Cu2O MIP Research & information: general SEM XRD XRF acrylic-based paints anti-graffiti coatings calcium hydroxide chemical cleaning conservation cultural heritage earth site felt-tip markers fungus resistance goose down hydrophobic treatments marble microscopic mechanism analysis morphology analysis nano-particles oil-water separation oleophobicity organosilicon thin layers plasma deposition robust superhydrophobic surface siloxane silt sodium methyl silicone stone protection