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Metal–Organic Framework Materials with Ultrahigh Surface Areas: Is the Sky the Limit?

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posted on 12.09.2012, 00:00 by Omar K. Farha, Ibrahim Eryazici, Nak Cheon Jeong, Brad G. Hauser, Christopher E. Wilmer, Amy A. Sarjeant, Randall Q. Snurr, SonBinh T. Nguyen, A. Özgür Yazaydın, Joseph T. Hupp
We have synthesized, characterized, and computationally simulated/validated the behavior of two new metal–organic framework (MOF) materials displaying the highest experimental Brunauer–Emmett–Teller (BET) surface areas of any porous materials reported to date (∼7000 m2/g). Key to evacuating the initially solvent-filled materials without pore collapse, and thereby accessing the ultrahigh areas, is the use of a supercritical CO2 activation technique. Additionally, we demonstrate computationally that by shifting from phenyl groups to “space efficient” acetylene moieties as linker expansion units, the hypothetical maximum surface area for a MOF material is substantially greater than previously envisioned (∼14600 m2/g (or greater) versus ∼10500 m2/g).