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Freeze Drying Significantly Increases Permanent Porosity and Hydrogen Uptake in 4,4‐Connected Metal–Organic Frameworks
Author(s) -
Ma Liqing,
Jin Athena,
Xie Zhigang,
Lin Wenbin
Publication year - 2009
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.200904983
Subject(s) - porosity , sublimation (psychology) , materials science , boiling , metal organic framework , boiling point , mesoporous material , chemical engineering , hydrogen , surface tension , metal , benzene , composite material , metallurgy , chemistry , adsorption , organic chemistry , thermodynamics , psychology , physics , engineering , psychotherapist , catalysis
Freeze the flood : After replacing high boiling‐point solvents inside the channels of a metal–organic framework (MOF), benzene is frozen and then removed under vacuum by sublimation. Bypassing the liquid phase eliminates the detrimental effects of surface tension that induce mesopore collapse in MOFs, thereby enhancing their permanent porosity and hydrogen‐uptake capacity (see scheme).