Tunable magneto-responsive mesoporous block copolymer membranes
Tunable magneto-responsive mesoporous block copolymer membranes
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DOI：
10.1016/j.memsci.2017.08.069
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发表时间：
2017-12
影响因子：
9.5
通讯作者：
Yanchun Tang;Xi Lin;K. Ito;Ling Hong;Takashi Ishizone;Hideaki Yokoyama;M. Ulbricht
中科院分区：
文献类型：
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作者：
Yanchun Tang;Xi Lin;K. Ito;Ling Hong;Takashi Ishizone;Hideaki Yokoyama;M. Ulbricht
成功地制备了介孔磁敏响应膜，该介孔膜具有可遥控的分级可调的筛分势垒孔径变化。在聚偏氟乙烯(methacrylate)-block-polystyrene-block-poly(oligo(ethylene)大孔支撑膜的顶部，将氧化铁纳米粒子(IONP)嵌入聚乙二醇甲醚甲基丙烯酸酯(PMEONMA-b-PS-b-PMEONMA)中，形成薄的介孔尺寸选择膜。将IONPs和PMEOnMA-b-PS-b-PMEOnMA混合溶液纺制在PVDF膜上，然后用甲醇和超临界CO2的混合物控制选择溶胀，将介孔引入亲水性PMEOnMA结构域。负载的IONPs聚集成小团簇(0.1-1µm)，并在PMEOnMA-b-PS-b-PMEOnMA介孔顶层中均匀分散。根据水和葡聚糖的超滤性能，发现含有IONPs的膜没有缺陷，扫描电子显微镜(SEM)图像显示，它们的屏障孔径与不含IONPs的膜几乎相同。在不同输入能量的交变磁场作用下，膜的透水率和葡聚糖截留率都达到了不同的水平，说明这种混合基质纳米复合膜的筛分屏障孔径分布是逐级可调的。
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) (PMEOnMA-b-PS-b-PMEOnMA), on top of a polyvinylidene fluoride (PVDF) macroporous support membrane. IONPs and PMEOnMA-b-PS-b-PMEOnMA mixture solutions were spun-cast on PVDF membranes, and then mesopores were introduced into the hydrophilic PMEOnMA domains by controlled selective swelling with a mixture of methanol and supercritical CO2. The loaded IONPs aggregated into small clusters (0.1–1 µm) and were finely dispersed in the PMEOnMA-b-PS-b-PMEOnMA 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.