Research Article

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2016, 9(5): 1334–1345

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https://doi.org/10.1007/s12274-016-1029-6

Anisotropic nanowire growth via a self-confinedamorphous template process: A reconsideration onthe role of amorphous calcium carbonate

Li-Bo Mao1, Lei Xue1, Denis Gebauer2, Lei Liu1, Xiao-Fang Yu1, Yang-Yi Liu1, Helmut Clfen2, and Shu-Hong Yu1 (*)

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1 Division of Nanomaterials and Chemistry, Hefei National Laboratory for Physical Sciences at the Microscale Collaborative Innovation
Center of Suzhou Nano Science and Technology, CAS Center for Excellence in Nanoscience, Department of Chemistry, University of
Science and Technology of China, Hefei 230026, China
2 Department of Chemistry, University of Konstanz, Universittsstrasse 10, Box 714, D-78457, Konstanz, Germany

Keywords: amorphous calciumcarbonate,calcite nanowire,anisotropic growth,self-confined amorphoustemplate
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  • Abstract
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Calcium carbonate crystals with various morphologies have been found in avariety of biospecimens and artificially synthesized structures. Usually, thediversity in morphology can be attributed to different types of interactionsbetween the specific crystal faces and the environment or the templates used forthe growth of CaCO3 crystals. On the other hand, isotropic amorphous calciumcarbonate (ACC) has been recognized as the precursor of other crystallinecalcium carbonate forms for both in vivo and in vitro systems. However, here wepropose a self-confined amorphous template process leading to the anisotropicgrowth of single-crystalline calcite nanowires. Initiated by the assembly ofprecipitated nanoparticles, the calcite nanowires grew via the continuousprecipitation of partly crystallized ACC nanodroplets onto their tips. Then, thecrystalline domains in the tip, which were generated from the partly crystallizednanodroplets, coalesced in the interior of the nanowire to form a single-crystallinecore. The ACC domains were left outside and spontaneously formed a protectiveshell to retard the precipitation of CaCO3 onto the side surface of the nanowireand thus guided the highly anisotropic growth of nanowires as a template.
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Anisotropic nanowire growth via a self-confinedamorphous template process: A reconsideration onthe role of amorphous calcium carbonate. Nano Res. 2016, 9(5): 1334–1345 https://doi.org/10.1007/s12274-016-1029-6

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