Nanoscale Thickness Control of Nanoporous Films Derived from Directionally Photopolymerized Mesophases
Nanoscale Thickness Control of Nanoporous Films Derived from Directionally Photopolymerized Mesophases
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DOI：
10.1002/admi.202001977
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发表时间：
2020-12-23
影响因子：
5.4
通讯作者：
Osuji, Chinedum O.
中科院分区：
文献类型：
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作者：
Imran, Omar Q.;Kim, Na Kyung;Osuji, Chinedum O.
纳米结构功能材料薄膜的制备是从光子学到分离科学的各种应用中的关键步骤。新的薄膜制造方法寻求利用新兴的潜力，自组装纳米结构材料作为下一代膜。在这里，作者表明，纳米尺度的控制自组装的中间相的厚度可以制定定向光聚合的存在下，高度光衰减的分子物种。计量学揭示了平均薄膜生长速率低于每秒10纳米，表明高分辨率制造是可能的，这种方法。实验数据的趋势再现以及在数值模拟中建模的平均场正面光聚合在一个高度光衰减和光漂白介质。这些模拟结果将实验观察到的薄膜生长的纳米尺度控制与中间相的强光衰减性质联系起来，这源于其高芳环含量。对所制造的薄膜进行的水渗透率测量显示了渗透率与膜厚度的预期线性比例。膜渗透性与当前最先进的纳滤和反渗透膜相比是有利的，这表明当前的方法可用于制备用于此类应用的新的纳米多孔膜。
The preparation of thin films of nanostructured functional materials is a critical step in a diverse array of applications ranging from photonics to separation science. New thin-film fabrication methods are sought to harness the emerging potential of self-assembled nanostructured materials as next-generation membranes. Here, the authors show that nanometer-scale control over the thickness of self-assembled mesophases can be enacted by directional photopolymerization in the presence of highly photo-attenuating molecular species. Metrology reveals average film growth rates below ten nanometers per second, indicating that high-resolution fabrication is possible with this approach. The trends in experimental data are reproduced well in numerical simulations of mean-field frontal photopolymerization modeled in a highly photo-attenuating and photo-bleaching medium. These simulation results connect the experimentally observed nanometer-scale control of film growth to the strong photo-attenuating nature of the mesophase, which originates from its high-aromatic-ring content. Water permeability measurements conducted on the fabricated thin films show the expected linear scaling of permeability with film thickness. Film permeabilities compare favorably with current state-of-the-art nanofiltration and reverse osmosis membranes, suggesting that the current approach may be utilized to prepare new nanoporous membranes for such applications.