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DOI	10.1073/pnas.2019891118
	Two-dimensional fractal nanocrystals templating for substantial performance enhancement of polyamide nanofiltration membrane
	Lu Y.; Wang R.; Zhu Y.; Wang Z.; Fang W.; Lin S.; Jin J.
发表日期	2021
ISSN	0027-8424
卷号	118 期号:37
英文摘要	In this study, we report the emergence of two-dimensional (2D) branching fractal structures (BFS) in the nanoconfinement between the active and the support layer of a thin-film-composite polyamide (TFC-PA) nanofiltration membrane. These BFS are crystal dendrites of NaCl formed when salts are either added to the piperazine solution during the interfacial polymerization process or introduced to the nascently formed TFC-PA membrane before drying. The NaCl dosing concentration and the curing temperature have an impact on the size of the BFS but not on the fractal dimension (∼1.76). The BFS can be removed from the TFC-PA membranes by simply dissolving the crystal dendrites in deionized water, and the resulting TFC-PA membranes have substantially higher water fluxes (three- to fourfold) without compromised solute rejection. The flux enhancement is believed to be attributable to the distributed reduction in physical binding between the PA active layer and the support layer, caused by the exertion of crystallization pressure when the BFS formed. This reduced physical binding leads to an increase in the effective area for water transport, which, in turn, results in higher water flux. The BFS-templating method, which includes the interesting characteristics of 2D crystal dendrites, represents a facile, low-cost, and highly practical method of enhancing the performance of the TFC-PA nanofiltration membrane without having to alter the existing infrastructure of membrane fabrication. © 2021 National Academy of Sciences. All rights reserved.
英文关键词	Fractal structure; High flux; Interfacial polymerization; Nanofiltration membrane
语种	英语
scopus关键词	deionized water; nanocrystal; piperazine; polyamide; sodium chloride; Article; artificial membrane; branching fractal structure; chemical binding; concentration (parameter); controlled study; crystal structure; crystallization; dissolution; membrane structure; nanofiltration; physical chemistry; polymerization; pressure; temperature sensitivity; water transport
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/238400
作者单位	International Laboratory for Adaptive Bio-Nanotechnology, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou, 215123, China; Department of Civil and Environmental Engineering, Vanderbilt University, Nashville, TN 37235-1831, United States; Center for Excellence in Nanoscience, Chinese Academy of Sciences, Beijing, 100190, China; College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, China
推荐引用方式 GB/T 7714	Lu Y.,Wang R.,Zhu Y.,et al. Two-dimensional fractal nanocrystals templating for substantial performance enhancement of polyamide nanofiltration membrane[J],2021,118(37).
APA	Lu Y..,Wang R..,Zhu Y..,Wang Z..,Fang W..,...&Jin J..(2021).Two-dimensional fractal nanocrystals templating for substantial performance enhancement of polyamide nanofiltration membrane.Proceedings of the National Academy of Sciences of the United States of America,118(37).
MLA	Lu Y.,et al."Two-dimensional fractal nanocrystals templating for substantial performance enhancement of polyamide nanofiltration membrane".Proceedings of the National Academy of Sciences of the United States of America 118.37(2021).