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Related Experiment Video

Updated: Oct 12, 2025

Biological Samples Preparation for Speciation at Cryogenic Temperature using High-Resolution X-Ray Absorption Spectroscopy

Biological Samples Preparation for Speciation at Cryogenic Temperature using High-Resolution X-Ray Absorption Spectroscopy

Published on: May 27, 2022

Passivation-driven speciation, dealloying and purification.

Andrew Martin¹, Boyce Chang, Joel Cutinho

¹Department of Materials Science and Engineering, Iowa State University, Ames, IA-50010, USA. mthuo@iastate.edu.

Materials Horizons

|November 25, 2021

Summary

This summary is machine-generated.

Surface oxides on metal alloys create gradients for selective separation and purification. This process enables redox-driven core enrichment and unique particle structures like

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Area of Science:

Materials Science
Metallurgy
Surface Chemistry

Background:

Passivating surface oxide layers on metal alloys create inherent free energy and composition gradients.
These gradients act as a dissipation horizon between dissimilar phases.

Purpose of the Study:

To exploit surface oxide gradients for selective separation and purification of metal alloys.
To enable redox-driven core enrichment by selective conversion of low standard reduction potential (E°) components into oxides.
To investigate novel particle morphologies resulting from engineered oxide growth during solidification.

Main Methods:

Utilizing the inherent free energy and composition gradients within surface oxides.
Employing redox-driven processes for selective conversion of alloy components.
Coupling oxide growth with volumetric changes during alloy solidification.
High-temperature X-ray diffraction for mechanism confirmation.
Characterization of solidification-trapped particle states.

Main Results:

Demonstrated selective surface separation (speciation) driven by oxide gradients.
Achieved redox-driven core enrichment through selective oxidation of low E° components.
Created unique 'ship-in-a-bottle' structures and extruded metal fingerlings.
Confirmed the underlying mechanisms via high-temperature X-ray diffraction and particle state characterization.

Conclusions:

Engineering passivating surface oxides enables purification via selective dealloying.
Concomitant core enrichment leads to the formation of disparate particle morphologies.
This approach offers a novel route for materials processing and functional particle design.