Liquid Viscosity and Surface Tension of -Hexane, -Octane, -Decane, and -Hexadecane up to 573 K by Surface Light Scattering (SLS).

In the present study, the simultaneous and accurate determination of liquid viscosity and surface tension of the -alkanes -hexane (-CH), -octane (-CH), -decane (-CH), and -hexadecane (-CH) by surface light scattering (SLS) in thermodynamic equilibrium is demonstrated. Measurements have been performed over a wide temperature range from 283.15 K up to 473.15 K for -CH, 523.15 K for -CH, and 573.15 K for -CH as well as -CH. The liquid dynamic viscosity and surface tension data with average total measurement uncertainties ( = 2) of (2.0 and 1.7) % agree with the available literature and contribute to a new database at high temperatures. Over the entire temperature range, a Vogel-type equation for the dynamic viscosity and a modified van der Waals equation for the surface tension represent the measured data for the four -alkanes within experimental uncertainties. By also considering our former SLS data for -dodecane (-CH) and -octacosane (-CH), empirical models for the liquid viscosity and surface tension of -alkanes were developed as a function of temperature and carbon number covering values between 6 and 28. Agreement between these models and reference correlations for further selected -alkanes which were not included in the development procedure was found.