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Updated: Aug 3, 2026

Creating Sub-50 Nm Nanofluidic Junctions in PDMS Microfluidic Chip via Self-Assembly Process of Colloidal Particles
Published on: March 13, 2016
Hierarchical Self-Assembly of Microphase-Separated Membranes Enables Contiguous Low-Resistance Channels for
Juntao Li1, Xinyue Li1, Niu Hu1
1School of Chemical Engineering, Zhengzhou University, Zhengzhou, P. R. China.
This study introduces a novel strategy for enhancing proton exchange membranes (PEMs) by creating aligned hopping sites, significantly improving proton conduction at low relative humidity (RH) while maintaining durability.
Area of Science:
- Materials Science
- Electrochemistry
- Polymer Science
Background:
- Proton conduction in proton exchange membranes (PEMs) is limited at low relative humidity (RH) due to suppressed Grotthuss mechanism.
- Engineering microphase separation with aligned hopping sites can promote Grotthuss mechanism but often compromises membrane durability.
- Developing durable PEMs with efficient proton conduction under low RH is crucial for fuel cell applications.
Purpose of the Study:
- To develop a hierarchical self-assembly strategy for introducing guest hopping sites into PEMs.
- To enhance proton conduction at low RH without sacrificing membrane durability.
- To investigate the mechanism shift from vehicle-mediated to Grotthuss proton transport.
Main Methods:
- Hierarchical self-assembly strategy incorporating acid-base hydrogen-bonded organic frameworks (ABHOFs).
- Regulating polyimide (PI) doping level in sulfonated polyetheretherketone (SPEEK) membranes.
- Characterization of microphase separation, acid-base pair ratio, and proton conductivity under varying RH.
Main Results:
- Optimal balance achieved at 13% bridged ─N─…SO3H─ acid-base pair ratio, promoting Grotthuss mechanism.
- SP/PI@ABHOF membranes exhibit high proton conductivities (193.6 mS cm- 1 at 100% RH, 50.8 mS cm- 1 at 20% RH) and peak power densities.
- Significant improvements in mechanical strength, cyclic stability, and hydrogen-permeation current density compared to benchmark membranes.
Conclusions:
- The proposed strategy effectively creates aligned guest-host hopping sites, enabling efficient proton transport via the Grotthuss mechanism under low RH.
- The developed SP/PI@ABHOF membranes demonstrate superior performance and durability for fuel cell applications.
- This approach offers a promising pathway for designing next-generation proton exchange membranes.
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