Tunable molecular separation by nanoporous membranes

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Wang, Z.; Knebel, Alexander; Grosjean, S.; Wagner, D.; Bräse, S. et al.: Tunable molecular separation by nanoporous membranes. In: Nature Communications 7 (2016), Nr., 13872. DOI: https://doi.org/10.1038/ncomms13872

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Sum total of downloads: 125

Metal-organic frameworks offer tremendous potential for efficient separation of molecular mixtures. Different pore sizes and suitable functionalizations of the framework allow for an adjustment of the static selectivity. Here we report membranes which offer dynamic control of the selectivity by remote signals, thus enabling a continuous adjustment of the permeate flux. This is realized by assembling linkers containing photoresponsive azobenzene-side-groups into monolithic, crystalline membranes of metal-organic frameworks. The azobenzene moieties can be switched from the trans to the cis configuration and vice versa by irradiation with ultraviolet or visible light, resulting in a substantial modification of the membrane permeability and separation factor. The precise control of the cis:trans azobenzene ratio, for example, by controlled irradiation times or by simultaneous irradiation with ultraviolet and visible light, enables the continuous tuning of the separation. For hydrogen:carbon-dioxide, the separation factor of this smart membrane can be steplessly adjusted between 3 and 8.
License of this version: CC BY 4.0 Unported
Document Type: article
Publishing status: publishedVersion
Issue Date: 2016
Appears in Collections:Naturwissenschaftliche Fakultät

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pos. country downloads
total perc.
1 image of flag of Germany Germany 106 84.80%
2 image of flag of United States United States 6 4.80%
3 image of flag of Russian Federation Russian Federation 2 1.60%
4 image of flag of Netherlands Netherlands 2 1.60%
5 image of flag of Malaysia Malaysia 1 0.80%
6 image of flag of Mexico Mexico 1 0.80%
7 image of flag of Kenya Kenya 1 0.80%
8 image of flag of Iran, Islamic Republic of Iran, Islamic Republic of 1 0.80%
9 image of flag of India India 1 0.80%
10 image of flag of China China 1 0.80%
    other countries 3 2.40%

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