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- W1985815287 abstract "Stimuli-responsive gas permeation membranes hold substantial potential for industrial processes as well as in analyticaland screening applications. Such smart membrane systems, although prevalent in liquid mass-transfer manipulations,have yet to be realized for gas applications. We report our progress in developing gas permeation membranes in whichliquid crystalline (LC) phases afford the active region of permeation. To achieve rapid and reversible switching betweenLC and isotropic permeation states, we harnessed the photomechanical action of mesogenic azobenzene dyes that canproduce isothermal nematic-isotropic transitions. Both polymeric and low-molecular-weight LC materials were tested.Three different dye-doped LC mixtures with mesogenic azo dyes were infused into commercially available track-etchedporous membranes with regular cylindrical pores (0.4 to 10.0 μm). Photoinduced isothermal phase changes in theimbibed material produced large and fully reversible changes in the permeability of the membrane to nitrogen with 5 s ofirradiation at 2 mW/cm 2 . Using two measurement tools constructed in-house, the permeability of the photoswitchedmembranes was determined by both variable-pressure and variable-volume methods. Both the LC and photogeneratedisotropic states demonstrate a linear permeability/pressure (ideal sorption) relationship, with up to a 16-fold difference intheir permeability coefficients. Liquid crystal compositions can be chosen such that the LC phase is more permeable thanthe isotropic-or vice versa. This approach is the first system offering reversible tunable gas permeation membranes." @default.
- W1985815287 created "2016-06-24" @default.
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- W1985815287 date "2010-08-19" @default.
- W1985815287 modified "2023-09-26" @default.
- W1985815287 title "Photoswitchable gas permeation membranes based on azobenzene-doped liquid crystals II. Permeation-switching characterization under variable volume and variable pressure conditions" @default.
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- W1985815287 doi "https://doi.org/10.1117/12.860635" @default.
- W1985815287 hasPublicationYear "2010" @default.
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