Membranes with highly ordered straight nanopores by selective swelling of fast perpendicularly aligned block copolymers

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题名:	Membranes with highly ordered straight nanopores by selective swelling of fast perpendicularly aligned block copolymers
作者:	孫亞賢;Yin, Jun;Yao, Xueping;Liou, Jiun-You;Sun, Wei;Sun, Ya-Sen;Wang, Yong
贡献者:	工學院化學工程與材料工程學系
关键词:	Alignment;Annealing;Block copolymers;Deposition;Membranes;Metal oxides;Porosity;Solvents;Swelling
日期:	2013-11-26
上传时间:	2026-04-21 14:16:38 (UTC+8)
出版者:	American Chemical Society;United States: American Chemical Society
摘要:	摘要： Membranes with uniform, straight nanopores have important applications in diverse fields, but their application is limited by the lack of efficient producing methods with high controllability. In this work, we reported on an extremely simple and efficient strategy to produce such well-defined membranes. We demonstrated that neutral solvents were capable of annealing amphiphilic block copolymer (BCP) films of polystyrene-block-poly(2-vinylpyridine) (PS-b-P2VP) with thicknesses up to 600 nm to the perpendicular orientation within 1 min. Annealing in neutral solvents was also effective to the perpendicular alignment of block copolymers with very high molecular weights, e.g., 362 000 Da. Remarkably, simply by immersing the annealed BCP films in hot ethanol followed by drying in air, the originally dense BCP films were nondestructively converted into porous membranes containing highly ordered, straight nanopores traversing the entire thickness of the membrane (up to 1.1 μm). Grazing incident small-angle X-ray spectroscopy confirmed the hexagonal ordering of the nanopores over large areas. We found that the overflow of P2VP chains from their reservoir P2VP cylinders and the deformation of the PS matrix in the swelling process contributed to the transformation of the solid P2VP cylinders to empty straight pores. The pore diameters can be tuned by either changing the swelling temperatures or depositing thin layers of metal oxides on the preformed membranes via atomic layer deposition with a subnanometer accuracy. To demonstrate the application of the obtained porous membranes, we used them as templates and produced centimeter-scale arrays of aligned nanotubes of metal oxides with finely tunable wall thicknesses. 其他題名： ACS Nano 出版者： United States: American Chemical Society 出版日期： 2013-11-26 出處： ACS nano, 2013-11, Vol.7 (11), p.9961-9974 資源來源： American Chemical Society Journals 版權： Copyright © 2013 American Chemical Society 識別號： ISSN: 1936-0851 識別號： ISSN: 1936-086X 識別號： EISSN: 1936-086X 識別號： DOI: 10.1021/nn403847z 識別號： PMID: 24131365
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