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ORNL microscopy yields first proof of ferroelectricity in simplest amino acid
Date:4/19/2012

OAK RIDGE, Tenn., April 19, 2012 The boundary between electronics and biology is blurring with the first detection by researchers at Department of Energy's Oak Ridge National Laboratory of ferroelectric properties in an amino acid called glycine.

A multi-institutional research team led by Andrei Kholkin of the University of Aveiro, Portugal, used a combination of experiments and modeling to identify and explain the presence of ferroelectricity, a property where materials switch their polarization when an electric field is applied, in the simplest known amino acidglycine.

"The discovery of ferroelectricity opens new pathways to novel classes of bioelectronic logic and memory devices, where polarization switching is used to record and retrieve information in the form of ferroelectric domains," said coauthor and senior scientist at ORNL's Center for Nanophase Materials Sciences (CNMS) Sergei Kalinin.

Although certain biological molecules like glycine are known to be piezoelectric, a phenomenon in which materials respond to pressure by producing electricity, ferroelectricity is relatively rare in the realm of biology. Thus, scientists are still unclear about the potential applications of ferroelectric biomaterials.

"This research helps paves the way toward building memory devices made of molecules that already exist in our bodies," Kholkin said.

For example, making use of the ability to switch polarization through tiny electric fields may help build nanorobots that can swim through human blood. Kalinin cautions that such nanotechnology is still a long way in the future.

"Clearly there is a very long road from studying electromechanical coupling on the molecular level to making a nanomotor that can flow through blood," Kalinin said. "But unless you have a way to make this motor and study it, there will be no second and third steps. Our method can offer an option for quantitative and reproducible study of
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Contact: Morgan McCorkle
mccorkleml@ornl.gov
865-574-7308
DOE/Oak Ridge National Laboratory
Source:Eurekalert  

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