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• W3208669706 abstract "Porous carbon films, attributed to their superior thermal and chemical robustness, are attractive for a number of applications. In the context of molecular separation, a major focus has been on films where the effective pore diameter is lower than 1 nm, e.g., carbon molecular sieves. Only a handful of reports are available on carbon films hosting 2–3 nm size pore channels where gas transport mainly takes place by Knudsen diffusion in contrast to activated transport. Recently, we reported nanoporous carbon (NPC) films, by the pyrolysis of phase-separated block-copolymer/turanose films, as a gas-permeable mechanical reinforcement for crack-free synthesis of single-layer graphene membranes. However, a dedicated study on the nanostructure and transport properties of the standalone NPC film has been missing. Herein, we show that the NPC film has a perforated lamellar (PL) nanostructure where molecular transport is limited by an interlamellar spacing of ∼2 nm. The unique PL nanostructure of the NPC film originates from its precursor, i.e., a block-copolymer stabilized by hydrogen bonding with a carbohydrate additive, where the latter also acts as the main carbon-forming agent. This nanostructure is highly sensitive to the carbohydrate/block-copolymer ratio and gives way to a lacey structure below a ratio of 2:1. The transport of gases through the interlamellar spacing takes place predominantly in the Knudsen regime, determined by their molecular mass. Attributed to a thickness of 100 nm, the film yields extremely rapid gas transport with a H2 permeance over two million gas permeation units (GPU) and H2/CO2 selectivity over 4.5 in a temperature range of 25–300 °C. These properties make the NPC film a promising membrane support and a good choice for the mechanical reinforcement for high-permeance two-dimensional membranes for gas separation." @default.
• W3208669706 created "2021-11-08" @default.
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• W3208669706 date "2021-10-28" @default.
• W3208669706 modified "2023-09-30" @default.
• W3208669706 title "Rapid Gas Transport from Block-Copolymer Templated Nanoporous Carbon Films" @default.
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• W3208669706 doi "https://doi.org/10.1021/acs.iecr.1c03039" @default.
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