Premium
Smart Metal‐Organic Frameworks (MOFs): Switching Gas Permeation through MOF Membranes by External Stimuli
Author(s) -
Knebel Alexander,
Zhou Chen,
Huang Aisheng,
Zhang Jian,
Kustov Leonid,
Caro Juergen
Publication year - 2018
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.201700635
Subject(s) - permeation , membrane , metal organic framework , propane , moiety , polymer , chemical engineering , adsorption , dipole , propene , molecular switch , ionic bonding , materials science , chemistry , organic chemistry , molecule , catalysis , ion , biochemistry , engineering
The switching of gas permeation and adsorption on polymers, zeolites, and metal‐organic frameworks (MOFs) by external stimuli like temperature, pressure, light, and electric fields is discussed. Especially MOFs as soft porous crystals are suitable candidates for switching gas transport. If the linker of a MOF contains a cis‐trans switchable azo moiety, switching of the trans state into the cis state reduces gas transport through a MOF membrane. On the other hand, MOFs with dipolar or ionic components can be switched upon polarization with an electric field into polymorphs of the starting MOF. A ZIF‐8 membrane can be switched into a polymorph with a rather stiff lattice, which sharpens the molecular sieving effect of the membrane, and, as an example, the propene/propane selectivity increases.