Abstract Mesoporous magneto-responsive membranes with remote-controllable step-wise tunable changes of sieving barrier pore size were successfully prepared. The membranes were composed of a thin mesoporous size-selective layer containing iron oxide nanoparticles (IONPs) embedded in poly(oligo(ethylene glycol) methyl ether methacrylate)- block -polystyrene- block -poly(oligo(ethylene glycol) methyl ether methacrylate) (PMEO n MA- b -PS- b -PMEO n MA), on top of a polyvinylidene fluoride (PVDF) macroporous support membrane. IONPs and PMEO n MA- b -PS- b -PMEO n MA mixture solutions were spun-cast on PVDF membranes, and then mesopores were introduced into the hydrophilic PMEO n MA domains by controlled selective swelling with a mixture of methanol and supercritical CO 2 . The loaded IONPs aggregated into small clusters (0.1–1 µm) and were finely dispersed in the PMEO n MA- b -PS- b -PMEO n MA mesoporous top layer. No defect was found in the membranes with IONPs based on water and dextran ultrafiltration performances, and scanning electron microscopy (SEM) images showed that their barrier pore sizes were almost identical to those of no IONPs containing membranes. Upon stimulation with alternating magnetic field with different input energy, the water permeability as well as the dextran rejection were tuned into different levels, indicating that the sieving barrier pore size distribution of these thin-film mixed matrix nanocomposite membranes was step-wise adjustable.

中文翻译：

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可调磁响应介孔嵌段共聚物膜

摘要 成功制备了具有可遥控步进式调节筛分孔径变化的介孔磁响应膜。该膜由含有氧化铁纳米颗粒 (IONP) 的薄介孔尺寸选择层组成，该纳米颗粒嵌入聚（低聚（乙二醇）甲基醚甲基丙烯酸酯）-嵌段-聚苯乙烯-嵌段-聚（低聚（乙二醇）甲基醚甲基丙烯酸酯） (PMEO n MA- b -PS- b -PMEO n MA)，在聚偏二氟乙烯 (PVDF) 大孔支撑膜之上。IONPs 和 PMEO n MA- b -PS- b -PMEO n MA 混合物溶液在 PVDF 膜上旋涂，然后通过甲醇和超临界 CO 2 的混合物受控选择性溶胀将介孔引入亲水性 PMEO n MA 域中. 加载的 IONP 聚合成小簇 (0. 1–1 µm) 并精细分散在 PMEO n MA- b -PS- b -PMEO n MA 介孔顶层中。基于水和葡聚糖超滤性能，在含有 IONPs 的膜中没有发现缺陷，扫描电子显微镜 (SEM) 图像显示它们的屏障孔径几乎与不含 IONPs 的膜相同。在不同输入能量的交变磁场刺激下，水渗透性和葡聚糖排斥被调整到不同的水平，表明这些薄膜混合基质纳米复合膜的筛分屏障孔径分布是逐步可调的。扫描电子显微镜 (SEM) 图像显示，它们的屏障孔径与不含 IONP 的膜的孔径几乎相同。在不同输入能量的交变磁场刺激下，水渗透性和葡聚糖排斥被调整到不同的水平，表明这些薄膜混合基质纳米复合膜的筛分屏障孔径分布是逐步可调的。扫描电子显微镜 (SEM) 图像显示，它们的屏障孔径与不含 IONP 的膜的孔径几乎相同。在不同输入能量的交变磁场刺激下，水渗透性和葡聚糖排斥被调整到不同的水平，表明这些薄膜混合基质纳米复合膜的筛分屏障孔径分布是逐步可调的。