A simple and scalable method for preparing low-defect ZIF-8 tubular membranes

Sub-micron Polymer–Zeolitic Imidazolate Framework Layered Hybrids via Controlled Chemical Transformation of Naked ZnO Nanocrystal Films

“…45 As ZnO has been reported previously as an effective templating agent for the solvothermal growth of ZIF films, we reasoned that metal oxide may be necessary for a local ZIF nucleation event, consistent with a heterogeneous nucleation mechanism. 11,36,46 Phase-pure ZIF at the polymer surface was not measured in any of the XANES experiments when the initial ZnO film thickness was 30 nm. If ZnO is needed for heterogeneous nucleation, the voids between crystals due to rapid nanocrystal dissolution are concomitant with fewer nucleation sites in those regions on PIM-1.…”

ZIF-8 membranes with improved reproducibility fabricated from sputter-coated ZnO/alumina supports

“…Partial self-conversion of inorganic support to metal-organic frameworks (MOFs) membrane can effectively promote the heterogeneous nucleation and enhance the binding strength between MOF grain and support, improving the reproducibility of as-synthesized membranes (Dong et al, 2012;Guo et al, 2009;Hu et al, 2011;Khaletskaya et al, 2014;Liu et al, 2014b;Marti et al, 2013;Zhang et al, 2013;Zhang et al, 2014). For example, Jin et al (Hu et al, 2011) prepared continuous MIL-53(Al) membranes on α-alumina supports, in which the α-alumina support acted as the inorganic source reacting with the organic ligand to grow a seeding layer.…”

“…As a result, an ultrathin ZnO layer deposited on porous α-alumina supports was an idea candidate for preparing thin zinc-based MOF membranes using partial self-conversion strategy. For instance, Zhang et al have successfully prepared ZIF-8 membranes through partial self-conversion of thin ZnO layer under hydrothermal synthesis (Zhang et al, 2013).…”

Continuous flow ZIF-8/NaA composite membrane microreactor for efficient Knoevenagel condensation

“…On one hand, the ZnO layer acted as a precursor seed layer for continuous ZIF-8 membrane growth on different substrates by reacted with the Hmim solution. On the other hand, the introduction of ZnO layer prevented the delamination between ZIF-8 membrane and the substrate, resulting in excellent structure stability [9]. After the NaA zeolite modification layer was synthesized, a layer of ZnO particles was introduced as the seed induction layer to facilitate the following ZIF-8 membrane growth on the NaA zeolite membrane.…”

“…So far, conceptually different strategies for the fabrication of ZIF-8 membrane have been explored and they are mainly classified into two basic categories: in situ crystallization and seed induced growth crystallization [8]. Very recently, motivated by its easy handling and excellent induction effect, a so-called ZnO-induced growth method has been extensively studied and regarded as an efficient development for the synthesis of continuous ZIF-8 membrane [9]. On the other hand, when it comes to the applications of the ZIF-8 membrane, it is well recognized that they are generally applied in gas separation and chemical sensors [8], whereas few reports have been focused on their catalysis applications.…”