Magnetite 3D Colloidal Crystals Formed in the Early Solar System 4.6 Billion Years Ago

Three-dimensional colloidal crystals made of ferromagnetic particles, such as magnetite (Fe3O4), cannot be synthesized in principle because of the strong attractive magnetic interaction. However, we discovered colloidal crystals composed of polyhedral magnetite nanocrystallites of uniform size in th...

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Published in:Journal of the American Chemical Society 2011-06, Vol.133 (23), p.8782-8785
Main Authors: Nozawa, Jun, Tsukamoto, Katsuo, van Enckevort, Willem, Nakamura, Tomoki, Kimura, Yuki, Miura, Hitoshi, Satoh, Hisao, Nagashima, Ken, Konoto, Makoto
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container_end_page 8785
container_issue 23
container_start_page 8782
container_title Journal of the American Chemical Society
container_volume 133
creator Nozawa, Jun
Tsukamoto, Katsuo
van Enckevort, Willem
Nakamura, Tomoki
Kimura, Yuki
Miura, Hitoshi
Satoh, Hisao
Nagashima, Ken
Konoto, Makoto
description Three-dimensional colloidal crystals made of ferromagnetic particles, such as magnetite (Fe3O4), cannot be synthesized in principle because of the strong attractive magnetic interaction. However, we discovered colloidal crystals composed of polyhedral magnetite nanocrystallites of uniform size in the range of a few hundred nanometers in the Tagish Lake meteorite. Those colloidal crystals were formed 4.6 billion years ago and thus are much older than natural colloidal crystals on earth, such as opals, which formed about 100 million years ago. We found that the size of each individual magnetite particle determines its morphology, which in turn plays an important role in deciding the packing structure of the colloidal crystals. We also hypothesize that each particle has a flux-closed magnetic domain structure, which reduces the interparticle magnetic force significantly.
doi_str_mv 10.1021/ja2005708
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title Magnetite 3D Colloidal Crystals Formed in the Early Solar System 4.6 Billion Years Ago
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