Light must travel in a straight line and at a constant speed, or so the laws of nature suggest. Now, researchers have demonstrated that laser light traveling along a helical path through space, can accelerate and decelerate as it spins into the distance.
Chemists have devised an inexpensive, portable sensor that can detect gases emitted by rotting meat, allowing consumers to determine whether the meat in their grocery store or refrigerator is safe to eat.
This new technique, termed coaxial lithography (COAL), offers a combination of radial and longitudinal degrees of compositional freedom within the nanowire. Synthetic control over the radial dimension combined with the possibility of selectively deleting features used to build the nanowires significantly expands the range of architectures that can be synthesized using COAL.
New work shows how spray-drying prepared MOF nanoparticles containing lanthanide metals may be used as nanothermometers operative over a wide range of temperatures, in particular, in the cryogenic range.
When it comes to supramolecular chemistry, the carboxylic acid group - and its conjugate carboxylate base - is one of the chemist's most flexible friends. In pairs, they act as supramolecular synthons from which more complicated structures might be built but also offer up complex hydrogen bond connectivity.
Scientists affiliated with Europe's Graphene Flagship develop a photodetector that converts incident light into electrical signals on femtosecond timescales, enabling ultrafast operation speeds for electronic circuits in optical communications and various other applications.
Researchers have analyzed the varying thickness of printed toner in unprecedented 3-D detail, yielding insights that could lead to higher quality, less expensive and more environmentally-friendly glossy and non-glossy papers.