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Shape, structure, and size of tarballs. (A) Tarball particle with attached ns-soot and resting on the substrate (linear fiber). (B) High-resolution TEM image of the tarball and ns-soot in box in A. (C) Size distributions of tarballs (n = 894) and nontarball particles (n = 9,878) from all measured TEM samples. The mode diameters obtained from log-normal peak fits (dotted lines) are 223 nm (σ = 1.6) and 282 nm (σ = 2.4) for tarballs and nontarball particles, respectively.
