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Dr. Syuji Fujii, Dr. Michael Kappl, Prof. Dr. Hans-Jürgen Butt, Tatsuya Sugimoto and Prof. Dr. Yoshinobu Nakamura Soft Janus Colloidal Crystal Film Angewandte Chemie International Edition 51

Version of Record online: 31 AUG 2012 | DOI: 10.1002/anie.201204358

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Two-faced character in a film: Soft “Janus” two-dimensional colloidal crystal films were made using polystyrene (PS) particles, on an air–water interface as a mold for a flexible polypyrrole layer. By removing the PS particles, an array of femtoliter-sized cups was produced. These two-dimensional colloidal crystal films can also be transferred onto substrates with curvature.

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