Technologies are generally described for microfluidic channel devices. Some example devices may include a substrate having a substrate surface, with an array of drive electrode assemblies disposed upon the substrate surface. The drive electrode assemblies may be arranged along a path. Each drive electrode assembly may include one or more of a drive electrode layer, a dielectric layer and/or a stationary phase layer. The device may further include a plate including a plate surface. The device may further include a reference electrode configured on the plate surface to face the stationary phase layer of the drive electrode assemblies and separated from the substrate surface by a distance. The device may further include a voltage source effective to output a voltage potential, the voltage source configured in communication with the drive electrode assembly and the reference electrode. The device may further include an electrode selector effective to control the voltage source.