Author/Authors :
Sannomiya, A. Tokyo Metropolitan University - Department of Applied Chemistry, Japan , Iwase, M. Tokyo Metropolitan University - Department of Applied Chemistry, Japan , Nagaoka, S. Tokyo Metropolitan University - Department of Applied Chemistry, Japan , Suzuki, Y. Institute of Physical and Chemical Research, Japan , Iwaki, M. Institute of Physical and Chemical Research, Japan , Kawakami, H. Tokyo Metropolitan University - Department of Applied Chemistry, Japan
Abstract :
In this study, the gas permeance and selectivity of the asymmetric polyimide membrane with skin layer carbonized by He ions irradiation were measured using a high vacuum apparatus with a Baratron absolute pressure gauge at 76 cmlfg and 35°C. Particularly, we focused on the effects of the depth profile of the energy loss for the irradiating He ions in the skin layer on the gas permeation properties of the asymmetric membranes. Irradiation depth is gauged through the energy loss profile of the irradiating ions. The nature of the carbonised layer was investigated using AFM and ATR-FTIR. We demonstrated that the P02 of the He+-irradiated membranes increased with the skin layer thickness and that the depth of the irradiating ions in the skin layer had a significant influence on the gas permeability and selectivity of the asymmetric membrane.
Keywords :
Asymmetric polyimide membrane , ion , beam irradiation , He ion , gas permeation property , gas separation
