In what may sound like a project from a high school science fair, scientists are using a household humidifier to create porous spheres a hundred times smaller than a red blood cell. The technique is a new and inexpensive way to do chemistry using sound waves, the researchers say.
In the home, ultrasonic humidifiers are used to raise humidity, reduce static electricity and ease discomfort from the common cold or cough. In the lab, chemists at the University of Illinois at Urbana-Champaign are using the devices to make complex nanocomposite materials that could prove useful as catalysts in applications ranging from refining petroleum to making pharmaceuticals. The procedure is both simple and efficient.
"Normally, the chemical effects of ultrasound (called sonochemistry) are due to intense heating of small gas bubbles as they collapse in an otherwise cold liquid," said Kenneth S. Suslick, a William H. and Janet Lycan Professor of Chemistry at Illinois. "But in this case we are looking at using ultrasound to make very small liquid droplets and heating them while they are separated from one another in a heated gas. Its the inverse of what we do sonochemically."
James E. Kloeppel | EurekAlert!
Gelatine instead of forearm
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The nearby, giant radio galaxy M87 hosts a supermassive black hole (BH) and is well-known for its bright jet dominating the spectrum over ten orders of magnitude in frequency. Due to its proximity, jet prominence, and the large black hole mass, M87 is the best laboratory for investigating the formation, acceleration, and collimation of relativistic jets. A research team led by Silke Britzen from the Max Planck Institute for Radio Astronomy in Bonn, Germany, has found strong indication for turbulent processes connecting the accretion disk and the jet of that galaxy providing insights into the longstanding problem of the origin of astrophysical jets.
Supermassive black holes form some of the most enigmatic phenomena in astrophysics. Their enormous energy output is supposed to be generated by the...
The probability to find a certain number of photons inside a laser pulse usually corresponds to a classical distribution of independent events, the so-called...
Microprocessors based on atomically thin materials hold the promise of the evolution of traditional processors as well as new applications in the field of flexible electronics. Now, a TU Wien research team led by Thomas Müller has made a breakthrough in this field as part of an ongoing research project.
Two-dimensional materials, or 2D materials for short, are extremely versatile, although – or often more precisely because – they are made up of just one or a...
Two researchers at Heidelberg University have developed a model system that enables a better understanding of the processes in a quantum-physical experiment...
Glaciers might seem rather inhospitable environments. However, they are home to a diverse and vibrant microbial community. It’s becoming increasingly clear that they play a bigger role in the carbon cycle than previously thought.
A new study, now published in the journal Nature Geoscience, shows how microbial communities in melting glaciers contribute to the Earth’s carbon cycle, a...
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21.04.2017 | Physics and Astronomy