6533b824fe1ef96bd12815b0
RESEARCH PRODUCT
Thermodiffusion of sodium polystyrene sulfonate in a supporting electrolyte
Miikka JokinenJosé A. ManzanaresLasse Murtomäkisubject
Materials scienceSupporting electrolyteGeneral Chemical EngineeringSodiumThermodynamicschemistry.chemical_elementNon-isothermal processSoret effect02 engineering and technologyElectrolyteThermodiffusion010402 general chemistry01 natural scienceschemistry.chemical_compoundFlux (metallurgy)Electrochemistryta116Time evolutionPolyelectrolyte021001 nanoscience & nanotechnologyPolyelectrolyte0104 chemical sciencesSulfonatechemistry0210 nano-technologySodium Polystyrene Sulfonatedescription
Thermodiffusion, or the Soret phenomenon, is well understood in simple systems, but in multicomponent and polyvalent electrolyte systems the process becomes more complicated due to the coupling of fluxes. We experimentally investigate the time evolution of a concentration gradient generated by thermodiffusion of a polyelectrolyte (poly(sodium 4-styrene sulfonate), NaPSS) in a 1:1 supporting electrolyte. We also derive and solve the transport equations that are used to extract the Soret coefficient from the experimental observations. It is shown that NaPSS thermodiffusion in NaCl is strongly dependent on concentration, with almost 100% thermal separation in concentrations below 15 nmol L−1. Moreover, the results suggest that the supporting electrolyte can greatly influence the thermodiffusion of the polyelectrolyte, in some cases possibly even reversing the direction of the flux from the usual case of enrichment at the cold side. Peer reviewed
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2019-09-01 | Electrochimica Acta |