Figure 1.

Scanning electron micrographs of self-assembled titania nanoshells. (a) Lower magnification micrograph of nanoshells dispersed over a matrice. (b) Micrograph of titania nanoshells of rather narrow size distribution. Average diameter calculated from 40 random nanoshells was ca. 1 μm (standard deviation (SD) 760 nm). (c) An example of nanoshells with higher size distribution. (d) Micrograph with several broken nanoshells. Average diameter calculated from 40 random nanoshells was ca. 680 nm (SD = 410 nm). The inset in (d) shows several incomplete nanoshells at 9000× magnification.