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Figure 8
Upper left-hand figure: SAXS data of bimodal silica nanoparticles (European reference material ERM-FD-102) and a curve fitted using a model of spheres with Gaussian size distribution (black dots and red solid curve, respectively). The uncertainties of the intensity values are displayed as vertical blue lines. Upper right-hand figure: the scattering length density calculator provides a scattering length density of 1.962 × 1011 cm−2 for SiO2 particles with a density of 2.29 g cm−3. Lower figures: panels of the sphere form factor with Gaussian size distribution for the small particles (contribution 1, left-hand side) and large particles (contribution 2, right-hand side).

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