If nanoparicles in-situ generated in polymer mixture , will it be MMM or nanocomposite or hybrid membrane ???
And , if they just dispersed in the polymer matrix after synthesis , what will it be ??
Mixed matrix membranes generally contain porous materials playing a sieving role with sorption capacity. Gas transport mechanism through MMMs is solution-diffusion and the dispersed phase (porous nanoparticles) shows the same mechanism, solution-diffusion. Therefore, addition of porous nano particles ideally improves sorption or diffusion coefficient, or both. Hybrid membranes composed of porous inorganic materials with molecular sieving effect (such as MOFs and Zeolites) are called mixed matrix membranes. On the other hand, nanocomposite generally refers to mixed matrix containing nano particles which are not permeable or have no sieving effect. Polymers containing TiO2 is an example for nanocomposite membranes. The presence of nanoparticles in polymer matrix makes the diffusion path longer for undesired gas to pass through membrane. They provide better affinity with the specific component and can also improve the solubility of a gas molecule, for example.
Composite membranes are made of a porous layer as a support coated with a selective thin layer. Sometimes composite membrane is used for MMMs and nanocmoposites.
https://ac.els-cdn.com/B9780081004081000078/3-s2.0-B9780081004081000078-main.pdf?_tid=5a15b2a4-149f-11e8-82e5-00000aacb360&acdnat=1518953716_b365ea0baf50cd642e5fb1118e863610
The definition is vague between them. MMM and nanocomposite is interchangable, though MMM usually refers to completely nano-dispersed membrane, while nanocomposite usually refers to nano-dispersed surface layer/support layer only (but some researchers do not follow this definition; they use the term nanocomposite for MMM but never found it the other way around). On the other hand, there’s a thin film nanocomposite membrane (thin surface film with dispersed nano on porous support), but I never saw it being called thin film mixed matrix membrane. So I guess this should be the best guide so far; MMM for overall dispersed nano membrane while nanocomposite for composite membrane with nano dispersed in one of the layer,
Not familiar with the term hybrid membrane, but if the nano additive is inorganic then the term should be suited for both MMM and nanocomposite
Mixed matrix membranes generally contain porous materials playing a sieving role with sorption capacity. Gas transport mechanism through MMMs is solution-diffusion and the dispersed phase (porous nanoparticles) shows the same mechanism, solution-diffusion. Therefore, addition of porous nano particles ideally improves sorption or diffusion coefficient, or both. Hybrid membranes composed of porous inorganic materials with molecular sieving effect (such as MOFs and Zeolites) are called mixed matrix membranes. On the other hand, nanocomposite generally refers to mixed matrix containing nano particles which are not permeable or have no sieving effect. Polymers containing TiO2 is an example for nanocomposite membranes. The presence of nanoparticles in polymer matrix makes the diffusion path longer for undesired gas to pass through membrane. They provide better affinity with the specific component and can also improve the solubility of a gas molecule, for example.
Composite membranes are made of a porous layer as a support coated with a selective thin layer. Sometimes composite membrane is used for MMMs and nanocmoposites.
https://ac.els-cdn.com/B9780081004081000078/3-s2.0-B9780081004081000078-main.pdf?_tid=5a15b2a4-149f-11e8-82e5-00000aacb360&acdnat=1518953716_b365ea0baf50cd642e5fb1118e863610
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