Key points are not available for this paper at this time.
Metal in microfluidic channels: The fabrication of electromagnets (solder) with micron-scale dimensions in poly(dimethylsiloxane) in close proximity (ca. 10-μm separation) to microfluidic channels is described (see pictures, top view and cross section). The method only has four steps and can be completed in 10 min. By passing an electric current through the magnets, magnetic field gradients are generated inside the microfluidic channels, which can be used to capture and release superparamagnetic beads in the microfluidic channel.
Siegel et al. (Tue,) studied this question.