Advanced Materials

Cover image for Vol. 28 Issue 24

19_09/2007Cover Picture: UV-Light-Induced Swelling and Visible-Light-Induced Shrinking of a TiO2-Containing Redox Gel (Adv. Mater. 9/2007)

Polyacrylate gels containing Ag+ and TiO2 nanoparticles are shown to swell under UV light and shrink under visible light in water. In work reported by Tetsu Tatsuma and co-workers on p. 1249, the TiO2 absorbs UV light and reduces the Ag+, whereas the deposited Ag absorbs visible light and dissolves itself. These redox reactions change the interactions between the polymer chains and eventually the volume of the gel, as shown on the cover.

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