered capture of single 7 μm polystyrene beads in the valve constriction post-bursting.

Conclusions:

Optothermal actuation provides a precise and localized method for controlling capillary burst valves in microfluidic systems.
This technique enables triggered particle capture, advancing microfluidic applications in sensing and manipulation.
The all-polymer design offers a cost-effective and scalable platform for optothermally actuated microfluidics.