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Comparing the crystallite size from Scherrer analysis with the hydrodynamic diameter from light scattering, the hydrodynamic figure is

  • A.smaller, excluding the particle's crystalline core
  • B.identical, both measuring the same body
  • C.unrelated to the particle's actual size
  • D.larger, including the coating and solvation layer

Answer: D

Correct answer: larger, including the coating and solvation layer

Scherrer analysis of the X-ray line broadening measures the coherently diffracting crystalline domain, which may even be smaller than a polycrystalline particle. Light scattering measures the whole hydrodynamic entity, coating and associated solvent included. The hydrodynamic figure is therefore always the larger, and comparing the two is a useful check on the state of the dispersion.

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