In a chromatographic separation process, a biomolecule of 20 nm diameter is diffusing into a random porous particle with void fraction (e) of 0.70 filled with elution solvent. However, the reduced pore diameter (j) for the diffusion process is only 0.010, and hindered diffusion of the solute within the solvent-filled pore can be neglected. If the desired effective diffusion coefficient (D'_Ae) of the biomolecule inside the porous particle is 1.0 × 10^–7 cm²/s at 30°C, what solvent viscosity would be needed to achieve this D'_Ae?