Abstract
The viscosities of aqueous solutions of tetraalkylammonium bromide (R4NBr;R=Me, Et, n-Pr, and n-Bu) were measured in the range of 0.1-1.0molkg-1 and 5.0-50.0°C respectively up to a pressure of 375MPa, using a high pressure rolling-ball viscometer. The activation energy for viscous flow (Ev) and Jones-Dole B coefficient were estimated The viscosity vs. pressure minimum at 5.0°C observed for pure water becomes shallow or disappears with increasing concentration of R4NBr salt and increasing temperature. Ev for aqueous solution of Me4NBr is lower than that of pure water in the whole concentration range under high pressure. Two types of the pressure dependence of the Jones-Dole B coefficients are given. These phenomena were interpreted based on the stand point of pressure, temperature, concentration effects for the structure of water.
