Diffusion in and permeation through coating materials

Diffusion through Porous Media: Ultrafiltration, Membrane Permeation and Molecular Sieving

This paper considers permeation through microporous or nanoporous inorganic membranes under the influence of an applied pressure gradient. In general membrane permeation may be considered as a diffusive process, driven by the gradient of chemical potential (which depends on both composition and pressure). The relative importance of these two factors varies greatly for different types of system....

Coating Materials

Permeation of multifunctional acrylates through selected protective glove materials.

In support of the Premanufacture Notification (PMN) program of the Environmental Protection Agency's Office of Toxic Substances, the resistance of three glove materials to permeation by multifunctional acrylate compounds was evaluated through a program for the Office of Research and Development. Several recent PMN submissions relate to multifunctional acrylates and essentially no permeation dat...

Collective diffusion model for water permeation through microscopic channels.

Water permeation through nanometric channels, generally a coupled many-body process, is described in this study by a single collective coordinate. A collective diffusion model is proposed in which water movement at equilibrium is characterized as an unbiased diffusion along this coordinate and water transport in the presence of a chemical potential difference is described as one-dimensional dif...

Permeation and self-diffusion in smectics A

2014 Recent R.M.N. and quasi-elastic neutron scattering experiments on smectics A have given comparable values for the self-diffusion coefficients D~ (diffusion normal to the layers) and D~, in spite of the possible occurence of a permeation process which would lead to much lower values for D ~. It is shown that there is no permeation in a self-diffusion experiment, and therefore that the Einst...