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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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Related Experiment Video

Updated: Oct 19, 2025

Catalytic Reactions at Amine-Stabilized and Ligand-Free Platinum Nanoparticles Supported on Titania During Hydrogenation of Alkenes and Aldehydes

Catalytic Reactions at Amine-Stabilized and Ligand-Free Platinum Nanoparticles Supported on Titania During Hydrogenation of Alkenes and Aldehydes

Published on: June 24, 2022

Monolayer Support Control and Precise Colloidal Nanocrystals Demonstrate Metal-Support Interactions in Heterogeneous

Emmett D Goodman¹, Arun S Asundi¹, Adam S Hoffman²

¹Department of Chemical Engineering, Stanford University, Stanford, CA, 94305, USA.

Advanced Materials (Deerfield Beach, Fla.)

|September 18, 2021

Summary

This summary is machine-generated.

Precisely engineered catalysts reveal crucial metal-support interactions. Atomic layer deposition and nanocrystal synthesis enable sub-nanometer control, significantly boosting palladium-catalyzed methane combustion rates.

Keywords:

atomic layer deposition colloidal nanocrystals heterogeneous catalysis metal-support interactions monolayer control

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Synthesis and Catalytic Performance of Gold Intercalated in the Walls of Mesoporous Silica

Synthesis and Catalytic Performance of Gold Intercalated in the Walls of Mesoporous Silica

Published on: July 9, 2015

Area of Science:

Materials Science
Catalysis Science
Surface Chemistry

Background:

Metal-support interactions are vital for heterogeneous catalyst performance but difficult to investigate.
Understanding these interactions is key to designing more efficient catalysts.

Purpose of the Study:

To develop a method for precisely controlling the interface between metal and support phases in catalysts.
To investigate the impact of metal-support interactions on palladium-catalyzed methane combustion.

Main Methods:

Utilized atomic layer deposition (ALD) for monolayer-controlled formation of alumina (Al2O3) on silica (SiO2) supports.
Employed colloidal nanocrystal synthesis to deposit uniform palladium (Pd) nanocrystals with sub-nanometer precision.
Varied Al2O3 layer thickness from sub-monolayer to approximately 4 nm.

Main Results:

Observed significant changes in catalytic activity correlating with Al2O3 coverage and interface structure.
Demonstrated that even a single monolayer of alumina enhanced the reaction rate by an order of magnitude.
Established a direct link between controlled interfacial engineering and enhanced catalyst performance.

Conclusions:

Layer-by-layer construction of the Pd/Al2O3 interface allows detailed study of metal-support interactions.
Tunable catalyst design with sub-nanometer precision is critical for optimizing heterogeneous catalysis.
This approach provides fundamental insights into support effects for Pd-catalyzed reactions like methane combustion.