Growth of ZIF‐8 MOF Films with Tunable Porosity by using Poly (1‐vinylimidazole) Brushes as 3D Primers

Abstract

This work reports on an ovel and versatile approach to control the structure of metal-organic framework (MOFs)f ilms by using polymeric brushes as 3D primers, suitable for triggering heterogeneous MOF nucleation.A sa proof-of-concept, this work explores the use of poly(1-vinylimidazole) brushesprimerobtained via surface-initiateda tom transferr adical polymerization (SI-ATRP) for the synthesis of Zn-based ZIF-8 MOF films. By modifying the grafting density of the brushes,s mooth porousf ilms were obtained featuring inherently hydrophobic microporosity arising from ZIF-8 structure, and an additional constructional interparticle mesoporosity,w hich can be employed for differential adsorption of targeted adsorbates. It was found that the graftingd ensity modulatest he constructional porosity of the films obtained; higherg rafting densities result in more compact structures,w hile lower grafting density generates increasingly inhomogeneous films with ah igherp roportion of interparticleconstructional porosity.

Nanoarchitectonics of metal organic frameworks and PEDOT layer-by-layer electrodes for boosting oxygen reduction reaction

“…Furthermore, a SEM image of a 3x-ZIF-8-(PEI/PEDOT) 4 substrate is shown in Figure 2A, where a top view of a film showing the nanocrystals of the deposited MOF can be seen, as previously reported. 75,76 When compared with the SEM picture of a (PEI/PEDOT) 4 substrate (Figure S1), the differences ascribed to the deposited MOF layer are clearly evidenced.…”

Reactivity Ratios and Surface Properties of Confined and Bulk ATRP Copolymerization of Butyl Methacrylate and 2-Hydroxyethyl Acrylate

“…As previously reported and in the same way aborted in this work, the chemical modification of substrates with APTES and α-bromo isobutyryl bromide produces surfaces with initiator points to be polymerized via ARPT methods. ,,, HEA and BMA bulk homopolymerization produces homopolymers (BMA 0 –HEA 1 and BMA 1 –HEA 0 ) whose structure, H NMR spectra, and assignment of resonance signals are shown in Figure . Figure A,B displays the H NMR spectra for all bulk and confined copolymers obtained in the entire composition range.…”

Shelter for Biologically Relevant Molecules: Photoprotection and Enhanced Thermal Stability of Folic Acid Loaded in a ZIF-8 MOF Porous Host

“…Special care was taken in ensuring the preservation of PteGlu exposure to light sources . PteGlu and zinc nitrate methanolic solutions were mixed to promote the interaction between Zn 2+ and carboxylic moieties on the glutamate residue; such a premixing step was demonstrated to trigger confined nucleation due to supersaturation upon the addition of 2-methylimidazolate linker (see Fourier transform infrared (FTIR) spectroscopy experiments below). , Briefly, 12.5 mL of 50 mM methanolic zinc nitrate solution was mixed with 12.5 mL of methanol with 12.0 mg of PteGlu dissolved in 12.5 mL of methanol in the absence of light for a 7:1 molar ratio (zinc/PteGlu). The as-prepared mixture was sonicated in a cold bath for 20 min and then mixed at room temperature with 12.5 mL of 50 mM 2-methylimidazole methanolic solution (equimolar metal/linker molar ratio, total volume 37.5 mL).…”