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(a) Schematic of an interfacial nanobubble. θ ∼ 16°, 
. (Reproduced with permission from [29]. Copyright © American Chemical Society.) (b) AFM tapping mode image of stable nanobubbles on a mica surface in water. Image size 1 × 1 µm. (Reproduced with permission from [30]. Copyright © AIP Publishing LLC.)
