The pre-exponential term in Eq. ( ) is the contribution from obstruction effects derived by Tsai and Streider , and the exponential term is from a regression analysis based on simulation results of hydrodynamic effects on spherical solute diffusion through a random network of cylindrical fibers. Viscoelastic stress relaxation. A dynamic oscillatory frequency sweep was performed on a strain-controlled ARES rheometer (TA Instruments, Sollentuna, Sweden) at 25 °C from 0.01-10