Fig. 4
From: Unexpected stability of aqueous dispersions of raspberry-like colloids
SEM image of a supersphere and Bragg reflection of it. a Scanning electron micrograph of a dried supersphere formed from a raspberry dispersion in a microfluidic device as described in Fig. 3. b The top image describes the different optical effects produced by densely packed superspheres as observed under the microscope. The red centre spots are caused by specular reflection of non-propagating wavelengths, and the streaks of light are seen where the superspheres touch each other and light is reflected straight back into the microscope. The bottom image is a micrograph obtained in epi-illumination of the superspheres using as small numerical aperture for the illumination (NA = 0.1)
