Inelastic neutron scattering study of dynamical properties of bioprotectant solutions against temperature

In this work inelastic neutron scattering (INS) collected at different temperature values by the IN4 and IN6 spectrometers at the Institute Laue Langevin (ILL, Grenoble, France) on mixtures of two glass-forming bioprotectant systems, i.e. trehalose and glycerol, as a function of concentration are presented. The data analyses show that in the investigated mixtures the fast local dynamics, measured by INS, exhibits a switching-off maximum at very low glycerol content both at very low and very high temperature. This effect can be accounted for by a not-ideal mixing process of the pure constituents which gives rise to an increased hydrogen bonding network strength.