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Hydrophobic properties and applications of dye-based ink gratings. (a1) black, (a2) red, (a3) blue, and (a4) brown ink wavelength filters. (b) Hydrophobicity measurements on the dye-based inks. (c) The nanopatterned gratings in array form. (d,e) hydrophobicity contact angle change. (f1,f2) Blue ink based 1D grating personal security signature. (g1,g2) Black ink based surface grating University of Birmingham logo. Scale bar = 5 mm.
