Fig. 4. Visualization of the pronounced flexibility and elasticity of a C-S-H mesocrystal lever prepared by FIB (focused ion beam).

(A) to (F) Picture series of the bending video (available as movie S1) under the scanning electron microscope. The elasticity is revealed because the C-S-H mesocrystal cantilever fully relaxes after the application of a mechanical stress by a micromanipulator (upper left corner). The dashed line in (F) indicates the position of the C-S-H mesocrystal cantilever before bending. Scale bars, 10 μm.