Tuning the energetics and tailoring the optical properties of silver clusters confined in zeolites

The integration of metal atoms and clusters in well-defined dielectric cavities is a powerful strategy to impart new properties to them that depend on the size and geometry of the confined space as well as on metal-host electrostatic interactions. Here, we unravel the dependence of the electronic properties of metal clusters on space confinement by studying the ionization potential of silver clusters embedded in four different zeolite environments over a range of silver concentrations. Extensive characterization reveals a strong influence of silver loading and host environment on the cluster ionization potential, which is also correlated to the cluster's optical and structural properties. Through fine-tuning of the zeolite host environment, we demonstrate photoluminescence quantum yields approaching unity. This work extends our understanding of structure property relationships of small metal clusters and applies this understanding to develop highly photoluminescent materials with potential applications in optoelectronics and bioimaging

Lipid droplets: a classic organelle with new outfits

Lipid droplets are depots of neutral lipids that exist virtually in any kind of cell. Recent studies have revealed that the lipid droplet is not a mere lipid blob, but a major contributor not only to lipid homeostasis but also to diverse cellular functions. Because of the unique structure as well as the functional importance in relation to obesity, steatosis, and other prevailing diseases, the lipid droplet is now reborn as a brand new organelle, attracting interests from researchers of many disciplines

訓詁與翻譯－理雅各英譯《左傳》管窺

Ultrasonic C-scan inspection techniques are widely used for the non-destructive evaluation of fiber-reinforced polymer composites. A C-scan is any two-dimensional scan of a specimen that produces a map of a parameter, such as reflected amplitude, as it varies across the surface of the specimen. The technique can be used to detect, measure and characterize a wide range of manufacturing and in-service defects in these materials. At present there is no international or national standard operational procedure available for ultrasonic C-scan inspection of fiber-reinforced composite structures—current standards are directed towards the inspection of metals