Geometric restriction of microporous supports on gas permeance efficiency of thin film composite membranes

Lithium chloride (LiCl)-modified polyethersulfone (PES) substrate surface pore architectures on thin poly(dimethylsiloxane) (PDMS) dense layer formation and the composite membrane's performance in gas separation

“…This theoretical correlation has been proven and modied by A. Ghadimi et al (2018) to further improve the estimation's precision by incorporating pore density into the equation and was later veried with PES based substrate of different pore sizes and porosities. 4 Based on the literature evaluation of the inuence of porous substrate's surface pore architectures on the composite membrane formation and performance, minimal lateral diffusion can be achieved by substrates with high surface porosity and pore density but low surface pore sizes.…”

“…Notwithstanding the similarity, layers of TFC are fabricated separately, allowing the fabricators to have better control of the layers suited to their specic functions. 4 On the other hand, separated layer fabrication methodology can allow the use of more expensive materials in the separating layer in a localized structure instead of being dispersed throughout the whole membrane. With a thinner selective layer, higher permeance value can also be achieved for highly selective polymers, which are normally permeability limited by their intrinsic physical characteristics (reduction in diffusion coefficient with tighter molecular spacing for highly selective polymer), as explained in the wellknown Robeson upper bound limits.…”

“…Ghadimi et al (2018) to further improve the estimation's precision by incorporating pore density into the equation and was later veried with PES based substrate of different pore sizes and porosities. 4 Based on the literature evaluation of the inuence of porous substrate's surface pore architectures on the composite membrane formation and performance, minimal lateral diffusion can be achieved by substrates with high surface porosity and pore density but low surface pore sizes. 4,8,13 On the other hand, similar characteristics can increase the effect of pore penetration by capillary action and surface wetting, depending on the chemistry of the coating solution and its underlying substrate.…”

Prospect of Oxyplus Hollow Fibre Membrane with Dense Polymethylpentene (PMP) Skin as Support-gutter Layer of Thin Film Composite (TFC) for Biogas upgrading

“…Nevertheless, composite membranes such as thin film composite (TFC) have the added benefit for better control of the membrane layers to its specific functions, on top of allowing the use of more expensive materials (usually in the separating layer) in a thin, localised structure instead of being used for the whole membrane. 4 Through the utilisation of TFC, higher permeance value can be achieved for highly selective, usually specialised polymer layer, which are normally grounded by its intrinsic physical limitation (reduction in diffusion coefficient with tighter molecular spacing) as explained by the Robeson upper bound limits. 2,3 The increase in permeance are fundamental as noted in the volume flux equation for gas separation in dense membranes: 1…”

“…Lateral diffusion at the composite interface. [4][5][6] 2. Impregnation of selective layer solution into the porous support.…”