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南京工业大学,新发Nature Communications!

  • 2026-04-21 00:43:53
南京工业大学,新发Nature Communications!

研究背景

在资源与环境领域,离子分离技术如同"分子筛"般关键,却长期面临一个棘手挑战:如何区分尺寸相近、性质相似的单价离子。以饮用水处理为例,氟离子过量会引发骨骼和牙齿疾病,而它与氯离子仅相差0.048纳米的"身材",让传统膜材料束手无策——就像在一群穿着相似的双胞胎中辨认特定一人。自然界早已给出答案:生物离子通道通过埃米级孔道中的精准识别位点,配合非对称结构实现离子"单向通行"。然而,将这一仿生智慧转化为可规模化生产的人工膜材料,需要跨越从纳米实验室到工业车间的鸿沟。金属有机框架(MOF)材料虽拥有理想的亚纳米孔道,但在与聚合物复合时,常因"水土不服"导致颗粒团聚、通道断裂,使得实际分离性能远低于理论预期。这一困境呼唤着既能保持MOF本征优势、又能和谐融入聚合物基体的新策略。

成果简介

南京工业大学孙世鹏教授提出"限域分子封装"(CME)策略,巧妙地化"冲突"为"协作":研究团队以金属有机凝胶(MOG)替代传统MOF晶体作为前驱体,利用其与聚合物更强的分子间相互作用,在溶液阶段便实现前驱体的均匀分散与"预限域";随后通过同步调控凝胶成核动力学与聚合物固化速率,使MOF在聚合物基体中"原位生长"为有序阵列。这一方法如同在混凝土浇筑的同时嵌入钢筋骨架,既避免了预制填料的团聚问题,又确保了界面紧密结合。所得混合基质膜展现出优异的氟/氯离子分离比(32.0)和离子整流效应,其性能根源在于有序MOF阵列产生的协同电场效应——计算机模拟揭示,这种结构能形成定向离子传输通道,让氟离子"优先通行"而氯离子"受阻滞留"。该策略为高性能离子分离膜的规模化制备提供了兼具科学深度与工程可行性的新范式。

图文导读

图1. PVDF/UiO-66-NH₂ MMMs的制备过程与表征

图2. MOFs和MOGs的结晶行为比较

图 3 基于 MOG 前驱体的膜内 MOF 可控生长

图4. 选择性离子传输和整流现象

图5. 离子整流和分离机制

总结展望

本研究创新性地提出"限域分子封装"(CME)策略,通过调控金属有机凝胶(MOG)前驱体与聚偏氟乙烯(PVDF)的分子间相互作用及成核动力学,实现了UiO-66-NH₂在聚合物基体中的原位可控生长,成功构建了具有仿生离子通道特性的混合基质膜。该膜在20 wt% MOG负载量下展现出高达32.0的F⁻/Cl⁻分离比及显著的离子整流效应,性能远超传统预合成MOF掺杂膜。分子动力学模拟揭示了MOG前驱体与PVDF间增强的范德华作用及氢键网络所诱导的限域扩散机制,而COMSOL多物理场模拟则阐明了有序MOF阵列通过协同表面电荷分布产生定向电场、驱动离子选择性传输的深层机理。该工作不仅为单/多价离子精准分离膜的设计提供了"动力学同步-结构限域"的新范式,更为面向水处理、资源回收及生物传感等领域的智能纳米流体器件开发奠定了材料基础;未来研究可进一步拓展至其他MOF拓扑结构及多元离子体系,探索外场响应型动态离子通道的构建,以推动仿生分离膜从实验室走向工程化应用。

文献信息

Chen, Q., Liu, ML., Jiang, S. et al. In-situ growth of biomimetic ion-selective membranes via confined molecular encapsulation for superior fluoride/chloride separation. Nat Commun (2026).

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  1. CONNECT:[ UseTime:0.000403s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000528s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.006381s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.002307s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000668s ]
  6. SELECT * FROM `set` [ RunTime:0.000291s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000627s ]
  8. SELECT * FROM `article` WHERE `id` = 519837 LIMIT 1 [ RunTime:0.000427s ]
  9. UPDATE `article` SET `lasttime` = 1777114979 WHERE `id` = 519837 [ RunTime:0.005139s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000296s ]
  11. SELECT * FROM `article` WHERE `id` < 519837 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000495s ]
  12. SELECT * FROM `article` WHERE `id` > 519837 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000511s ]
  13. SELECT * FROM `article` WHERE `id` < 519837 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000772s ]
  14. SELECT * FROM `article` WHERE `id` < 519837 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000842s ]
  15. SELECT * FROM `article` WHERE `id` < 519837 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000807s ]
0.099957s