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Metallic Solids

Metallic Solids

Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....

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Updated: Feb 19, 2026

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

Interplay between shape and composition in bimetallic nanoparticles revealed by an efficient optimal-exchange

Felix Neumann¹, Johannes T Margraf², Emanuele Telari³

¹Chair of Theoretical Chemistry and Catalysis Research Center, Technische Universität München, Garching, Germany.

The Journal of Chemical Physics

|February 17, 2026

Summary

This summary is machine-generated.

The study reveals how the shape of platinum-gold (PtAu) nanoparticles changes with composition. Stable shapes shift from symmetric to distorted forms, impacting their catalytic properties.

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Area of Science:

Materials Science
Nanotechnology
Computational Chemistry

Background:

Bimetallic nanoparticles are crucial for heterogeneous catalysis.
Understanding the link between nanoparticle shape and composition is vital but challenging.

Purpose of the Study:

To investigate the relationship between shape and elemental composition in bimetallic nanoparticles.
To determine the lowest energy configurations for platinum-gold (PtAu) nanoparticles.

Main Methods:

Implementation and application of global optimization methods.
Utilizing an efficient optimal-exchange algorithm.
Leveraging local atomic contributions to an empirical surrogate energy expression.

Main Results:

The most stable shape of PtAu nanoparticles transitions from symmetric to distorted forms as composition changes.
Identified optimal atom exchanges by analyzing local atomic contributions.
Uncovered the origin of stability in distorted shapes due to favorable energy trade-offs.

Conclusions:

Particle shape significantly influences the stability and properties of bimetallic nanoparticles.
Distorted shapes in PtAu nanoparticles arise from specific atomic coordination preferences (Pt over-coordination, Au under-coordination).
The developed method provides insights into designing nanoparticles for catalysis.