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Multicomponent Diffusion in Crowded Solutions. 2. Mutual Diffusion in the Ternary System Tetra(ethylene glycol)-NaCl-Water
 

Summary: Multicomponent Diffusion in Crowded Solutions. 2. Mutual Diffusion in the Ternary
System Tetra(ethylene glycol)-NaCl-Water
Alessandro Vergara, Onofrio Annunziata, Luigi Paduano, Donald G. Miller,
John G. Albright, and Roberto Sartorio*,
Dipartimento di Chimica, UniVersita` di Napoli "Federico II", Monte S. Angelo,
Via Cinthia, 80126 Napoli, Italy, Center for Materials Science and Engineering, Massachusetts
Institute of Technology, Cambridge, Massachusetts 02139, Lawrence LiVermore National Laboratory,
LiVermore, California 94551, and Department of Chemistry, Texas Christian UniVersity,
Fort Worth, Texas 76129
ReceiVed: July 29, 2003; In Final Form: October 20, 2003
Multicomponent diffusion properties for the tetra(ethylene glycol) (PEG4)-sodium chloride-water ternary
system are investigated at constant salt concentration (0.5 mol dm-3
) and a wide range of PEG4 concentration
approaching 3.0 mol dm-3
(60% volume fraction). Cross-velocity correlation (counterflows) for any pair of
components in this ternary system is determined. Comparison between the exact multicomponent approach
and the pseudobinary approximation, which is based on the assumption that the PEG4-water mixed solvent
can be treated as one component, shows how the latter approach is misleading in describing the electrolyte
diffusion properties in mixed solvents. Our results show strong coupling between the fluxes of NaCl and
PEG4, which is attributed to the NaCl-PEG4 nonpreferential interactions in water. Moreover, the behavior

  

Source: Annunziata, Onofrio - Department of Chemistry, Texas Christian University

 

Collections: Chemistry