Scientists find that ice generates electricity when bent

fahrbot-bot writes: Phys.org is reporting on a study published in Nature Physics involving ICN2, at the UAB campus, Xi'an Jiaotong University (Xi'an) and Stony Brook University (New York), showing for the first time that ordinary ice is a flexoelectric material — meaning it can generate electricity when subjected to mechanical deformation.

"We discovered that ice generates electric charge in response to mechanical stress at all temperatures. In addition, we identified a thin 'ferroelectric' layer at the surface at temperatures below -113C (160K)," explains Dr. Xin Wen, a member of the ICN2 Oxide Nanophysics Group and one of the study's lead researchers.

"This means that the ice surface can develop a natural electric polarization, which can be reversed when an external electric field is applied—similar to how the poles of a magnet can be flipped. The surface ferroelectricity is a cool discovery in its own right, as it means that ice may have not just one way to generate electricity, but two: ferroelectricity at very low temperatures, and flexoelectricity at higher temperatures all the way to 0 C."

This property places ice on a par with electroceramic materials such as titanium dioxide, which are currently used in advanced technologies like sensors and capacitors.