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Nanoscale, 2015, 7,16054-16060
DOI: 10.1039/C5NR03732H, Paper
Ying-Jin Wang, Xiao-Yun Zhao, Qiang Chen, Hua-Jin Zhai, Si-Dian Li
Elongated planar boron clusters can serve as subnanoscale “tank treads”, whose peripheral ring rotates almost freely around the core at room temperature.
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http://nanochemistry.blogspot.com/2015/09/b11-moving-subnanoscale-tank-tread_24.html