Noble metal
Definition and Classification of Noble Metals
- Noble metals have little or no tendency to unite with oxygen in the free state.
- They do not alter the composition of water at a red heat.
- The oxides of noble metals are easily decomposed at temperatures below a red heat.
- The high electronegativity values of noble metals result in weakly polar covalent bonding with oxygen.
- Melting points of the oxides of noble metals are listed in the table.
Properties and Characteristics of Noble Metals
- Noble metals include gold, silver, platinum, palladium, and rhodium.
- They are resistant to corrosion and oxidation.
- Noble metals have high melting points and are good conductors of electricity.
- They are often used in jewelry and electrical contacts.
- Noble metals have catalytic properties and are used in various industrial applications.
Applications of Noble Metals
- Gold is used in dentistry, electronics, and as a store of value.
- Silver is used in photography, electrical contacts, and antimicrobial applications.
- Platinum is used in catalytic converters, fuel cells, and jewelry.
- Palladium is used in catalytic converters, electronics, and hydrogen purification.
- Rhodium is used in catalytic converters, glass production, and electroplating.
Environmental and Health Impacts of Noble Metals
- Mining and refining of noble metals can have environmental consequences.
- Noble metals can accumulate in ecosystems and affect aquatic organisms.
- Exposure to certain noble metals may have toxicological effects on human health.
- Efforts are being made to develop sustainable mining and recycling methods for noble metals.
- Proper disposal and recycling of noble metal-containing products are important to minimize environmental impacts.
Synthesis and Fabrication of Noble Metals
- Noble metals can be synthesized through various methods, including chemical reduction and electrochemical deposition.
- Fabrication techniques such as sputtering, evaporation, and electrodeposition are used to deposit noble metals onto substrates.
- Nanostructured noble metals have unique properties and find applications in sensors, catalysis, and optics.
- Atomic layer deposition is a precise technique used to deposit thin films of noble metals.
- Noble metal aerogels are emerging materials with potential applications in energy storage and catalysis.
Noble metal Data Sources
Reference | URL |
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Glossary | https://harryandcojewellery.com.au/blogs/glossary/noble-metal |
Wikipedia | http://en.wikipedia.org/wiki/Noble_metal |
Wikidata | https://www.wikidata.org/wiki/Q585302 |
Knowledge Graph | https://www.google.com/search?kgmid=/m/015cb9 |