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Colloidal precipitates

Colloidal precipitates

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...

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Updated: Jun 12, 2025

Synthesis of Bimetallic Pt/Sn-based Nanoparticles in Ionic Liquids

Synthesis of Bimetallic Pt/Sn-based Nanoparticles in Ionic Liquids

Published on: August 23, 2018

Why Colloidal Syntheses of Bimetallic Nanoparticles Cannot be Generalized.

Jette K Mathiesen¹, Hannah M Ashberry², Rohan Pokratath³

¹Department of Chemistry and Nano-Science Center, University of Copenhagen, Universitetsparken 5, Copenhagen 2100, Denmark.

|September 19, 2024

Summary

Synthesizing bimetallic nanoparticles (NPs) is crucial for energy applications. This study reveals that chemical interactions, not just reduction potentials, govern NP formation, enabling tailored synthesis for advanced materials.

Keywords:

bimetallic capping agents colloidal synthesis formation mechanism nanoparticles

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Last Updated: Jun 12, 2025

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Reverse Microemulsion-mediated Synthesis of Monometallic and Bimetallic Early Transition Metal Carbide and Nitride Nanoparticles

Published on: November 27, 2015

Area of Science:

Materials Science
Nanotechnology
Chemical Synthesis

Background:

Developing a general synthesis for bimetallic nanoparticles (NPs) is key for advancing energy applications.
Colloidal synthesis offers control but faces challenges due to complex multicomponent reactions and varying precursor reactivities.
The interplay between metal ion reduction potentials, metal surfaces, and capping agents in bimetallic NP formation remains incompletely understood.

Purpose of the Study:

To systematically investigate the influence of metal ion reduction potentials and cocapping agents on bimetallic NP formation.
To elucidate the competing factors that limit the mixing and formation of bimetallic NPs.
To provide insights for designing tailored multimetallic nanomaterials.

Main Methods:

Parametric investigation of bimetallic gold-copper (AuCu), gold-palladium (AuPd), and palladium-copper (PdCu) NP formation.
Utilized in situ X-ray total scattering, transmission electron microscopy (TEM), and nuclear magnetic resonance (NMR) spectroscopy.
Analyzed the roles of cocapping agents and metal ion coordination environments.

Main Results:

Cocapping agents play a multifunctional role, interacting with metal ion precursors and NP surfaces to stabilize metastable structures.
System-specific side reactions and local metal ion coordination environment can be leveraged to tune NP formation kinetics, structure, and morphology.
Demonstrated that chemical interactions, rather than intrinsic standard reduction potentials, are the primary determinants of bimetallic NP formation.

Conclusions:

The study clarifies the critical role of chemical interactions in the synthesis of bimetallic NPs.
Findings provide a foundation for the rational design and synthesis of novel multimetallic nanomaterials for diverse applications.
Highlights the importance of considering the holistic chemical environment in nanoparticle synthesis.