Estimating the viscoelastic moduli of complex fluids using the generalized Stokes–Einstein equation

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Particle tracking in living cells: a review of the mean square displacement method and beyond (2013, methodology): “Thus, the complex shear modulus (Mason et al. 1997b; Mason and Weitz 1995), the creep compliance (Xu et al. 1998), and the dynamic moduli (Dasgupta et al. 2002; Mason 2000) can be determined for non-Newtonian fluids using the MSD.”
Microrheology with optical tweezers: data analysis (2012, methodology): “A later approximate method [51] recovered the moduli from the log slope of the MSD, without numerical inversions, and was subsequently improved upon [52] by accounting for curvature.”
Micro- and macrorheology of mucus (2009, neutral): “The viscous (G′′) and elastic (G′) moduli of complex fluids can be inferred from the extent by which the motion of embedded probe beads is restricted [182,185].”
Microrheology of complex fluids (2005, methodology): “In the limit of a freely diffusing particle at low frequencies in a purely viscous fluid there is a simplified expression for the Laplace-transformed MSD (Mason 2000) 〈 r2(s)〉 = 6D s2 (16) and the frequency independent viscosity is recovered η = kT /6πaD equivalent to the Stokes– Einstein equation (”
Biological measurement beyond the quantum limit (2012, background): “with the ratio of loss to storage moduli of the medium given by (26) G/G = tan(πα/2).”