Front surface view of an electrosprayed layer. Light is coming from four different incident angles at 55°, 35°, 30°, and 20°, from top left to down right, and reflecting light corresponding to purple, blue, green, and orange wavelength. The sample displayed area is 5 × 5 mm2.
Coll et al. Nanoscale Research Letters 2013 8:26 doi:10.1186/1556-276X-8-26