Scientists discover why gold never tarnishes

For millennia, gold has captivated humanity not only for its intrinsic value but also for its remarkable, unchanging luster. While commonly understood that gold doesn't readily react with oxygen, new research published in Physical Review Letters, as reported by N1 Serbia, reveals a more intricate reason behind its enduring shine: a self-protective mechanism at the atomic level.

Scientists at Tulane University have demonstrated that the atoms on gold's surface naturally rearrange themselves into specific patterns. These patterns act as a formidable barrier, drastically reducing the metal's reactivity with oxygen. This discovery provides a deeper scientific explanation for why gold jewelry and artifacts can remain untarnished for centuries, a phenomenon previously attributed simply to gold's inert chemical nature.

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People generally thought that gold doesn't tarnish simply because it doesn't react strongly with oxygen.

This groundbreaking insight, however, extends beyond mere curiosity about a precious metal. The researchers, led by Matthew Montemore, highlight the potential implications for industrial applications. While gold's resistance to oxidation is desirable for aesthetics and electronics, it can limit its use as a catalyst. Understanding how gold naturally forms these protective surfaces could pave the way for designing more effective gold-based catalysts, crucial for various chemical reactions in industries ranging from plastics production to environmental control, such as removing carbon monoxide from vehicle exhaust.

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What we have shown is that in the two most common types of gold surfaces, the atoms on the surface actually rearrange themselves in a way that makes gold much more resistant to oxidation.