Advanced Materials, Vol.19, No.9, 1249-1249, 2007
UV-light-induced swelling and visible-light-induced shrinking of a TiO2-containing redox gel
A poly(acrylate) gel containing Ag+ and TiO2 nanoparticles is swollen by UV light and shrunk by visible light in water (see figure and cover). The swollen gel keeps its size and shape in the dark. Localized irradiation with UV and visible light causes localized swelling and shrinking, respectively.