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Soft Janus Colloidal Crystal Film


  • This work was partially supported by a Grant-in-Aid for challenging Exploratory Research (Project No. 24655212), the Core-to-Core Program (Project No.18004) promoted by Japan Society for the Promotion of Science, and a Grant-in-Aid for Scientific Research on Innovative Areas “Molecular Soft-Interface Science” from the Ministry of Education, Culture, Sports, Science and Technology of Japan.


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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.