Microwave Dielectric Heating of Drops in Microfluidic Devices

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Original entry by Sagar Bhandari, APPHY 225 Fall 2010

Reference

Microwave Dielectric Heating of Drops in Microfluidic Devices, David Issadore, Katherine J. Humphry, Keith A. Brown, Lori Sandberg, David Weitz, Robert M. Westervelt, Lab Chip. 2009 June 21; 9(12): 1701–1706.

Keywords

dielectric, microfluidics, heating, drops

Summary

In this paper, the authors present a technique to locally control the temperature of water droplets in a microfluidic device. Since water absorbs microwave power more efficiently than polymers, glass, and oils due to its permanent molecular dipole moment, microwave heating was employed for this purpose. The devices are fabricated using poly(dimethylsiloxane) (PDMS)-on-glass drop-based microfluidics. A schematic cross-section of the device is shown in Fig. 1.

Figure 1:

Sagar wiki2 image1.jpg


Microwave power is locally delivered via metal electrodes that are directly integrated into the microfluidic device and that run parallel to the fluid channel. The drops are thermally insulated from the bulk by being suspended in low thermal conductivity oil.


Figure 2:

Sagar wiki2 image2.jpg