Motorized Janus metal organic framework crystals

Abstract

We describe Janus metal organic framework crystals that are propelled by bubble ejection. The Janus crystals are prepared by selective epitaxial growth of ZIF-67 on ZIF-8. The Janus crystals catalyse the decomposition of H2O2 into H2O and O2 on the ZIF-67 surface but not on the zinc containing ZIF-8 surface, resulting in propulsion of the Janus crystals.

Synthetic Strategies and Structural Arrangements of Isoreticular Mixed‐Component Metal–Organic Frameworks

“…Furthermore, XPS or EDX line scans or mapping of core–shell particles can reveal different metal concentrations in the inner and outer sphere of the particles. The use of XRF mapping has also been shown to be successful for the characterization of regions with different metal species within Janus‐MOF particles …”

“…Interestingly, a complete metal exchange was visible after one day. Janus‐MOF particles can be seen as core–shell architectures with an only partially developed shell. However, only one example of heterometallic Janus‐MOF particles has been reported so far .…”

“…Janus‐MOF particles can be seen as core–shell architectures with an only partially developed shell. However, only one example of heterometallic Janus‐MOF particles has been reported so far . Furthermore, heterometallic heteroepitaxial SURMOFs have been reported, which can be seen as a borderline case of a two‐dimensional core–shell structure, and might therefore, be assigned to C , but these are not treated here in detail.…”

Stretchable and Reactive Membranes of Metal–Organic Framework Nanosurfactants on Liquid Droplets Enable Dynamic Control of Self‐Propulsion, Cargo Pick‐Up, and Drop‐Off

“…These particles were chosen for two reasons: 1) Although their surface presented neutral imidazoles and was hydrophilic, the imidazoles in the interior were all deprotonated rendering the particle's bulk partially hydrophobic and partially hydrophilic (for details, see ref. [40,41] This property is important for the MOF monolayers propelling the droplets. [40,41] This property is important for the MOF monolayers propelling the droplets.…”

“…Figure 5a illustrates that when a water droplet covered with ZIF-67 particles contains a solution of 15 wt% H 2 O 2 , this "fuel" is decomposed [40,41] on the catalytic Co 2þ sites, producing O 2 bubbles detaching from the particle membrane and providing recoil to propel the droplets. Figure 5a illustrates that when a water droplet covered with ZIF-67 particles contains a solution of 15 wt% H 2 O 2 , this "fuel" is decomposed [40,41] on the catalytic Co 2þ sites, producing O 2 bubbles detaching from the particle membrane and providing recoil to propel the droplets.…”