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AFM image of a sample prepared with a nanosphere diameter of 390 nm. The perpendicular bisector, a, of the triangular base is 100 nm, and the interparticle distance is 294 nm. The box depicts the centrosymmetry of particle pairs present in the sample. (B) A line scan of the sample in (A) verifies the theoretical calculations with a = 104 nm and a height = 52 nm (reprinted with permission from Ref. 68, Copyright 2005, American Chemical Society).
