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Carboxyl-functionalized nanochannels based on block copolymer hierarchical structures
Faraday Discussions ( IF 3.4 ) Pub Date : 2018-07-05 , DOI: 10.1039/c8fd00015h
Valentina-Elena Musteata 1, 2, 3 , Stefan Chisca 1, 2, 3 , Florian Meneau 4, 5, 6, 7 , Detlef-M. Smilgies 8, 9, 10, 11 , Suzana P. Nunes 1, 2, 3
Affiliation  

When building artificial nanochannels, having a scalable robust platform with controlled morphology is important, as well as having the option for final functionalization of the channels for the selective transport of water and proteins. We have previously developed asymmetric membranes that have a surface layer of very sharp pore size distribution, surface charge and pore functionalization. Here, a more complex bioinspired platform is reported. Hierarchical isotropic porous structures with spherical micrometer-sized cavities, interconnected by hexagonally ordered nanochannels, were prepared based on the phase separation of polystyrene-b-poly(t-butyl acrylate) block copolymers, following a nucleation and growth mechanism. The structure was imaged by scanning electron microscopy, which demonstrated a high density of ordered nanochannels. The hexagonal order formed by the self-assembly in solution was confirmed by small-angle X-ray scattering. The structure evolution was investigated by time-resolved grazing-incidence small-angle X-ray scattering. The assembled hydrophobic hierarchical structure was then converted to a hydrophilic structure by acid hydrolysis, leading to nanochannels covered by carboxylic groups and therefore convenient for water transport.

中文翻译:

基于嵌段共聚物层次结构的羧基官能化纳米通道

在构建人工纳米通道时,具有可控的形态,可扩展的强大平台非常重要,并且可以选择对通道进行最终功能化以选择性运输水和蛋白质。我们以前已经开发出了不对称膜,该膜具有非常尖锐的孔径分布,表面电荷和孔功能化的表面层。在这里,报道了一个更复杂的生物启发平台。基于聚苯乙烯-b-聚(t继成核和生长机理后的丙烯酸丁酯)嵌段共聚物。该结构通过扫描电子显微镜成像,显示出高密度的有序纳米通道。通过小角度X射线散射确认了溶液中自组装形成的六边形顺序。通过时间分辨掠入射小角X射线散射研究了结构演化。然后通过酸水解将组装的疏水分层结构转化为亲水结构,从而导致被羧基覆盖的纳米通道,因此便于水运输。
更新日期:2018-09-28
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