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(a) Tapping-mode AFM image of purified 10 nm NP-A-633 after three cycles of centrifugation and re-dispersal at a pixel resolution of 9.76 nm/px × 9.76 nm/px. (b) A histogram of observed particles reveals a mean particle height of 9.80 nm with a FWHM (red dotted line) of 4.6 nm over a sample size of 1,258 particles.
