New material expands by a factor of 100 when electrocuted
by Brooks Hays
Washington (UPI) Oct 30, 2019
Scientists have discovered a new material that dramatically expands or contracts when exposed to a weak electrical signal.
Many materials expand and contract in response to changes in temperature and pH levels. Materials in greenhouse windows, for example, automatically open and close to help regulate the temperature. Similar materials, both solids and gels, are used in robots and biomedicine applications.
Until now, however, scientists had failed to find a material that can dramatically alter its volume -- ideally, triggering a phase change -- in response to electricity.
While making and testing experimental materials in the lab, researchers in Sweden and Britain synthesized a polymer that can both expand and contract in response to a weak electrical signal.
Scientists described the novel material this week in the journal Advanced Science.
When placed in an electrolyte solution, the material expands by a factor of 100 in response to a weak positive electrical pulse. A negatively charged pulse causes the material to return to its original volume.
In follow up experiments, scientists insulated a wire with the new material. When electricity was run through the wire, the thin film of polymer absorbed water and converted to a rapidly expanding gel. When scientists repeated stronger electrical pulses, the gel expanded to a volume 300 percent larger than the film's original size.
If integrated into a sponge or filter, scientists suggest the new material can manipulate via electricity to control the passage of different sized particles.
"We can control the pore size of a filter electronically, and potentially actively control the size of particles that pass through," Magnus Berggren, professor in organic electronics and director of the Laboratory of Organic Electronics at LinkĂ¶ping University, said in a news release.
"This means that the properties of this smart filter can be dynamically changed to allow different types or different sizes of particle to pass through. This function can be used for sieving, filtration, purification, and in process chemistry. It may also have applications in medicine and biochemistry," Berggren said.
Drexel researchers develop coal ash aggregate that helps concrete cure
Philadelphia PA (SPX) Oct 30, 2019
Coal ash is the less notorious byproduct of coal-fired power plants. It's the residual solid waste that comes from burning coal. While it doesn't have the same deleterious reputation of its airborne counterparts, tens of millions of tons of ash does up in landfills each year. Now researchers from Drexel University believe they have found a use for the powdery residue - one that could help make concrete more durable and crack-free. Recently reported in the journal Cement and Concrete Composites, th ... read more
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