Alle Elektronen tragen ein magnetisches Moment, Spin genannt, das grundsaetzlich in zwei Richtungen zeigen kann. Setzt man geeignete Nano-Roehrchen aus Kohlenstoff einem hohen Magnetfeld aus, so lassen sie bei einem bestimmten Wert nur Elektronen mit einer Spinrichtung durchfliessen. Erhoeht man das Magnetfeld weiter, so werden nur Elektronen mit der anderen Spinrichtung durchgelassen.
Tiny particles of iron oxide could become tools for simultaneous tumor imaging and treatment, because of their magnetic properties and toxic effects against brain cancer cells. In mice, researchers have demonstrated how these particles can deliver antibodies to implanted brain tumors, while enhancing tumor visibility via magnetic resonance imaging (MRI).
An innovation that can help scientists observe a reaction moving at greater than 10 meters per second, with a few nanometers spatial resolution, is a feat some would say is nearly impossible. But not the Lawrence Livermore team of scientists who developed the dynamic transmission electron microscope (DTEM).
In the quest for efficient, cost-effective and commercially viable fuel cells, scientists at Cornell University's Energy Materials Center have discovered a catalyst and catalyst-support combination that could make fuel cells more stable, conk-out free, inexpensive and more resistant to carbon monoxide poisoning.
A new process that simultaneously combines the light and heat of solar radiation to generate electricity could offer more than double the efficiency of existing solar cell technology. The process, called 'photon enhanced thermionic emission', or PETE, could reduce the costs of solar energy production enough for it to compete with oil as an energy source.
The Graduate School of Excellence 'Materials Science in Mainz' of Johannes Gutenberg University Mainz, Germany, honored Professor Shoucheng Zhang of Stanford University, California, USA, with the 2010 Gutenberg Research Award.
Hydrogen is considered the fuel of the future. Yet this lightest of the chemical elements can embrittle the metals used in vehicle engineering. The result: components suddenly malfunction and break. A new special laboratory is aiding researchers' search for hydrogen-compatible metals.
Researchers at the University of California, San Diego School of Medicine have identified a new way to regulate the uncontrolled growth of blood vessels, a major problem in a broad range of diseases and conditions.
The concentrations of toxic nitrogen oxide that are present in German cities regularly exceed the maximum permitted levels. That's now about to change, as innovative paving slabs that will help protect the environment are being introduced. Coated in titanium dioxide nanoparticles, they reduce the amount of nitrogen oxide in the air.