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In addition, the nanostructure analysis of primary particles (graphene layer length, tortuosity and separation distance) was also investigated by using high resolution transmission microscopy (HRTEM) and an image analysis algorithm. ...Such primary particles are characterized by short mean graphene layer length (Lmean ≈ 0.5 nm) and an unordered configuration resulting in an increased separation distance (Dmean ≈ 1 nm). ...Conversely, inhomogeneous mixtures result in increased formation of primary particles showing long, extended and more ordered graphene (Lmean ≈ 0.55 nm, Dmean = 0.4 nm), which in turn lead to low soot reactivity (Tmax ≈ 615°C).