A pH-responsive surface has been fabricated by chemisorption of HS(CH2)9CH3 and HS(CH2)10COOH in an appropriate ratio onto a fractal-like gold structure. The surface exhibits superhydrophobicity in an acidic environment and superhydrophilicity under basic conditions. The Figure (right, top) shows an acid droplet on the gold surface, while the image below it shows a base droplet.
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