Fractional Stokes-Einstein Relationship in Biological Colloids: Role of Mixed Stick-Slip Boundary Conditions
نویسندگان
چکیده
The bovine serum albumin mutual diffusion coefficient D has been measured by photon correlation spectroscopy as a function of protein concentration. The solution viscosity ηsol has been obtained by following the diffusion of spherical probes added, at a small volume fraction, to the protein solution. It is found that D follows a fractional Stokes-Einstein relation D ∼ 1/ηsol R with R = 0.5 up to a protein concentration C = 15 g/dL. The observed behavior has been traced back to interparticle interactions taking into account the possibility of mixed stick-slip boundary condition at the protein-water interface.
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