Fig. 4: Temperature-dependence of the isothermal compressibility κ_T.

A Isothermal compressibility, κ_T, of glycerol-water solutions (χ_g = 3.2% glycerol mole fraction, black open circles) calculated from the structure factor obtained using the femtosecond X-ray scattering (SAXS). Also included is the κ_T of pure water from the SAXS experiments reported in ref. ⁷ (open red triangles). Solid lines are power-law fits to the data using Eq. (2)⁵⁵ (see also Table 1). B The κ_T(T) of the glycerol-water solution (χ_g = 3.2% glycerol mole fraction, black open circles) and pure TIP4P/2005 water obtained from MD simulations (open red triangles²¹ and squares⁸⁶). A maximum in κ_T(T) is found in the MD simulations of both pure TIP4P/2005 water (T = 234 K) and glycerol-water solutions (T = 223 ± 1 K). The solid lines are spline interpolations to the data. Note the difference in the scale of the x and y axis between the panels. Error bars indicate the standard error.