a Statistical-Mechanical Energy Barrier Model for Permeation Through Monomolecular Films.
Abstract
The effect of adsorbed surfactant monolayers on interfacial mass transport processes has been studied by modelling the monolayer as a hard disc fluid with the diffusing species as permeating hard spheres. Results of the hard disc-hard sphere model are discussed in terms of Barnes' mechanical analogue and with respect to experimental data for permeation through long chain paraffin alcohol and acid monolayers. In a system of 1024 monolayer particles the probabilities for hard spheres permeating the hard disc membrane were found to vanish at monolayer densities well below close packing. Experimental mass transfer coefficients of the order of the 0.1 cm/per sec can now be interpreted as indicating structural defects in the monolayer conformation at densities lower than the macroscopic crumple point.
- Publication:
-
Ph.D. Thesis
- Pub Date:
- 1976
- Bibcode:
- 1976PhDT........65M
- Keywords:
-
- Physics: Molecular;
- Interfacial Energy;
- Mass Transfer;
- Monomolecular Films;
- Permeability;
- Statistical Mechanics;
- Surface Layers;
- Surface Properties;
- Surfactants;
- Solid-State Physics