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Effect of Flexibility and Nanotriboelectrification on the Dynamic Reversibility of Water Intrusion into Nanopores: Pressure-Transmitting Fluid with Frequency-Dependent Dissipation Capability.

Alexander Rowland LoweNikolay TsyrinMirosław A Chora ŻewskiPaweł ZajdelMichał MierzwaJuscelino B LeãoMarkus BleuelTong FengDong LuoMian LiDan LiVictor StoudenetsSebastian PawlusAbdessamad FaikYaroslav Grosu
Published in: ACS applied materials & interfaces (2019)
In this article, the effect of a porous material's flexibility on the dynamic reversibility of a nonwetting liquid intrusion was explored experimentally. For this purpose, high-pressure water intrusion together with high-pressure in situ small-angle neutron scattering were applied for superhydrophobic grafted silica and two metal-organic frameworks (MOFs) with different flexibility [ZIF-8 and Cu2(tebpz) (tebpz = 3,3',5,5'tetraethyl-4,4'-bipyrazolate)]. These results established the relation between the pressurization rate, water intrusion-extrusion hysteresis, and porous materials' flexibility. It was demonstrated that the dynamic hysteresis of water intrusion into superhydrophobic nanopores can be controlled by the flexibility of a porous material. This opens a new area of applications for flexible MOFs, namely, a smart pressure-transmitting fluid, capable of dissipating undesired vibrations depending on their frequency. Finally, nanotriboelectric experiments were conducted and the results showed that a porous material's topology is important for electricity generation while not affecting the dynamic hysteresis at any speed.
Keyphrases
  • metal organic framework
  • single molecule
  • ionic liquid
  • highly efficient
  • tissue engineering