Bioinspired Heterogeneous Ion Pump Membranes: Unidirectional Selective Pumping and Controllable Gating Properties Stemming from Asymmetric Ionic Group Distribution
Bioinspired Heterogeneous Ion Pump Membranes: Unidirectional Selective Pumping and Controllable Gating Properties Stemming from Asymmetric Ionic Group Distribution
复制标题
仿生异质离子泵膜：源于不对称离子基团分布的单向选择性泵送和可控门控特性
DOI：
10.1021/jacs.7b11472
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发表时间：
2018
影响因子：
15
通讯作者：
Jiang Lei
中科院分区：
文献类型：
--
作者：
Zhang Zhen;Li Pei;Kong Xiang Yu;Xie Ganhua;Qian Yongchao;Wang Ziqi;Tian Ye;Wen Liping;Jiang Lei
由于其在能量转换、生物传感器和海水淡化等方面的潜在应用，模仿生物蛋白质离子泵的精细离子输运行为的人工固态离子泵的创建引起了越来越多的研究关注。然而，已报道的生物激励双门离子泵系统一般都非常初级，只能实现非选择性的离子泵送功能，没有方向性和不可控的离子门控功能，这与它们的生物同行有很大的差距。为了使生物启发装置在真实的意义上“智能”，在离子泵送过程中实现高水平的选择性和方向性，同时在离子门控过程中实现很大的可控性是必要的。本文将嵌段共聚物膜牺牲涂层与等离子体接枝技术相结合，研制了一种仿生非均相离子泵膜。该系统具有单向选择性离子泵浦和可控离子门控特性。离子基团不对称分布的引入是其新颖输运行为的关键原因。这种异质离子泵不仅可以提供一个基础平台，可能引发进一步的努力来模拟智能离子在活体中的传输过程，而且还可以促进人工纳米流体设备在能量转换，水处理和生物传感中的应用。
The creation of an artificial solid-state ion pump that mimics the delicate ion transport behaviors of a biological protein-based ion pump is drawing more and more research attention due to its potential applications in energy conversion, biosensor, and desalination. However, the reported bioinspired double-gated ion pump systems are generally very primary and can only realize nonselective ion pumping functions with no directionality and uncontrollable ion gating functions, which are far from their biological counterparts. To make the bioinspired device “smart” in a real sense, the implementation of high-level selectivity and directionality in the ion pumping process, while achieving great controllability in the ion gating process, is a necessity. Here, we developed a bioinspired heterogeneous ion pump membrane by combining block copolymer membrane sacrificial coating and plasma grafting technique. The system has unidirectional selective ion pumping and controllable ion gating properties. The introduction of asymmetric ionic group distribution is the key reason for its novel transport behaviors. Such a heterogeneous ion pump could not only provide a basic platform that potentially sparks further efforts to simulate the smart ion transport processes in living bodies but also promote the application of artificial nanofluidic devices in energy conversion, water treatment, and biosensing.