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Magnetofluidic tweezing based on negative magnetophoresis and microfabricated core–shell magnetic microtips allows controlled on‐demand assembly of colloids and microparticles into various static and dynamic structures such as colloidal crystals (as shown for 3.2 μm silica particles).
B. A. Grzybowski and co‐workers develop a novel approach to magnetofluidic tweezing, described on page 3453. This approach overcomes several limitations of other tweezing modalities and allows the controlled assembly of small particles into various static and dynamic structures: the image depicts the generation of colloidal crystals.
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