We constructed highly oriented and ordered macropores within metal-organic framework (MOF) single crystals, opening up the area of three-dimensional–ordered macro-microporous materials (that is, materials containing both macro- and micropores) in single-crystalline form. Our methodology relies on the strong shaping effects of a polystyrene nanosphere monolith template and a double-solvent–induced heterogeneous nucleation approach. This process synergistically enabled the in situ growth of MOFs within ordered voids, rendering a single crystal with oriented and ordered macro-microporous structure. The improved mass diffusion properties of such hierarchical frameworks, together with their robust single-crystalline nature, endow them with superior catalytic activity and recyclability for bulky-molecule reactions, as compared with conventional, polycrystalline hollow, and disordered macroporous ZIF-8.
A lysosome-targeting dual-functional fluorescent probe was rationally designed and developed for imaging intracellular lysosomal viscosity and beta-amyloid.
A series of 1,3-bispropyltriethoxysilane-imidazolium
chloride (FILs)-modified
SBA-15 adsorbents have been prepared, characterized, and applied in
SO2 capture for the first time. At low FILs loadings, significant
levels of grafting were observed, while higher loading levels resulted
in retention of a greater fraction of FILs precursors, as evidenced
by FTIR spectroscopy. Textural properties gradually declined as FILs
content increased, in conjunction with an apparent change in the regular
nature of the SBA-15 pore structure and bulk particle morphology,
as demonstrated by XRD, TEM, and SEM. SO2 adsorption breakthrough
curves indicated that all materials possessed rapid and facile adsorption
properties, with t
0.9 values 1–2
orders of magnitude lower than those obtained over comparable materials
under more favorable conditions. The largest total SO2 adsorption
was achieved over 10%FILs@SBA-15, which exhibited a maximized FILs
adsorption contribution that remained constant at higher loadings.
Corrections against surface area demonstrated that a continual increase
in adsorption were apparent, verifying the importance of the change
in nature of the FILs at higher loadings. The optimized adsorbent
demonstrated few strong SO2 binding sites, as indicated
by excellent stability during adsorption–desorption cycles.
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