期刊
CHEMICAL SOCIETY REVIEWS
卷 45, 期 12, 页码 3468-3478出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5cs00597c
关键词
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资金
- European Union Seventh Framework Programme (FP7) [608490]
- Sino German Center for Research promotion [GZ676, GZ911]
Thin films of a few mu m thickness for particle filtration and gas separation cannot be applied as self-supporting layers since they are mechanically insufficiently strong. Therefore, these top layers for particle filtration and gas separation are usually deposited on porous mechanically strong supports with a hierarchical pore structure. To reduce the pressure drop of a gas stream over the membrane and to ensure high fluxes in filtration and gas separation, the cross section of the support is usually asymmetric or graded with a small thickness of the layer with the smallest pore size called the top layer. Since the pressure drop over a capillary with radius r is similar to r(4), the layer with the smallest pore size should be as thin as possible. The disk-like planar supports are usually prepared by sequential tape casting which is an expensive technology. Tubular supports with a hierarchical cross section can be prepared in one step by hollow fiber spinning, double mantle spinning or centrifugal casting.
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