Solution-Diffusion with imperfections model applied to fluorinated-liquid infused membranes

Abstract

Supported liquid membranes have recently attracted a lot of attention in the field of gas separation. They are an innovation upon membranes, having improved separation performance over conventional membranes. Typically, membranes are infused with non-volatile liquids such as ionic liquids or deep eutectic solvents. The liquids chosen typically are good solvents for certain gases such as carbon dioxide, therefore attention is put towards using supported liquid membranes as a carbon capture technology. Most supported liquid membranes follow the solution-diffusion model, meanwhile conventional porous membranes follow the pore-flow model. However, in special cases of organic solvent nanofiltration, the
membranes are described by a combination of both models, the solution-diffusion with imperfections model. This work studies which model best applies to fluorinated liquid-infused membranes, known as slippery liquid-infused membranes, by measuring the permeability experimentally and comparing it with the theoretical permeability values obtained from experimental and theoretical solubility parameters.