Patent ID: 7323225

Claim:
A wettability changing layer comprising a wettability changing material and a metal salt, wherein: the layer has a thickness of 100 to 1,000 angstroms; the layer is capable of charge-injection and/or charge-transfer; wettability of the layer changes when light energy is applied to the layer; and the metal salt selected from the group consisting of FeCl 2 , FeCl 3 , Cr(NO 3 ) 3 , CrCl 3 , NaNO 3 , Ca(NO 3 ) 2 , Sr(NO 3 ) 2 , Co(NO 3 ) 2 , CpCl 2 , Cd(NO 3 ) 2 , Mg(NO 3 ) 2 , Cu(CH 3 COO) 2 , Cu(NO 3 ) 2 , Ni(NO 3 ) 2 , Mn(NO 3 ) 2 , MnCl 2 , PbNO 3 , RuCl 3 , IrCl 4 , Ir(NO 3 ) 3 , ScCl 3 , Sc(NO 3 ) 3 , H 2 PtCl 6 , RhCl 3 , Tb(NO 3 ) 3 , Pr(NO 3 ) 3 , Dy(NO 3 ) 3 , Sm(NO 3 ) 3 , Ga(NO 3 ) 3 , Gb(NO 3 ) 3 , Yb(NO 3 ) 3 , NbCl 5 , ZrCl 4 , Zr(NO 3 ) 2 , KNO 3 , LiNO 3 , HAsCl 4 , Pd(NO 3 ) 2 , Eu(NO 3 ) 2 , Nd(NO 3 ) 2 , NiCl 3 , Ce(NO 3 ) 3 , CsNO 3 , Er(NO 3 ) 3 , Ba(NO 3 ) 2 , La(NO 3 ) 3 , AgCl, CH 3 CH(OH)COOAg, AgNO 3 , TlNO 3 , Y(NO 3 ) 3 , Pb(NO 3 ) 2 , Ho(NO 3 ) 3 , Bi(NO 3 ) 3 and mixtures thereof.