Diffusion coefficient versus grain size for two values of number density. The diffusion coefficient behaves qualitatively differently at different densities. While at high densities, the diffusion coefficient increases monotonically with increasing grain radius, it has a maximum for low densities at a grain size of agr ≈ 0.065 μm. Below this radius, the effect of better coupling dominates, while at larger grain sizes the decreased surface area of the larger grains leaves more free gas-phase charges, with associated higher conductivity, and conversely decreased resistivity.
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