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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: Apr 28, 2026

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

Adsorbate-induced structural changes in 1-3 nm platinum nanoparticles.

Yu Lei¹, Haiyan Zhao, Rosa Diaz Rivas

¹Energy Systems Division, ‡X-ray Science Division, §Chemical Sciences and Engineering Division, Argonne National Laboratory , Lemont, Illinois 60439, United States.

Journal of the American Chemical Society

|June 13, 2014

Summary

Platinum nanoparticle structure changes with hydrogen and carbon monoxide adsorption. Adsorbates like H2 and CO influence platinum-platinum bond distance and crystallinity, impacting nanoparticle properties.

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

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Published on: August 23, 2018

Area of Science:

Materials Science
Surface Science
Nanotechnology

Background:

Platinum nanoparticles exhibit unique properties influenced by their size and surface interactions.
Understanding nanoparticle behavior under adsorbate exposure is crucial for catalysis and materials design.

Purpose of the Study:

To investigate the impact of particle size and adsorbate type (H2, CO) on platinum nanoparticle structure.
To elucidate the relationship between adsorbate interactions and changes in Pt-Pt bond distance, crystallinity, and coordination.

Main Methods:

Synchrotron radiation pair distribution function (PDF) analysis.
X-ray absorption spectroscopy (XAS), including in situ X-ray near-edge absorption structure (XANES) measurements.

Main Results:

Platinum nanoparticles (∼1 nm) displayed a Pt-Pt bond distance contraction of ∼1.4%.
Adsorption of H2 and CO at room temperature relaxed this contraction towards bulk values.
H2 adsorption enhanced nanoparticle crystallinity, while CO adsorption induced a more disordered fcc structure due to electron back-donation.

Conclusions:

Adsorbate interactions significantly modify the structural and electronic properties of small platinum nanoparticles.
Electron back-donation from Pt to CO is a key factor in the observed structural disorder during CO adsorption.