A mean field analysis of the static dielectric behavior of linear lower alcohols

摘要

The static dielectric responses of methanol,ethanol,and 1-propanol up to 1-hexanol are discussed in terms of a stiff-chain lattice model for the alcohol clusters.An analytical expression for the Kirkwood correlation factor g_K is derived in terms of the canonical partition function associated to the configurational statistics of any of the dimers building up a chain.This allows for the estimate of the dipole moment mu_O of an alcohol molecule in the liquid phase from the temperature dependence of the dielectric constant.All alcohol species appear to be characterized by a dipole moment larger than in the vapor phase.The Kirkwood correlation factor is found to be an increasing function of the alkyl tail length.