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Jianping Ge, Yongxing Hu and Yadong Yin Highly Tunable Superparamagnetic Colloidal Photonic Crystals Angewandte Chemie International Edition 46

Article first published online: 3 JUL 2007 | DOI: 10.1002/anie.200701992

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Tuning crystal: Superparamagnetic nanocrystal clusters can self-assemble into colloidal photonic crystals in solution, whose stop bands can be magnetically tuned across the entire visible spectrum. Owing to the high magnetization and the highly charged polyacrylate-capped surface of each cluster, the colloidal photonic crystals show a rapid, reversible, and widely tunable optical response to external magnetic fields.

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