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First atomic-scale real-time movies of platinum nanocrystal growth in liquids
Date:4/20/2012

They won't be coming soon to a multiplex near you, but movies showing the growth of platinum nanocrystals at the atomic-scale in real-time have blockbuster potential. A team of scientists with the Lawrence Berkeley National Laboratory (Berkeley Lab) and the University of California (UC) Berkeley has developed a technique for encapsulating liquids of nanocrystals between layers of graphene so that chemical reactions in the liquids can be imaged with an electron microscope. With this technique, movies can be made that provide unprecedented direct observations of physical, chemical and biological phenomena that take place in liquids on the nanometer scale.

"Watching real-time chemical reactions in liquids at the atomic-scale is a dream for chemists and physicists," says Jungwon Park, a member of the team who holds joint appointments with Berkeley Lab's Materials Sciences Division and UC Berkeley's chemistry department. "Using our new graphene liquid cell, we're able to capture a small amount of liquid sample under a high vacuum condition for taking real-time movies of nanoparticle growth reactions. Since graphene is chemically inert and extremely thin, our liquid cell provides realistic sample conditions for achieving high resolution and contrast."

Park was the lead author, along with Jong Min Yuk, of a paper in the journal Science that describes this research titled "High-Resolution EM of Colloidal Nanocrystal Growth Using Graphene Liquid Cells." The research was done as a collaboration between the research groups of Paul Alivisatos, director of Berkeley Lab and UC Berkeley's Larry and Diane Bock Professor of Nanotechnology, and Alex Zettl, who holds joint appointments with Berkeley Lab's Materials Sciences Division and UC Berkeley's Physics Department where he directs the Center of Integrated Nanomechanical Systems. Both are corresponding authors of the Science paper along with Jeong Yong Lee of Korea's Advanced Institute of Science and
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Contact: Lynn Yarris
lcyarris@lbl.gov
510-486-5375
DOE/Lawrence Berkeley National Laboratory
Source:Eurekalert  

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