light tagged posts

Time-averaged local volume fraction ϕ(r) of interacting and noninteracting particles in a system with spatially patterned one-particle swim speed v(r), where v = vi = v0(1 – i/16) in the ith well and v = v0 between the wells. The solid lines show our predictions with a prefactor determined by least-squares fits, where we neglected the three highest density (ϕ > 0.5) data points for the interacting particles. Inset: Spatially resolved plot of ϕ(r) for the interacting particles; note the logarithmic scale on the color bar.

Light of a certain wavelength can be used to put so-called active materials into motion and control their movement...

By simply shining the right color of light on the graphene, contaminants and light-sensitive soap mixture, the graphene clusters together and sinks; shining a different color of light re-disperses it for re-use. Credit: Monash University

A simple effective way of capturing graphenes and the toxins, contaminants they attract from water by using light has been found. The findings could have significant implications for large-scale water purification. A small amount of a special light-sensitive soap was added to the water containing the graphenes and contaminants. The soap changes its molecular structure when light of a particular colour is shone onto it...

Electroluminescence from vertically stacked GaN–Al2O3–MoS2–Al2O3-graphene heterostructures.

1st demo of electroluminescence from multilayer molybdenum disulfide, or MoS2, a discovery that could lead to a new class of materials for making LEDs. In its single-layer form, Mos2 is optically active, meaning that it emits light when electric current is run through it or when it is shot with a nondestructive laser. Multilayer molybdenum disulfide, by contrast, is easier and less expensive to produce, but it is not normally luminescent. In the new study, Duan and Dehui, created the 1st multilayer device that shows strong luminescence when electrical current is passed through it.

“It was rather surprising for us to discover that similar vertical devices made of multilayer MoS2 somehow showed ...