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New Drop Fluidics Enabled by Magnetic-Field-Mediated Elastocapillary Transduction.

Saheli Biswas¹, Yves Pomeau², Manoj K Chaudhury¹

¹Department of Chemical and Biomolecular Engineering, Lehigh University , Bethlehem, Pennsylvania 18015, United States.

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|June 15, 2016

Summary

Researchers developed a novel soft elastomeric film platform for precise control of water droplet motion using electromagnetically induced surface topography. This new drop fluidics method enables digital manipulation for biochemical reactions like polymerase chain reaction (PCR).

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Area of Science:

Soft Matter Physics
Fluid Dynamics
Microfluidics

Background:

Traditional fluidic systems rely on rigid platforms, limiting precise droplet manipulation.
Controlling droplet movement on surfaces often requires complex external apparatus or chemical treatments.

Purpose of the Study:

To introduce a new drop fluidics platform utilizing a deformable elastomeric film for precise water droplet control.
To demonstrate the manipulation of droplet motion and chemical reactions using electromagnetically controlled surface topography.

Main Methods:

Employing a soft, stretchable elastomeric film embedded with magnetic particles as the fluidic platform.
Modulating the film's topography using an external electromagnetic field to create controlled surface curvatures.
Utilizing elastocapillary forces, generated by oil film deformation on the soft surface, to drive droplet motion.

Main Results:

Demonstrated efficient and accurate control over water droplet motion through electromagnetically induced topographical changes.
Presented a theoretical model correlating droplet speed with geometric and material properties (droplet volume, oil film thickness, viscosity, interfacial tension).
Successfully performed droplet fusion and thermally addressed chemical transformations on the soft platform.

Conclusions:

The developed electromagnetically controlled elastocapillary system offers a novel approach for digital droplet manipulation.
This soft, adaptable fluidics platform shows significant potential for applications in biochemical reaction engineering, including polymerase chain reaction (PCR).