Hydrogen bond fluctuations and dispersive interactions of alcohol/alkane mixtures. An ultrasonic relaxation study

► Wait-and-switch model of alcohol dipole orientation is confirmed. ► Spectra indicate a micro-heterogeneous structure of alcohol-alkane mixtures. ► Hydrophobic interactions contribute to the activation enthalpy of alcohols. ► Gibbs energy of chain isomerisation reveals minimum at mole fraction 0.5.