沙特阿卜杜拉国王科技大学Zhiping Lai团队开发了具有高离子通量和智能门控纳米流体输运的定向二维共价有机框架膜。相关研究成果于2021年11月23日发表在《德国应用化学》。

纳米流体离子传输在生物传感和能量转换应用领域中具有广阔的前景。然而，具有高离子通量和可调节离子传输能力的智能纳米流体装置仍有待实现。

该文中，研究人员展示了基于定向二维共价有机框架（2D COF）膜和垂直排列的纳米通道阵列的智能纳米流体装置，与传统单通道纳米流体装置相比，该装置实现了2–3个数量级的高离子通量。当电解液浓度达到0.01 M时，表面电荷控制的离子电导占主导地位。

此外，由于亚胺和苯酚羟基的可定制pH响应性，COF-DT膜实现了具有高pH门控开/关比~100的主动调节离子传输。COF材料可定制的结构和丰富的化学成分，将为制造具有可改变离子/分子传输特性的纳米流体器件提供一个有希望的平台。

附：英文原文

Title: Oriented Two-Dimensional Covalent Organic Framework Membranes with High Ion Flux and Smart Gating Nanofluidic Transport

Author: Li Cao, Xiaowei Liu, Digambar B. Shinde, Cailing Chen, I-Chun Chen, Zhen Li, Zongyao Zhou, Zhongyu Yang, Yu Han, Zhiping Lai

Issue&Volume: 2021-11-23

Abstract: Nanofluidic ion transport holds high promise in bio-sensing and energy conversion applications. However, smart nanofluidic devices with high ion flux and modulable ion transport capabilities remain to be realised. Herein, we demonstrate smart nanofluidic devices based on oriented two-dimensional covalent organic framework (2D COF) membranes with vertically aligned nanochannel arrays that achieved a 2–3 orders of magnitude higher ion flux compared with that of conventional single-channel nanofluidic devices. The surface-charge-governed ion conductance is dominant for electrolyte concentration up to 0.01 M. Moreover, owing to the customisable pH-responsivity of imine and phenol hydroxyl groups, the COF-DT membranes attained an actively modulable ion transport with a high pH-gating on/off ratio of ~100. The customisable structure and rich chemistry of COF materials will offer a promising platform for manufacturing nanofluidic devices with modifiable ion/molecular transport features.

DOI: 10.1002/anie.202113141

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202113141