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Related Experiment Video

Updated: Nov 15, 2025

Chemical Precipitation Method for the Synthesis of Nb2O5 Modified Bulk Nickel Catalysts with High Specific Surface Area

Chemical Precipitation Method for the Synthesis of Nb2O5 Modified Bulk Nickel Catalysts with High Specific Surface Area

Published on: February 19, 2018

Oxidation-induced three-dimensional morphological changes in Ni nanoparticles observed by coherent X-ray diffraction

Kangwoo Ahn¹, In Hwa Cho², Junhyung Kim¹

¹Department of Physics and Photon Science, Gwangju Institute of Science and Technology, Gwangju 61005, Korea.

Journal of Synchrotron Radiation

|March 2, 2021

Summary

Nickel nanoparticles transform into porous nickel oxide during oxidation. Researchers observed these nanoscale morphological changes non-destructively, revealing internal void formation and density variations.

Keywords:

NiO coherent X-ray diffraction imaging oxidation three-dimensional morphology

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Last Updated: Nov 15, 2025

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Published on: April 10, 2018

Area of Science:

Materials Science
Nanotechnology
Surface Chemistry

Background:

Nickel nanoparticles are crucial in catalysis.
Understanding their oxidation behavior is key to controlling catalytic activity.
Oxidation often leads to morphological changes impacting performance.

Purpose of the Study:

To visualize the three-dimensional (3D) structural evolution of nickel (Ni) nanoparticles during oxidation.
To non-destructively observe nanoscale morphological changes.
To understand the impact of oxidation on Ni nanoparticle structure and porosity.

Main Methods:

Coherent X-ray diffraction imaging was employed for non-destructive 3D structural analysis.
Nickel nanoparticles were oxidized to form nickel oxide (NiO).
High-resolution imaging techniques were used to identify internal structures and voids.

Main Results:

Nickel nanoparticles transformed into NiO with significant internal pore formation.
A large void was consistently observed at the lower corner of each nanoparticle, near the substrate interface.
The internal porosity of the agglomerated NiO reached approximately 38.4%.
Dense NiO regions were primarily located at the outer crust and near the large voids.

Conclusions:

Direct observation of oxidation-induced nanoscale morphological changes in Ni nanoparticles is achieved.
The study reveals specific void formation patterns and porosity in oxidized Ni nanoparticles.
Findings enhance the understanding of oxidation processes in catalytic materials.