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A self-cleaning surface using titanium dioxide works by

  • A.photocatalytic oxidation of organic dirt
  • B.physical repulsion of all liquids
  • C.dissolution of the dirt in rainwater
  • D.electrostatic attraction of dust away from the surface

Answer: A

Ultraviolet light generates carriers that oxidise adsorbed organic matter to carbon dioxide and water, and the surface also becomes strongly wetting so rain sheets the residue away. Both effects depend on illumination.

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