Scientists at Tulane University found why gold stays shiny. Gold atoms move to stop oxygen from changing the metal.

杜蘭大學的科學家發現了為什麼黃金能保持光澤。黃金原子會移動以阻止氧氣改變這種金屬。

Scientists used computers to look at gold. They saw that gold atoms move into special patterns. These patterns stop oxygen from touching the gold. This makes gold very strong against air and water.

科學家利用電腦研究黃金。他們發現黃金原子會移動成特殊的圖案。這些圖案能阻止氧氣接觸黃金。這使得黃金對空氣和水具有極強的抵抗力。

This is important for factories. Gold is too strong to help some chemical reactions. If scientists stop the atoms from moving, gold can help make clean energy.

這對工廠非常重要。黃金太過穩定，無法協助某些化學反應。如果科學家能阻止原子移動，黃金就能幫助製造潔淨能源。

Pure gold does not change color. But some jewelry has other metals like copper. These other metals change color and look dirty. Some soaps and skin acids also make this happen.

純金不會變色。但某些珠寶含有其他金屬，例如銅。這些其他金屬會變色，看起來很髒。某些肥皂和皮膚酸性物質也會導致這種情況。

The study explains why gold stays shiny and how to use it better in factories.

這項研究解釋了為什麼黃金能保持光澤，以及如何在工廠中更好地運用它。

Researchers at Tulane University have discovered that gold's durability is caused by a dynamic process where atoms rearrange themselves to prevent oxidation.

杜蘭大學的研究人員發現，黃金的耐用性源於一個動態過程，即原子透過自我重排來防止氧化。

For a long time, scientists believed that gold did not react with oxygen simply because it is a 'noble metal' with a stable electron structure. However, a study by Matthew Montemore and Santu Biswas, published in Physical Review Letters, emphasizes that a physical mechanism also helps this stability. By using advanced computer simulations, the researchers observed that gold atoms on the surface spontaneously organize into specific geometric patterns. Consequently, this structure acts as a barrier that reduces the rate of oxygen bonding by a factor of one billion to one trillion.

長期以來，科學家認為黃金不會與氧氣反應，僅僅是因為它是一種電子結構穩定的「貴金屬」。然而，Matthew Montemore 與 Santu Biswas 在《物理評論快報》上發表的一項研究強調，物理機制同樣有助於這種穩定性。研究人員透過先進的電腦模擬觀察到，表面的黃金原子會自發地組織成特定的幾何圖案。因此，這個結構扮演了屏障的角色，將氧氣結合的速度降低了十億至一兆倍。

This discovery is very important for industrial catalysis. While this atomic shield keeps gold looking new, it also makes gold-based catalysts less effective in producing chemicals or cleaning exhaust systems. The researchers asserted that if they could stop or reverse these surface changes, gold would be better at breaking down oxygen. This would improve its performance in green energy and manufacturing, offering a new alternative to traditional methods that mix gold with other metals.

這項發現對工業催化至關重要。雖然這種原子屏蔽讓黃金看起來始終如新，但也使得金基催化劑在生產化學品或清理排氣系統時效率降低。研究人員聲稱，如果能阻止或逆轉這些表面變化，黃金將能更有效地分解氧氣。這將提升其在綠色能源與製造業中的性能，為傳統地將黃金與其他金屬混合的方法提供一種新替代方案。

Furthermore, this explains why pure 24-karat gold differs from commercial alloys. Pure gold resists most pollutants; however, adding metals like copper, silver, or nickel to make it harder makes the jewelry more likely to tarnish. This process is often accelerated by skin acidity or exposure to chemicals like chlorine. In the case of white gold, the change in color is usually caused by the wearing away of the rhodium coating rather than a chemical reaction.

此外，這解釋了為什麼純 24K 金與商業合金不同。純金能抵抗大多數污染物；然而，為了增加硬度而加入銅、銀或鎳等金屬，會使珠寶更容易失去光澤。這個過程通常會因皮膚酸鹼度或接觸氯等化學物質而加速。以白金為例，顏色的改變通常是由於銠塗層的磨損，而非化學反應所致。

The study explains the atomic reason why gold does not tarnish and suggests a new way to make industrial catalysts more efficient.

這項研究解釋了黃金不會失去光澤的原子層原因，並提出了一種提高工業催化劑效率的新方法。

Researchers at Tulane University have determined that the durability of gold is attributed to a dynamic atomic restructuring process that inhibits oxidation.

杜蘭大學的研究人員確定，黃金的耐用性歸功於一種能抑制氧化的動態原子重組過程。

The prevailing scientific consensus previously attributed the non-reactive nature of gold to its status as a noble metal with a stable electron configuration. However, research conducted by Matthew Montemore and Santu Biswas, published in Physical Review Letters, indicates that this stability is augmented by a physical mechanism. Through the utilization of advanced computer simulations, the researchers observed that atoms on common gold surfaces spontaneously reorganize into geometric patterns. This structural reconfiguration serves as a kinetic barrier, reducing the rate of oxygen bonding by a factor of one billion to one trillion.

先前科學界的普遍共識將黃金的非反應特性歸因於其作為具有穩定電子組態的貴金屬。然而，由 Matthew Montemore 與 Santu Biswas 進行並發表於《物理評論快報》的研究指出，這種穩定性是由一種物理機制所增強的。透過使用先進的電腦模擬，研究人員觀察到常見黃金表面的原子會自發地重新排列成幾何圖案。這種結構重組充當了動力屏障，將氧氣結合的速率降低了十億至一兆倍。

This discovery possesses significant implications for the field of industrial catalysis. While the aforementioned atomic shield ensures the aesthetic longevity of the metal, it simultaneously diminishes the efficacy of gold-based catalysts in processes such as the production of vinyl acetate or the mitigation of carbon monoxide in exhaust systems. The researchers posit that if these surface rearrangements could be inhibited or reversed, the metal's capacity to dissociate oxygen would be enhanced, thereby optimizing its performance in green energy and manufacturing applications. This represents a departure from traditional methodologies, which typically rely on the integration of gold with other metals or the application of nanoparticles on oxide surfaces.

這項發現對工業催化領域具有重大影響。雖然上述的原子屏蔽確保了金屬的美學長久度，但同時降低了金基催化劑在生產乙酸乙烯酯或廢氣系統中減少一氧化碳等過程中的功效。研究人員認為，如果能抑制或反轉這些表面重組，金屬分解氧的能力將會提高，從而優化其在綠色能源與製造應用中的表現。這代表了對傳統方法的突破，傳統方法通常依賴於將黃金與其他金屬結合，或在氧化物表面應用奈米粒子。

Furthermore, the distinction between pure 24-karat gold and commercial alloys explains the variance in tarnish susceptibility. Pure gold remains impervious to most environmental pollutants; however, the addition of copper, silver, zinc, or nickel to increase hardness introduces elements prone to oxidation. The rate of this degradation is further accelerated by individual dermal acidity and exposure to chemical agents such as chlorine or ammonia-based cleaners. In the case of white gold, the observed discoloration is attributed to the mechanical attrition of the rhodium coating rather than a chemical reaction.

此外，純 24K 金與商業合金之間的區別，解釋了失去光澤程度的差異。純金對大多數環境污染物免疫；然而，為了增加硬度而加入的銅、銀、鋅或鎳，則引入了易於氧化的元素。這種退化速率會因個人皮膚酸鹼度以及接觸氯或氨基清潔劑等化學藥劑而進一步加速。在白金的情況下，觀察到的變色是由於銠塗層的機械磨損，而非化學反應。

The study clarifies the atomic basis for gold's resistance to tarnish and proposes a new methodology for enhancing industrial catalytic efficiency.

該研究闡明了黃金抗氧化的原子基礎，並提出了一種提高工業催化效率的新方法。