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Cover Picture: UV‐Light‐Induced Swelling and Visible‐Light‐Induced Shrinking of a TiO 2 ‐Containing Redox Gel (Adv. Mater. 9/2007)
Author(s) -
Tatsuma T.,
Takada K.,
Miyazaki T.
Publication year - 2007
Publication title -
advanced materials
Language(s) - English
Resource type - Reports
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.200790032
Subject(s) - materials science , visible spectrum , redox , swelling , photochemistry , polymer , photochromism , blue light , chemical engineering , nanotechnology , optoelectronics , composite material , chemistry , engineering , metallurgy
Abstract Polyacrylate gels containing Ag + and TiO 2 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 TiO 2 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.