✍ Scribed by Wolffram Schröer
No coin nor oath required. For personal study only.
The local amplitude of an applied electric field polarizing a fluid comprising non-spherical molecules has components whrch depend on the average polarization of the sample and fluctuate with the molecular orientation. In isotropic fluids only the contraction of these fluctuations with the anisotropic part of the molecular polarisability gives a non-vanishing contribution to the dielectric polarization. In anisotropic fluids the angular average of these fluctuations of the electric field ls non-vanishing and is of the same order of magnitude as the Lore& field correction to the electric field. It contributes in all orders of the density to the dielectric virial expansion and to the molar coefficients of induced blrefringence. It can serve as an explanation for thepbservation that tire local field factor which best describes the density dependence of the Cotton-Mouton effect of COa is g (e + 2) and not [J (e + 2)12, as required by the classical Born-Langevin theory.
📜 SIMILAR VOLUMES
The dielectric polarization and its change in an external electric fie!d were mezured for diosane-water dikted solutions up to 0.3 molar fraction of water. The results were found to be qualitatively similar to those previousIy observed for dioxane-alcohols mixtures.
It is demonstrated from vapour-pressure osmometric data on solutions of phosphatidylcholine in benzene in the concentration range 0.015-0.08 mole/1 that under these conditions PC forms aggregates of about 15 molecules. From dielectric measurements it follows that in these aggregates the dipoles of t