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Charge Stabilization of Superparamagnetic Colloids for High-Performance Responsive Photonic Structures



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By securing charged polymer ligands on the surface of superparamagnetic colloids with a layer of porous silica, a strong electrostatic interparticle repulsion with long-term stability can be established to balance the magnetically induced attraction and create 1D periodic chains that show magnetically responsive diffraction in the visible spectrum.