Composite particles comprising ferromagnetic particle, fluorescent pigment and a silica coating
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United States of America Patent
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Jun 3, 2008
Grant Date -
Mar 23, 2006
app pub date -
Mar 17, 2005
filing date -
Mar 19, 2004
priority date (Note) -
Expired
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Abstract
The present invention provides composite particles which have magnetism and simultaneously emit fluorescence with a variety of wavelengths, and which are suitable for use in the fields of biology, biochemistry or the like. The composite particles of the present invention comprise ferromagnetic iron oxide particles, fluorescent pigment particles and silica, and have an average particle size of 1 to 10 .mu.m, a coercive force of 2.39 to 11.94 kA/m (30 to 150 oersted), saturation magnetization of 0.5 to 40 A.m.sup.2/kg (0.5 to 40 emu/g). The peak value of the wavelength of fluorescence from the composite particle is in the range of 350 to 750 nm, when the composite particle is excited by light with a wavelength of 250 to 600 nm.
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