Iron oxide-doped photonic crystals are a simple means to wrap fluid droplets and control their movement. But they are also clever because they can be 'bar-coded' and have in-built sensing capabilities, which makes them exceptional candidates for microfluidic devices.
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Buriak, J. Magnetic chaperones for droplets. Nature Mater 3, 847–849 (2004). https://doi.org/10.1038/nmat1271
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DOI: https://doi.org/10.1038/nmat1271
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