Polyamide membranes with nanoscale Turing structures for water purification
Polyamide membranes with nanoscale Turing structures for water purification
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用于水净化的具有纳米级图灵结构的聚酰胺膜
DOI：
10.1126/science.aar6308
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发表时间：
2018-05-04
期刊：
影响因子：
56.9
通讯作者：
Gao, Congjie
中科院分区：
文献类型：
--
作者：
Tan, Zhe;Chen, Shengfu;Gao, Congjie
图灵结构的出现具有至关重要的意义，设计这些结构并开发其应用在化学和生物学领域具有实际效果。我们采用一种基于界面聚合的简便方法来制备用于水净化的图灵型聚酰胺膜。通过控制反应条件来操纵形状，能够制造出具有气泡或管状结构的膜。这些膜表现出优异的水盐分离性能，超越了传统脱盐膜的上限线。此外，我们还表明在图灵结构中存在高水渗透率位点，在这些位点处，水通过膜的传输得到了增强。
Turing structures at the nanoscale Turing structures arise when imbalances in diffusion rates make a stable steady-state system sensitive to small heterogeneous perturbations. For example, Turing patterns occur in chemical reactions when a fast-moving inhibitor controls the motion of a slower-moving activator. Tan et al. grew polyamide membranes by using interfacial polymerization, where the reactions occur at the interface between oil and water layers. The addition of polyvinyl alcohol to the aqueous phase reduced the diffusion of the monomer. This process generates membranes with more bumps, voids, and islands, which prove to be better for water desalination. Science, this issue p. 518 Turing structures generated via diffusion-driven instabilities make polyamide membranes for water desalination. The emergence of Turing structures is of fundamental importance, and designing these structures and developing their applications have practical effects in chemistry and biology. We use a facile route based on interfacial polymerization to generate Turing-type polyamide membranes for water purification. Manipulation of shapes by control of reaction conditions enabled the creation of membranes with bubble or tube structures. These membranes exhibit excellent water-salt separation performance that surpasses the upper-bound line of traditional desalination membranes. Furthermore, we show the existence of high water permeability sites in the Turing structures, where water transport through the membranes is enhanced.