Metal–Organic Framework Colloids: Disassembly and Deaggregation

Abstract

We demonstrate a high-resolution method as an efficient tool to in situ characterize partially reversible assembly and aggregation of metal-organic framework (MOF) colloids. Based on the gas-phase electrophoresis, the primary size and the degree of aggregation of the MOF-525 crystals are tunable by pH adjustment and mobility selection. These findings allow for the further size control of MOF colloids and prove the capability of semiquantitative analysis for the MOF-based platforms in a variety of aqueous formulations (e.g., biomedical applications).

Experimental evidence for a general model of modulated MOF nanoparticle growth

“…4). Previous reports have shown that pH adjustment can manipulate the assembly and aggregation of MOF-525 particles 44,45 and that strongly acidic modulators improve the colloidal stability of UiO-66. 38 More generally, the seesaw model serves as a complement to well-established models of bulk crystal growth and polymer formation.…”

Direct arylation of benzoazoles with aldehydes utilizing metal–organic framework Fe3O(BDC)3 as a recyclable heterogeneous catalyst

“…Metal-organic frameworks (MOFs) have sprung up as a new type of crystalline material, assembled by appending metal ions or metal clusters with organic connecting linkers. [14][15][16][17] It is possible to regulate the characteristics of MOFs by integrating diverse metal cations with varied organic components. [18][19][20] The temperament of MOFs results in different advantages as correlated to customary inorganic materials.…”

Experimental Evidence for a General Model of Modulated MOF Nanoparticle Growth

“…Overall, these results suggest that ligand excess, of either linker or modulator, exerts the greatest impact on nanoMOF sizes in general. 43 and that strongly acidic modulators improve the colloidal stability of UiO-66. 38 More generally, the seesaw model serves as a complement to well-established models of bulk crystal growth and polymer formation.…”