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Clay Edges Are Dynamic Proton-Conducting Networks Modulated by Structure and pH.

Yixuan Feng1, Xavier R Advincula2,3,4, Hongwei Fang1

  • 1State Key Laboratory of Hydro-science and Engineering, Department of Hydraulic Engineering, Tsinghua University, Beijing 100084, China.

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Summary
This summary is machine-generated.

Montmorillonite clay edges exhibit amphoteric behavior, dynamically conducting protons across various pH levels. This molecular-level understanding is key for environmental processes like catalysis and remediation.

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Area of Science:

  • Geochemistry
  • Environmental Science
  • Materials Science

Background:

  • Montmorillonite clay's geochemical importance stems from its complex edge surfaces.
  • Molecular-scale acid-base reactivity of montmorillonite edges is poorly understood.
  • Experimental and simulation limitations hinder detailed investigation.

Purpose of the Study:

  • To investigate the molecular-scale acid-base reactivity of montmorillonite edge surfaces.
  • To elucidate the mechanisms of proton transfer and surface charge regulation.
  • To provide a molecular-level framework for clay-water interactions.

Main Methods:

  • Utilized machine learning potentials for first-principles accuracy.
  • Performed nanosecond-scale molecular dynamics simulations.
  • Simulated montmorillonite nanoparticles across a range of pH.

Main Results:

  • Observed clear amphoteric behavior of montmorillonite edge sites.
  • Demonstrated pH-dependent protonation and deprotonation, regulating surface charge.
  • Identified spontaneous, directional proton transfer events even at neutral pH via direct and solvent-mediated pathways.

Conclusions:

  • Montmorillonite edges are dynamic, proton-conducting networks, not static hydroxyl groups.
  • Reactivity and charge state are modulated by local structure and solution conditions.
  • Provides a molecular framework for understanding proton transport and buffering in clay systems, impacting catalysis, ion exchange, and remediation.