Framework flexibility of ZIF-8 under liquid intrusion: discovering time-dependent mechanical response and structural relaxation

Abstract

The structural flexibility of ZIF-8 has been elucidated by liquid intrusion under moderate pressures of tens of MPa.

Highly Luminescent Silver-Based MOFs: Scalable Eco-Friendly Synthesis Paving the Way for Photonics Sensors and Electroluminescent Devices

“…Extraordinarily, when the compression tests and subsequent grinding step were repeated for a second time on the same recovered material, comparable results were obtained (Figure S11). Our results highlight the sensitivity of OX-2 MOF towards an exogenous mechanical stress and the repeatability of this procedure stems from the elastic recovery (springback) of its framework structure from stress relaxation [40], thus offering an exciting avenue for the integration of OX-2 into deformation-based sensors useful for the sensing of mechanical strain stimuli. The thermochromic ability of OX-2 in detecting changes in temperature has also been studied.…”

Highly Luminescent Silver-Based MOFs: Scalable Eco-Friendly Synthesis Paving the Way for Photonics Sensors and Electroluminescent Devices

“…Extraordinarily, when the compression tests and subsequent grinding step were repeated for a second time on the same recovered material, comparable results were obtained (Figure S11). Our results highlight the sensitivity of OX-2 MOF towards an exogenous mechanical stress and the repeatability of this procedure stems from the elastic recovery (springback) of its framework structure from stress relaxation [50], thus offering an exciting avenue for the integration of OX-2 into deformation-based sensors useful for the sensing of mechanical strain stimuli. What is most remarkable is that the emission of OX-2 does not exhibit significant losses with each cycle (repeated 10 times, see Figure 5D), meaning that the response of this OX-2 MOF is very reproducible under thermal cycling conditions.…”

Mechanical Control of the Kinetic Propylene/Propane Separation by Zeolitic Imidazolate Framework‐8

“…[11,[15][16][17][18][19] Boosting the level of performance of ZIF-8 for such challenging separations is atopical area of research, since any improvement in terms of selectivity is expected to lead to asignificant advantage from an economic standpoint. Here we propose an innovative concept based on the use of an external mechanical pressure to control the fluctuations in the aperture size of ZIF-8 upon adsorption, and these fluctuations are expected to dominate the kinetic-based separation of propylene over propane.T he control of only one parameter at at ime,e ither the adsorption [20,21] or the application of am echanical constraint [22,23] acting as an internal and external pressure on the MOFs,has been explored so far.T od ate,n os tudy has explored the synergistic combination of pore architecture and adsorption to optimize highly challenging separation-based processes. This concept proposes acomplementary route to the current strategy that usually calls for the costly and time-consuming development of refined adsorbent materials.…”