Transport through composite membrane, part 1: Is there an optimal support membrane?

Influence of the porous support on diffusion in composite membranes

“…Our analysis suggests that the correlation is also applicable to porous supports with more realistic properties, such as random pore location and broader pore size 4 553 Composite Geometry distributions. The correlation is useful to evaluate the influence of the porous support on the permeance of composite membranes and shows that the effect can be significant in highperformance membranes.…”

“…In membrane terms, this means that the effective permeance of the composite membrane will be smaller than the intrinsic permeance (defined as the permeability coefficient, P, divided by H). The reduction in permeance is expressed by the restriction factor, Ψ, which is defined as follows: Ramon et al [4] were the first to apply CFD to the pore restriction problem. They calculated the restriction factor for 28 different combinations of porosity and top layer thickness normalized to the pore radius, using a square distribution of pores of equal size.…”

Improved performance of polyamide thin-film composite nanofiltration membrane by using polyetersulfone/polyaniline membrane as the substrate

“…In addition to adjusting the structure properties of the PA layer, physicochemical properties of the substrates also affect the separation performance of the PA TFC membrane [7,[14][15][16][17][18][19][20]. Polysulfone (PSf) or polyetersulfone (PES) porous support membranes, with surface pore sizes ranging from 1 nm to 300 nm, are frequently used as the substrates for the PA TFC membrane fabrication.…”

“…Recently, the impacts of substrate properties on the TFC membrane formation and resulting performance have been gaining attention, although limited research has been published. Several studies were conducted to investigate the correlation between the properties of substrates and the structure of the PA active layer [7,[14][15][16][17][18][19]. It is believed that the porous support membrane not only provides a mechanical layer for the TFC membrane but also influences the formation and structure of the PA layer.…”

“…It is believed that the porous support membrane not only provides a mechanical layer for the TFC membrane but also influences the formation and structure of the PA layer. The surface hydrophilicity, pore size and porosity of the substrate have a close relation with the thickness, roughness and cross-linking degree of the PA layer formed by interfacial polymerization [15,18]. Singh et al [21] investigated the effect of substrate surface pore size on the PA layer via interfacial polymerization of MPD and TMC on the surface of PSf substrates with average pore size distributions of 70 nm and 150 nm, respectively.…”