期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 3, 期 4, 页码 1737-1742出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ta06396a
关键词
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资金
- Trinity Hall
- IWT (MOF Shape)
- KU Leuven
- Research Foundation - Flanders (FWO)
The ability to retain structural integrity under processing conditions which involve mechanical stress, is essential if metal-organic frameworks (MOFs) are to fulfil their potential as serious candidates for use in gas sorption, separation, catalysis and energy conversion applications. A series of zirconium dicarboxylates, predicted to be amongst the more mechanically robust MOFs, have been found to undergo rapid collapse upon ball-milling, resulting in catastrophic losses of porosity. An inverse relationship between collapse time and framework porosity has been found. Addition of acidic modulator ligands (e.g. trifluoroacetic acid) to UiO-66 provided a striking increase in mechanical robustness, the degree of which is inversely related to modulator pK(a). This effect, caused by an increased strength of the zirconium-carboxylate bond, provides an important concept to design microporous hybrid frameworks capable of retaining their structure under harsh processing conditions.
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