Permeability of Polymer Membranes beyond Linear Response

On the Effective Permeability of Mixed Matrix Membranes

Mixed matrix membranes (MMMs) are attracting significant interest for pervaporation and gas separation applications. To better comprehend the impact of filler particles within polymer matrices, the species permeation mass transport was theoretically studied by numerical simulation using finite differences. The Fick’s second law of diffusion was solved for a three-dimensional MMM to obtain the c...

Ring polymer molecular dynamics beyond the linear response regime: Excess electron injection and trapping in liquids.

Ring polymer molecular dynamics (RPMD) is used to directly simulate the injection and relaxation of excess electrons into supercritical helium fluid and ambient liquid water. A method for modulating the initial energy of the excess electron in the RPMD model is presented and used to study both low-energy (cold) and high-energy (hot) electron injections. For cold injection into both solvents, th...

Potentiometric pH response of polymer membranes incorporated with ion-exchangers.

Permeability properties of lysosomal membranes.

Lysosomes are involved in the cellular degradation of material either initially present in the cell or brought into the cell by phagocytosis or endocytosis. This degradative process, which occurs in an acidic environment, produces metabolites such as peptides and amino acids~ nucleos ides , and sugars which may subsequently accumulate within the lysosome. It is therefore important for osmotic r...

Studies on Permeability of Membranes

A STUDY OF THE BEHAVIOR OF THE DRIED COLLODION MEMBRANE TOWARD THE BIVALENT CALCIUM ION SHOWED THAT: 1. There is almost no potential difference established across a membrane separating two calcium chloride solutions of 0.1 and 0.01 N concentrations. 2. The transfer numbers of chlorine and calcium, as measured in electrical transfer experiments, are both close to 0.5. 3. A sample of membrane in ...