Self‐Generation of Surface Roughness by Low‐Surface‐Energy Alkyl Chains for Highly Stable Superhydrophobic/Superoleophilic MOFs with Multiple Functionalities

Abstract

We transformed the hydrophilic metal-organic framework (MOF) UiO-67 into hydrophobic UiO-67-Rs (R = alkyl) by introducing alkylc hains into organic linkers, which not only protected hydrophilic Zr 6 O 8 clusters to make the MOF interspace superoleophilic,b ut also led to ar ough crystal surface beneficial for superhydrophobicity.T he UiO-67-Rsd isplayed high acid, base,a nd water stability,a nd long alkylc hains offered better hydrophobicity.G ood hydrophobicity/oleophilicity were also possible with mixed-ligand MOFs containing metal-binding ligands.T hus,a(super)hydrophobic MOF catalyst loaded with Pd centers efficiently catalyzedS onogashira reactions in water at ambient temperature.S tudies of the hydrophobic effects of the coordination interspace and the outer surface suggest as imple de novo strategy for the synthesis of superhydrophobic MOFs that combine surface roughness and low surface energy.S uch MOFs have potential for environmentally friendly catalysis and water purification.

Biobased superhydrophobic coating enabled by nanoparticle assembly

“…The results are consistent with prior observations that surface roughness will enhance the hydrophobicity. 63–66 Further experiments demonstrate the importance of particle size, loading, and silane treatment. The results of these studies reveal that high loading of small particles promotes the best water repellency (Fig.…”

Constructing Nanocaged Enzymes for Synergistic Catalysis of CO2 Reduction

“…The pores of CSH contain hydrophobic groups (‐CH 3 ), and the pores of FDH@ZIF‐90 contain hydrophilic groups (—OH). [ 18 ] The water adsorption values of CSH and FDH@ZIF‐90 are 1.5 and 7.0 mmol g −1 , respectively (Figure S4 , Supporting Information). The CSH could adsorb N 2 (165.8 cm 3 g −1 ), which is more than FDH@ZIF‐90 (29.2 cm 3 g −1 ) (Figure S5 , Supporting Information).…”

Palladium‐Based Metal Organic Frameworks as Heterogeneous Catalysts for C−C Couplings

“…Zhu et al introduced extra-long hydrophobic alkyl chains in the biphenyl ring of the UiO-67 MOF, close to coordination environment of the hydrophilic Zr 8 O 8 metal-oxoclusters, resulting in superhydrophobic/oleophilic MOFs with the same crystallinity to the pristine MOF (see Figure 3). [69] The BET surface area decreased from 1303 to 349 m 2 g À 1 as the alkyl chain increased from C 2 to C 8 , values much lower than pristine UiO-67 (2761 m 2 g À 1 ), although the pore sizes were similar (ca. 1.1 nm).…”