17 November 2006
Vol 314, Issue 5802

About The Cover

Cover image expansion

COVER Fluorescence optical microscopy image of cadmium selenide nanoparticles. These polyethylene glycol-functionalized nanoparticles have segregated to cracks in a composite film confined between a brittle silicon oxide layer and a silicon substrate. Field of view is 30 by 50 m. See the special section on materials science beginning on page 1099. Image: S. Gupta and Q. Zhang