The EPA setup is made of a spectroscopic ellipsometer on which is fixed a cell of environment control containing the film to analyze. In laboratories, gas volumetry analyses are usually time-consuming, mainly because of long pressure equilibration time within the analysis chamber. In the experimental setup of these experiments, we replaced the pressure equilibration system by a continuous flux of air containing a fixed partial pressure of adsorbate directly in contact with the mesoporous film to analyze.
EPA gives access to:
- Pore size Distribution from 1.5nm to 60 nm diam
- Average pore size
- Cumulative surface area
- Thickness – refractive index – absorption coefficients
- Young Modulus