Barrier membranes with aligned inorganic flakes have permeabilities which are dramatically lower perpendicular to the flakes than parallel to the flakes. Electrical conductivity measurements in membranes swollen in aqueous ionic solutions show this anisotropic permeability is consistent with theories of transport in these barriers.
Bibliographical noteFunding Information:
This work was largely supported by the Air Force Office of Scientific Research (grant F49620-01-1-0333). Other support came from the Department of Energy (grant DE-FG07-02ER63509), the Petroleum Research Fund (grant 39083-AC9), and the National Science Foundation (grant CTS 03225882).
- Barrier membranes