On these scales of observation the structure and the dynamics of the molecules forming the dispersion medium are no longer resolved and one only "sees" the arrangement and the motion of the dispersed colloids. Thus, in an light scattering experiment spherical colloids appear like atoms in an Xray or neutron scattering experiment (wavelength (( particle distances) - except that the void between atoms is replaced by an inert, structureless medium (the dispersion medium) with a finite viscosity; the existence of this medium has some significant effects on colloid dynamics ( hydrodynamic interactions.
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