Zeolitic imidazolate framework (ZIF-8) based polymer nanocomposite membranes for gas separation

By Qilei Song, S. Nataraj, M. Roussenova, Jin‐Chong Tan, D. Hughes, Wei Li, P. Bourgoin, M. A. Alam, A. Cheetham, S. Al‐Muhtaseb and 1 more. 2012

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As synthesised ZIF-8 nanoparticles (size ∼ 60 nm and specific surface area ∼ 1300–1600 m2 g−1) were directly incorporated into a model polymer matrix (Matrimid® 5218) by solution mixing. This produces flexible transparent membranes with excellent dispersion of nanoparticles (up to loadings of 30 wt%) with good adhesion within the polymer matrix, as confirmed by scanning electron microscopy, dynamic mechanical thermal analysis and gas sorption studies. Pure gas (H2, CO2, O2, N2 and CH4) permeation tests showed enhanced permeability of the mixed matrix membrane with negligible losses in selectivity. Positron annihilation lifetime spectroscopy (PALS) indicated that an increase in the free volume of the polymer with ZIF-8 loading together with the free diffusion of gas through the cages of ZIF-8 contributed to an increase in gas permeability of the composite membrane. The gas transport properties of the composite membranes were well predicted by a Maxwell model whilst the processing strategy reported can be extended to fabricate other polymer nanocomposite membranes intended for a wide range of emerging energy applications.

Subfields: Inorganic Chemistry, Mechanical Engineering, Mechanics of Materials

View Paper: https://www.semanticscholar.org/paper/c1ea6dacfd0295c774a2dd2f4d8aaee418d03ce1

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In Inorganic Chemistry

In Mechanical Engineering

In Mechanics of Materials

Citations in the corpus

Mixed-matrix membranes of zeolitic imidazolate framework (ZIF-8)/Matrimid nanocomposite: Thermo-mechanical stability and viscoelasticity underpinning membrane separation performance (2016, methodology): “approach [48], followed by casting via doctor-blade technique.”
Natural gas purification and olefin/paraffin separation using thermal cross-linkable co-polyimide/ZIF-8 mixed matrix membranes (2013, methodology): “ZIF-8 (Zn (2methylimidazole)2) is one of the most extensively studied ZIFs [2,28,34–41].”
MOF-mixed matrix membranes: Precise dispersion of MOF particles with better compatibility via a particle fusion approach for enhanced gas separation properties (2015, methodology): “and matrix [12,19,21,51].”