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Colloidal precipitates01:09

Colloidal precipitates

601
The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
601

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Upscaled Synthesis Protocol for Phase-Pure, Colloidally Stable MXenes with Long Shelf Lives.

Nick Goossens1, Konstantina Lambrinou2, Bensu Tunca1

  • 1Department of Materials Engineering, KU Leuven, Leuven, BE-3001, Belgium.

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Summary

A new "next-generation minimally intensive layer delamination" (NGMILD) method synthesizes high-purity MXenes. This scalable protocol enhances etching efficiency and produces stable MXene clays with improved shelf life for industrial applications.

Keywords:
2D ceramicsMXenes oxidationchemical exfoliationcolloidal stabilitydegradation resistancesurface engineeringupscaling

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemical Engineering

Background:

  • MXenes are 2D conductive materials derived from MAX phases via etching and exfoliation.
  • Current synthesis routes, including minimally intensive layer delamination (MILD), face scalability challenges hindering industrial adoption.
  • Existing methods often result in impurities and limited shelf stability for MXenes.

Purpose of the Study:

  • To develop a scalable synthesis protocol for phase-pure, colloidally stable MXenes.
  • To improve the etching efficiency, intercalation, and long-term storage stability of MXenes.
  • To enable the industrial production and market deployment of MXenes.

Main Methods:

  • Introduction of a "next-generation MILD" (NGMILD) protocol.
  • Incorporation of a secondary salt, enriched lithium environment, and iterative alcohol washing.
  • Application of a sulfuric acid post-treatment to remove Li3AlF6 impurities.

Main Results:

  • Successful upscaled synthesis (50 g) of phase-pure Ti3C2Tz MXene clays with high yields (>22%).
  • Demonstrated colloidal stability and excellent redispersibility after six months of dry storage.
  • Achieved minimal degradation in dry-stored MXene clays, confirming enhanced shelf life.

Conclusions:

  • The NGMILD protocol offers a scalable and efficient method for producing high-purity MXenes.
  • This advancement addresses key limitations of previous MXene synthesis techniques.
  • NGMILD represents a significant step towards the industrialization and commercialization of MXene materials.