Micro Mirror Polymer Composite Offers Mechanically Switchable Light Transmittance


  • We thank ETH Zurich for financial support. Urs Krebs is kindly acknowledged for designing and manufacturing the different set-ups (Supporting Information is available online from Wiley Online Library or from the author).



Elastic silicone composites with mechanically switchable transparency are generated by incorporating micron-sized aluminum platelets into a highly flexible silicone. Physisorbing Fe3O4 nanoparticles onto the platelets surface allow magnetic pre-alignment during the polymer curing. One-dimensional or two-dimensional stretching of the resulting silicone composites permits orientation of the incorporated flakes and alters light transmittance of the polymer coating.