Figure 1: Formation of CaCO3 microlens array.
From: Self-assembly of amorphous calcium carbonate microlens arrays
(a) Schematic illustration for the formation of CaCO3 microlens array. (b,c) SEM images of CaCO3 agglomerates after 1–2 min of reaction. The scale bars are 1 μm. The inset of c is a magnified image of the white dotted box. The scale bar is 200 nm. White arrows indicate the nanometre-sized CaCO3 precipitates. (d) In situ optical microscopy images observed on the surface of Ca(OH)2 solution versus reaction time. The scale bar is 10 μm. (e) The changes of both pH (red dot) in Ca(OH)2 solution and averaged size (green rectangle) of CaCO3 microlens with standard deviation plotted versus time (statistics from size measurement of 150 microlenses for each time point, 50 microlenses from each of three different samples).
