While the development of mixed matrix membranes (MMMs) has revolutionized gas separation applications, O₂ and N₂ gases are hardly separated from each other due to the small difference between their kinetic diameters. Here, magnetic MMMs consisting of polyethersulfone (PES)/Pebax-1657-BaFe₁₂O₁₉ nanoparticles (NPs) are fabricated by using a co-casting method. The PES and Pebax polymers are used as the substrate and top layer, respectively. The Pebax selective layer (∼ 4 µm in thickness) is filled with BaFe₁₂O₁₉ powder in the presence of an external magnetic field (H= 0.5 T), providing efficient dispersion and accumulation of the magnetic NPs in the polymer matrix with high chemical stability. Field-emission scanning electron microscopic images indicate the absence of gaps, collapse, and crush at the contact layers of the two polymers, resulting in a dense top layer. By fabricating magnetic double-layer MMMs with 18 and 24 wt.% BaFe₁₂O₁₉ NPs, the respective ideal selectivity of O₂/N₂ gases in the presence of H= 0.5 T at 25°C is found to be 4 and 4.01, indicating significant enhancement in the gas separation compared to the non-magnetic MMM with an ideal selectivity of 1.87 in the absence of H.

尽管混合基质膜（MMMs）的发展彻底改变了气体分离的应用，但是O ₂和N ₂气体由于动力学直径之间的微小差异而几乎彼此分离。在此，通过共铸法制造了由聚醚砜（PES）/ Pebax-1657-BaFe ₁₂ O ₁₉纳米粒子（NP）组成的磁性MMM 。PES和Pebax聚合物分别用作基材和顶层。Pebax选择层（厚度约4 µm）充满BaFe ₁₂ O ₁₉粉末在外部磁场（H = 0.5 T）的存在下，可提供磁性NP在聚合物基质中的高效分散和积累，并具有很高的化学稳定性。场发射扫描电子显微镜图像表明在两种聚合物的接触层处没有间隙，塌陷和压溃，从而导致致密的顶层。通过制造具有18和24 wt％的BaFe ₁₂ O ₁₉ NP的磁性双层MMM，发现在25°C下H = 0.5 T的条件下，O ₂ / N ₂气体的各自理想选择性为4和4.01 ，表明与非磁性MMM相比，在不存在H的情况下，理想的选择性为1.87，气体分离效果显着提高。