Fig. 2: Membrane air permeability relationship to key membrane parameters.
The experimental relationship between dry-air permeability (LMH or liters per m2 per hour for volumetric, kg per m2 per hour for mass) and a the inverse of membrane thickness via PVDF400 stacking with no spacing in between membranes to increase thickness (blue circles with blue dashed line) and b pore radius (via Durapore membranes with varying pore size) for water-filtration membranes (blue circles with blue dashed line). c Experimentally-determined linear relationship between air permeability and a global parameter for membrane variables (black dashed line). All membranes used displayed hydrophilic behavior (orange circle for PVDF400, green triangle for Durapore-100 nm, dark blue invert pyramid for Durapore-220 nm, gray square for Isopore-200 nm, purple diamond for PVDF400-Double Layer and light blue pentagon for PVDF400-Triple Layer). PVDF400 flows are at normal orientation. Data was collected via dry-air-filtration (0% relative humidity) using in-line flow cell with an area of 9.23 cm2. Measured flow rate measurements normalized at STP. Error bars represent the standard deviation of 3 different measurements taken on the samples.
