Application of Stokes' law to ions in aqueous solution

Ion Permeability of Free-Suspended Layer-by-Layer (LbL) Films Prepared Using an Alginate Scaffold

“…The permeation rates of the salts were in the range of (0.73 − 0.85) × 10 for (PAH-PSS) 5 and (PAH-PSS) 5 PAH films, respectively. Thus, permeability did not depend on the type of anion because the anions had smaller Stokes radii compared with the Na + ions [41,42]. These results also support the view that the permeation rate of alkali chlorides depends on the Stokes radii of the cationic species.…”

Chronopotentiometric study of a Nafion membrane in presence of glucose

“…The Stokes radius in aqueous electrolyte solutions for Na + and K + ions are 0.239 and 0.125 nm, respectively [34]. The presence of glucose affects the water structure near the sodium and potassium ions, and therefore, to their hydration sphere and the corresponding Stokes radius, implying an influence in the mobility of the ions.…”

“…Thus, for example, for an electrolyte concentration of 3 mol m -3 in absence of glucose, solvent uptake was 19.1 for NaCl, with a value of the ionic radius of 9.8 nm for the Na + ion, and 13.8 for KCl, where the K + ion has a higher ionic radius of 13.3 nm [34]. These results may be explained, based on the hydration properties of ions in the solutions, by means of a decrease of the Stokes radius when the ionic radius increases [34,42]. Therefore, the solvent uptake in the membrane depends on the hydration of ions, the more hydrated is the ion, the more are the solvent uptake and the surface expansion.…”

Study on the thermodynamics of bovine serum albumin aqueous solutions: experiments, modeling and molecular simulations.

“…BERG; MCMILLAN, 1990) and values of δ and ζ for alkali halides according to Equations (K.11) and (K.10) respectively. .…”

“…For simple ions that form alkali halides, these data are available in the literature (PAU; BERG; MCMILLAN, 1990). The coupling of Equations (7.24) and (7.25) is presented on Appendix K.…”