4-Methylnonane

Study on Viscosity and Surface Tension of Branched Alkanes such as 4-Methylnonane

Klein, Tobias, et al. Journal of Chemical & Engineering Data, 2018, 63(8), 2833-2839.

This study used 2-methylnonane and 4-methylnonane branched isomers of n-dodecane as model systems to examine how alkane branches with identical molecular weights affect specific thermophysical properties.
Research Methods
Near saturation conditions surface light scattering (SLS) measurements produced surface tension and liquid dynamic viscosity results with average relative expanded uncertainties of 1.5 % and 0.9 % (k = 2). Researchers applied two vibrating-tube densimeters to measure liquid density at atmospheric pressure and they obtained relative expanded uncertainties ranging from 0.01 to 0.5 % with a coverage factor of 2.
Key Findings
· The current research presents accurate experimental results (referenced in the table) for the liquid dynamic viscosity and surface tension and liquid density of 2-methylnonane and 4-methylnonane branched alkanes.
· The effects of branching location on thermophysical property data are analyzed in this study. The experimental σ-values for 2-methylnonane show relative deviations ranging from -0.5 to -2.0% when compared to 4-methylnonane. The location of the branched methyl group does not significantly affect the surface tensions in C10H22-based systems according to the study.