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Updated: May 22, 2025
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Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes
Published on: August 16, 2018
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Continuous porous aromatic framework membranes with acid-/base-induced reversible isomerization for switchable ion
Jian Song1, Hengtao Lei1, Lin Lin1
1Key Laboratory of Polyoxometalate and Reticular Material Chemistry of Ministry of Education, Faculty of Chemistry, Northeast Normal University Changchun Jilin 130024 China tianyy100@nenu.edu.cn zhugs@nenu.edu.cn.
Chemical Science
|March 17, 2025
Summary
Researchers developed novel porous aromatic frameworks (PAFs) for acid/base switchable ion conductors. These smart materials exhibit significant conductivity changes in response to pH, enabling new applications in harsh chemical environments.
Area of Science:
- Materials Science
- Chemical Engineering
- Nanotechnology
Background:
- Stimuli-responsive ion conductors are crucial for advanced applications like clean energy and smart devices.
- Developing materials with tunable ion conductivity based on environmental stimuli, particularly pH, remains a significant challenge.
- Existing materials often struggle with structural stability, porosity, and reversible responses required for acid/base switching.
Purpose of the Study:
- To design and synthesize novel porous aromatic frameworks (PAFs) capable of reversible structural changes in response to acidic and alkaline conditions.
- To investigate the ion-conducting properties of these PAFs and their corresponding membranes.
- To demonstrate the feasibility of achieving a significant, switchable ion conductivity based on acid/base stimuli.
Main Methods:
- Utilized porous aromatic frameworks (PAFs) as a platform for material design.
- Incorporated a commercially available pH indicator into the PAF structure.
- Fabricated both ion-conductive PAF powders and continuous membranes.
- Characterized structural reversibility and ion conductivity under varying pH and humidity conditions.
Main Results:
- The synthesized PAFs exhibited reversible structural changes in response to acidic and alkaline environments.
- Achieved a significant ion-conducting switch of approximately 4 orders of magnitude (10-7 S cm-1 to 10-3 S cm-1) under specific conditions (25 °C, 98% RH).
- The continuous PAF membrane demonstrated ultrahigh ion conductivity (7.29 × 10-1 S cm-1) after NaOH treatment and showed good acid/base switchable cycle stability.
Conclusions:
- This study presents the first report of ion-conductive porous frameworks and membranes that dynamically respond to acid/base chemical stimuli.
- The developed PAFs offer a promising new strategy for creating "smart" ion conductor materials.
- These materials show potential for applications even in harsh chemical environments, advancing fields like biological systems, clean energy, and smart devices.
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