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单分散Fe3O4纳米晶体的低磁场磁性分离

Cafer T Yavuz1, J T Mayo, William W Yu

  • 1Department of Chemistry, Rice University, 6100 Main Street, Houston, TX 77005, USA.

Science (New York, N.Y.)
|November 11, 2006
PubMed
概括

使用磁铁 (Fe3O4) 纳米晶体 (NCs) 的磁性分离即使在低磁场下也有效. 这些Fe3O4NCs通过利用它们的大小依赖的磁性特性,可以有效地去除和分离复杂的混合物.

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Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...