A novel heterogeneous copper catalyst based on a 3D-network polymer containing pendant amine groups was synthesized via post-functionalization of the polymeric backbone followed by incorporation of copper(i) ions.
Recyclable phase transfer catalysts containing magnetic nanoparticles (MNPs) have been known as a major trend towards sustainable catalysts. In this study, a novel class of magnetic porous polymer on the basis of calix[4]resorcinarene was synthesized starting from silica-coated Fe 3 O 4 core-shell nanoparticles. This compound was found as an efficient phase transfer catalyst to the conversion of benzyl halides into benzyl azides and cyanides in good yields. The catalyst could be used at least for five consecutive cycles without appreciable loss in the catalytic activity.
The standard lattice Boltzmann equation, LBE, is inadequate for simulating gas flows in nano scale flows with Knudsen numbers higher than 0.1. In the present study, rarefied gas flow in nano porous structures is simulated using the modified Lattice Boltzmann Method, LBM, which is able to cover wide range of flow regimes. The present study, reports the effects of the Knudsen number and porosity on the flow rate and permeability in slip and transitional flow regimes. For the first time, the Knudsen's minimum effect in micro/nano porous was observed. A new correlation between the permeability, the porosity and the Knudsen number is then proposed which is able to predict the permeability of in-line and staggered nano porous structures in slip and transitional regimes.
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