Effect of Electrolyte Concentration on the Viscosity and Voltammetry of Supercritical Solutions

• Published in: Analytical chemistry (Washington) Vol. 77; no. 20; pp. 6702 - 6708
• Main Authors: Abbott, Andrew P, Hope, Eric G, Palmer, Donna J
• Format: Journal Article
• Language: English
• Published: Washington, DC American Chemical Society 15-10-2005
• Subjects: Analytical chemistry; Borates - chemistry; Calibration; Chemistry; Crystal structure; Electrochemical methods; Electrochemistry; Electrodes; Electrolytes - chemistry; Exact sciences and technology; Ferrous Compounds - chemistry; General, instrumentation; Hydrocarbons, Fluorinated - chemistry; Ions; Metallocenes; Quartz - chemistry; Quaternary Ammonium Compounds - chemistry; Solutions - chemistry; Viscosity; Viscosity; Solvation; Electrolyte solution; Concentration effect; Lead; Voltammetry; Quartz microbalance
• ISSN: 0003-2700; 1520-6882
• DOI: 10.1021/ac050883i

The viscosity of a supercritical electrolyte solution is measured for the first time using a modified quartz crystal microbalance, and it is shown that ionic solvation leads to a significant structuring of the solvent and an appreciable increase in solution viscosity. Voltammetric investigations in the electrolyte solutions are used to confirm the magnitude of the viscosity changes, and these account for the appreciably lower than expected peak currents.