General Chemistry

Sunscreen and coral reef damage – in C&EN

Sunscreen protects our skin from the sun, but there’s also evidence that some of the lotion’s ingredients may damage coral reefs. The latest edition of Periodic Graphics looks at the responsible compounds and efforts to combat the problem. Click through to the Chemical and Engineering News site to view the full graphic. https://www.compoundchem.com/2019/07/21/sunscreen-reefs/

Effect of Diethylene Glycol Dimethyl Ether–Diesel Blends on Tribological Characteristics of Base Oils

In this study, tribological characteristics of diethylene glycol dimethyl ether (DGM)/diethylene glycol dimethyl ether–diesel blend A (10 vol% DGM + 90 vol% diesel)/diesel were compared after being subjected to quill roller-ball friction and four-ball friction tests. The lubricity and antiwear property of blend A were worse than those of diesel, albeit considerably better than those …

IYPT 2019 Elements 044: Ruthenium: Fountain pens and fingerprinting

Element 44 in our International Year of the Periodic Table series is ruthenium. This element finds uses in electronics, fountain pens, and in some fingerprinting techniques. Ruthenium is added to alloys of platinum and palladium used in electrical contacts. These are used as switches in a wide array of electronic devices. ‘Iridium’ fountain pen nibs …

IYPT 2019 Elements 043: Technetium: The periodic table’s first artificial element

Element 43 in our International Year of the Periodic Table series is technetium. The periodic table’s first artificially created element, its radioactivity allows it to be used in medical imaging. The artificial creation of element 43 was originally claimed by a group of German chemists in 1925. They named their newly discovered element masurium. However, …