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Extraction: Advanced Methods

Extraction: Advanced Methods

Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...

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Updated: Apr 14, 2026

Preparation of Liquid-exfoliated Transition Metal Dichalcogenide Nanosheets with Controlled Size and Thickness: A State of the Art Protocol

Preparation of Liquid-exfoliated Transition Metal Dichalcogenide Nanosheets with Controlled Size and Thickness: A State of the Art Protocol

Published on: December 20, 2016

Interplay Between Exfoliation and Functionalization Strategies for Group VI Layered Transition Metal Dichalcogenide

Quoc Minh Tran¹, Pailinrut Chinwangso¹, Minh Dang Nguyen¹

¹Department of Chemistry and the Texas Center for Superconductivity, University of Houston, 4800 Calhoun Road, Houston, TX 77204-5003, USA.

Nanomaterials (Basel, Switzerland)

|April 13, 2026

Summary

Tailoring layered transition metal dichalcogenide (LTMD) dispersions is key for advanced applications. Exfoliation methods significantly impact LTMD properties and functionalization strategies.

Keywords:

colloids solution-processing exfoliation surface functionalization transition metal dichalcogenides

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Published on: December 5, 2015

Area of Science:

Materials Science
Nanotechnology
Surface Chemistry

Background:

Layered transition metal dichalcogenides (LTMDs) offer unique properties, especially in monolayer form, for applications in optoelectronics, energy storage, and sensing.
Scalable manufacturing techniques like spray coating and inkjet printing require tailored LTMD surface properties.
Exfoliation methods critically influence LTMD dispersion characteristics, affecting subsequent functionalization and material performance.

Purpose of the Study:

To systematically classify exfoliated Group VI LTMD dispersions based on their exfoliation methods.
To address challenges posed by exfoliation-method-dependent properties and dispersion heterogeneity.
To provide perspectives on surface functionalization and characterization of hybridized LTMD materials.

Main Methods:

Classification of LTMD dispersions according to exfoliation techniques.
Review of recent findings challenging existing assumptions in LTMD surface modification.
Analysis of surface functionalization approaches and characterization limitations.

Main Results:

Exfoliation methods significantly dictate the properties of LTMD dispersions.
Dispersion heterogeneity (flake size, thickness) presents a major challenge for consistent material behavior.
Established assumptions regarding LTMD properties and functionalization require re-evaluation.

Conclusions:

Understanding exfoliation-method-dependent properties is crucial for effective surface tailoring of LTMDs.
Standardized characterization methodologies are needed for reliable interpretation of hybridized LTMD materials.
Further research into surface functionalization and characterization is essential for unlocking the full potential of LTMDs.