Fluorocarbon amphiphiles (C3FC2COOH, 2C3FC3-de-C2N+) formed surface monolayers at 21°C on aqueous BaCl2 (for C3FC2COOH) and on pure water (for 2C3FC3-de-C2N+). These monolayers could be deposited on solid substrates covered by layers of stearic acid, only as a single layer for the Ba salt of C3FC2COOH and up to ten layers (the Z type) for 2C3FC3-de-C2N+. Direct deposition without layers of stearic acid was not possible. The gas flux of oxygen (RO2) and nitrogen (RN2) through these multilayer membranes was drastically reduced at certain thicknesses of the layer of stearic acid, and the value of RO2/RN2 concomitantly became larger than unity. RO2/RN2 depended on the number of fluorocarbon layers, and the maximum value of RO2/RN2 was 1.7 (RO2=7 × 10-5 cm3(STP)cm-2.s-1.cmHg-1).
All Science Journal Classification (ASJC) codes
- Chemical Engineering (miscellaneous)
- Materials Science (miscellaneous)
- Environmental Science(all)
- Polymers and Plastics