UCLA chemists report the discovery of a remarkable new nanoscale phenomenon: An ordinary camera flash causes the instantaneous welding together of nanofibers made of polyaniline, a unique synthetic polymer that can be made in either a conducting or an insulating form. The discovery, which the chemists call "flash welding," is published in the November issue of the journal Nature Materials.
Numerous applications potentially could result from this research in such areas as chemical sensors, separation membranes and nano devices. "We used an ordinary 35-millimeter camera, but you could also use a laser, or any other high-intensity light source," said Richard B. Kaner, UCLA professor of inorganic chemistry and materials science and engineering, and a member of the California NanoSystems Institute at UCLA.
"I was very surprised," Kaner said. "My graduate student, Jiaxing Huang, decided to take some pictures of his polyaniline nanofibers one evening when he heard a distinct popping sound and smelled burning plastic. Jiaxing recalled a paper that we had discussed during a group meeting reporting that carbon nanotubes burned up in response to a camera flash. By adjusting the distance of the camera flash to his material, he was able to produce smooth films with no burning, making this new discovery potentially useful."
Stuart Wolpert | EurekAlert!
Interfacial Superconductivity: Magnetic and superconducting order revealed simultaneously
17.01.2017 | Sonderforschungsbereich 668
Manchester scientists tie the tightest knot ever achieved
13.01.2017 | University of Manchester
Yersiniae cause severe intestinal infections. Studies using Yersinia pseudotuberculosis as a model organism aim to elucidate the infection mechanisms of these...
Researchers from the University of Hamburg in Germany, in collaboration with colleagues from the University of Aarhus in Denmark, have synthesized a new superconducting material by growing a few layers of an antiferromagnetic transition-metal chalcogenide on a bismuth-based topological insulator, both being non-superconducting materials.
While superconductivity and magnetism are generally believed to be mutually exclusive, surprisingly, in this new material, superconducting correlations...
Laser-driving of semimetals allows creating novel quasiparticle states within condensed matter systems and switching between different states on ultrafast time scales
Studying properties of fundamental particles in condensed matter systems is a promising approach to quantum field theory. Quasiparticles offer the opportunity...
Among the general public, solar thermal energy is currently associated with dark blue, rectangular collectors on building roofs. Technologies are needed for aesthetically high quality architecture which offer the architect more room for manoeuvre when it comes to low- and plus-energy buildings. With the “ArKol” project, researchers at Fraunhofer ISE together with partners are currently developing two façade collectors for solar thermal energy generation, which permit a high degree of design flexibility: a strip collector for opaque façade sections and a solar thermal blind for transparent sections. The current state of the two developments will be presented at the BAU 2017 trade fair.
As part of the “ArKol – development of architecturally highly integrated façade collectors with heat pipes” project, Fraunhofer ISE together with its partners...
At TU Wien, an alternative for resource intensive formwork for the construction of concrete domes was developed. It is now used in a test dome for the Austrian Federal Railways Infrastructure (ÖBB Infrastruktur).
Concrete shells are efficient structures, but not very resource efficient. The formwork for the construction of concrete domes alone requires a high amount of...
10.01.2017 | Event News
09.01.2017 | Event News
05.01.2017 | Event News
18.01.2017 | Life Sciences
18.01.2017 | Health and Medicine
17.01.2017 | Earth Sciences