Gold has long been valued for its enduring shine, and new research from Tulane University sheds light on why it resists tarnishing. Published in Physical Review Letters, the study reveals that certain gold surfaces undergo atomic rearrangements that create a protective barrier against oxidation. This discovery challenges the previous belief that gold's lack of tarnish was solely due to its weak interaction with oxygen. Researchers Matthew Montemore and Santu Biswas found that these rearrangements suppress reactions with oxygen by a staggering factor of one billion to one trillion. This atomic-scale defense explains why gold jewelry can remain untarnished for centuries.

Moreover, while gold is already utilized in some catalytic processes, its oxidation resistance can limit its effectiveness. The research suggests that by manipulating the surface geometry of gold, it may be possible to enhance its catalytic properties, potentially improving its application in industrial reactions, such as in the production of vinyl acetate and in environmental cleanup efforts. This study opens new avenues for research into gold-based catalysts, highlighting the importance of surface structure in chemical reactions.