Abstract
Due to the wide applications of magnetic nanomaterials in biology, pharmacy, and diagnostics, there is an increasing need for controlled transport of their small volumes of liquids. Here, we designed a simple, high-efficiency, and flexible method for reversibly oriented transport of superparamagnetic microdroplets with no lost volume by alternating magnetic fields. Superhydrophobic surfaces with high adhesive force played an important role, and the success of reversibly no lost transport also relied on the sensitive responsive property of the superparamagnetic microdroplet to applied magnetic fields. Such a magnetic-field-induced intelligent transport method would be especially helpful for many localized chemical or biological reactions, traced analysis, and in situ detection.
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