Permeabilities and selectivities in anisotropic planar membranes for gas separations

Selectivity of Transport Processes in Ion-Exchange Membranes: Relationship with the Structure and Methods for Its Improvement

“…As indicated by Park et al [ 83 ], all synthetic membranes exhibit a trade-off between permeability/conductivity (the rate of transfer of molecules and ions through a membrane material) and permselectivity (the ability to separate the target component from the feed solution): the higher membrane permeability, the lower permselectivity, and vice versa. For example, the well-known Robeson diagram illustrates this correlation for gas separation membranes [ 85 , 86 , 87 , 88 , 89 , 90 ].…”

Review of foundational concepts and emerging directions in metamaterial research: design, phenomena, and applications

“…55 However non-homogenous, anisotropic materials are extremely difficult to fabricate and manufacture so layers of homogeneous, isotropic material are used to achieve the desired anisotropic properties. Very few groups are working on MTMs 37,38,55,[230][231][232][233][234][235][236][237] and even fewer can successfully fabricate them because of the difficulties encountered. Improved coordinate transformation techniques for mass flow control are needed for this field to progress.…”

Impact of Interfaces on the CO2 Permeability of Photopatterned Two-Stage Thiolene Polymer Films

“…For example, a slanted grating patterns consisting of alternating polysulfone and polydimethylsiloxane (PDMS) can have an ideal O 2 /N 2 selectivity of ∼500 and 10 5 when the collection area size is 0.5 and 0.25 μm, correspondingly. 12 However, the contribution of the polymer−polymer interface is neglected in the studies.…”

“…These systems can be engineered using immiscible , and miscible , polymer blends, microphase-separated block copolymers, polymer composites with either permeable or impermeable − fillers, and multilayer films. , Often, the overall gas permeability is controlled by the morphology of these systems, specifically the connectivity and orientation of the most conductive phase. Recently, “meta” membrane systems with precise spatial arrangements of two different polymer components have been conceptualized computationally, inspired by the transformation optics, to guide the transport of different gas molecules to different locations. , Such a system, if realized, can have gas selectivity that is orders of magnitude higher than that of current membranes. For example, a slanted grating patterns consisting of alternating polysulfone and polydimethylsiloxane (PDMS) can have an ideal O 2 /N 2 selectivity of ∼500 and 10 5 when the collection area size is 0.5 and 0.25 μm, correspondingly .…”

“…Recently, "meta" membrane systems with precise spatial arrangements of two different polymer components have been conceptualized computationally, inspired by the transformation optics, to guide the transport of different gas molecules to different locations. 12,13 Such a system, if realized, can have gas selectivity that is orders of magnitude higher than that of current membranes. For example, a slanted grating patterns consisting of alternating polysulfone and polydimethylsiloxane (PDMS) can have an ideal O 2 /N 2 selectivity of ∼500 and 10 5 when the collection area size is 0.5 and 0.25 μm, correspondingly.…”