Category Technology/Electronics

In order to create a material that is both strong and malleable and displays different behavior when exposed to more than one stimulus, researchers embedded light-responsive fibers, which are coated with spirobenzopyran (SP) chromophores, into a temperature-sensitive gel. This new material displays distinctly different behavior in the presence of light and heat. Credit: University of Pittsburgh

Combining photo-responsive fibers with thermo-responsive gels, researchers have modeled a new hybrid material that could reconfigure itself multiple times into different shapes when exposed to light and heat, allowing for devices that not only adapt to their environment, but also display distinctly different behavior in different stimuli.

“In 4D printing, time is the 4th dimension that characterizes...

An illustration of topological surface states in bismuth iodide as seen by angle-resolved photoemission spectroscopy. Credit: Oleg Yazyev (EPFL)

Topological insulators are materials that let electric current flow across their surface while keeping it from passing it through their bulk. This exotic property makes topological insulators very promising for electricity with less energy loss, spintronics, and perhaps even quantum computing. EPFL scientists have now identified a new class of topological insulators, and have discovered its first representative material, which could propel topological insulators into applications.

By theoretically testing potential candidates from the database of previously described materials, Oleg Yazyev EPFL team has identified a material, “crystalline phase” o...

(Left) Silicon wires with match heads and (right) light absorption profile of a single match-head wire at 587 nm absorption. Credit: Image courtesy of the Center for Integrated Nanotechnologies

Crystal growth on a nano/microscale level produces “match-head”-like, 3D structures that enhance light absorption and photovoltaic efficiency. This is the first large structure grown on a nanowire tip and it creates a completely new architecture for harnessing energy. Match-head semiconductor nanowires focus incident light for greater overall efficiency. The match heads are naturally formed during the wire-growth process, which can be applied to various materials and structures for photonic and optoelectronic devices.

Enhanced light absorption and efficient, photogenerated carrier collection are...

Conceptual design of the robot compared to a desert locust. Credit: Zaitsev, et al. ©2015 IOP Publishing Ltd

Researchers have built a locust-inspired robot that is just 5 inches long, 23 grams, but can jump 11 feet high and cover a horizontal distance of 4.5 ft. This jump height is more than twice the height of similar-sized jumping robots, and is 25X higher than its own length. The robot could have applications in search-and-rescue missions, reconnaissance, and environmental monitoring in rough terrain.

The team of researchers, Valentin Zaitsev, et al is from Tel Aviv University and Ort Braude College, Israel, which inspired the name of the robot: TAUB (Tel Aviv University and Braude College). “We demonstrate a design that is closer to nature,” Zaitsev...