I have noticed that copper oxidation on copper nanoparticles often coincides with aggregation of nanoparticles into ,much larger clump in my experiments. I was hoping for some insight of literature that can help explain if these two mechanisms are correlation in nanoparticle oxidation, or if it is unique to the copper.
Dear Haidyn,
the melting point of metal powders decreases significantly when the size of their particles decreases. This phenomenon is all the more important as the particles are small. This phenomenon can be exploited in soldering products for the assembly of electronic components at low temperature (see attached documents and the associated bibliography). A lowered melting temperature indeed allows sintering at lower temperatures. Furthermore, it is known that the oxidation of a metal is exothermic. We could therefore assume that the oxidation of copper nanoparticles leads to a local temperature rise responsible for aggregation (sintering). What do you think?
Best regards.
Philippe.
Dear Haidyn Ogg This article can help you
10.1007/s11051-015-2865-0
Article Nanoparticle-electrode impacts: The oxidation of copper nano...
Haidyn Ogg
1. Oxidation of copper is a heterogeneous reaction, the rate of which increases with an increase in the specific surface area of nanoparticles.
2. The larger the specific surface of nanoparticles, the greater the tendency to aggregation of nanoparticles in a dispersed system.
Therefore, both oxidation and aggregation proceed together. You need to read about the reaction rate in physical chemistry, and about aggregation in colloidal chemistry. I can offer a summary of these two disciplines.
Data Yu. A. Mirgorod, R.V. Grebennikova. Glossary on Physical Chemistry
Data Yu.A.Mirgorod, R.V. Grebennikova. Glossary on Colloid Chemistry.
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