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    • 7. 发明授权
    • Magnetic particles having two antiparallel ferromagnetic layers and attached affinity recognition molecules
    • 具有两个反平行铁磁层和附着的亲和识别分子的磁性颗粒
    • US06337215B1
    • 2002-01-08
    • US08982019
    • 1997-12-01
    • Robert John Wilson
    • Robert John Wilson
    • G01N33353
    • B82Y25/00B03C1/01G01N33/54333G01N33/5434H01F1/0054H01F1/20H01F1/44H01F10/3268Y10S435/815Y10S530/811
    • Magnetic particles are prepared and used for selective separation of affinity bound partners in solution. The magnetic particles have large magnetic moments which can be made such that different strengths of magnetic moments and/or different magnetic field dependencies can be used to allow for separation of several affinity partners simultaneously. Magnetic particles having different magnetic moments and different attached acceptor molecules move at different rates in a magnetic field. The magnetic particles have a first ferromagnetic layer having a moment oriented in a first direction, a second ferromagnetic layer having a moment oriented in a second direction generally antiparallel to the first direction and a nonmagnetic spacer layer located between and in contact with the first and second ferromagnetic layers. The magnitude of the moment of the first ferromagnetic layer is substantially equal to the magnitude of the moment of the second ferromagnetic layer so that the magnetic particles have substantially zero net magnetic moment in the absence of an applied magnetic field. First and second antiferromagnetic layers may be in contact with and exchange coupled with the first and second ferromagnetic layers, respectively, for pinning the moments in the first and second directions. Affinity recognition molecules may be attached to a coating on the surface of the particles for selectively binding with a target molecule. When the recognition molecule is an antibody, the particles may be used in an immunoassay or to separate cells from a mixture by binding to cell surface antigens.
    • 制备磁性颗粒并用于溶液中选择性分离亲和键合的配偶体。 磁性颗粒具有大的磁矩,可以制成磁矩和/或不同的磁场依赖性的不同强度,以允许同时分离几个亲和配偶体。 具有不同磁矩和不同连接的受体分子的磁性颗粒在磁场中以不同的速率移动。 磁性颗粒具有第一铁磁层,其具有沿第一方向定向的力矩,第二铁磁层具有通常反向平行于第一方向的第二方向的力矩,以及位于第一和第二方向之间并与之接触的非磁性间隔层 铁磁层。 第一铁磁层的力矩的大小基本上等于第二铁磁层的力矩的大小,使得磁性颗粒在没有施加的磁场的情况下具有基本上零的净磁矩。 第一和第二反铁磁层可以分别与第一和第二铁磁层接触并与其交换,用于固定第一和第二方向上的力矩。 亲和识别分子可以连接到颗粒表面上的涂层,以选择性地与靶分子结合。 当识别分子是抗体时,该颗粒可以用于免疫测定中,或通过结合细胞表面抗原从混合物中分离细胞。
    • 9. 发明申请
    • Synthetic antiferromagnetic nanoparticles
    • 合成反铁磁性纳米粒子
    • US20080206891A1
    • 2008-08-28
    • US11894046
    • 2007-08-16
    • Shan X. WangRobert John WilsonWei Hu
    • Shan X. WangRobert John WilsonWei Hu
    • G01N33/553
    • G01N33/5434B03C1/01B82Y25/00H01F1/0054H01F10/3272
    • The present invention provides a synthetic antiferromagnetic (SAF) nanoparticle. The SAF nanoparticle includes at least two ferromagnetic layers and at least one non-magnetic spacer layer. The spacer layer is situated in between planar surfaces of the ferromagnetic layers. The saturation field of the SAF nanoparticle is tunable by the geometry and composition of the nanoparticle. Preferably, the saturation field can be tuned to be between about 100 Oe and about 10,000 Oe. Also preferably, the SAF nanoparticle has a magnetic moment of at least 800 emu/cm3. In a preferred embodiment, the SAF nanoparticle has at least one of a biomolecule, a recognition moiety, or a molecular coating attached to its surface. The SAF nanoparticle may also have a dye attached to its surface.
    • 本发明提供一种合成反铁磁(SAF)纳米颗粒。 SAF纳米颗粒包括至少两个铁磁层和至少一个非磁性间隔层。 间隔层位于铁磁层的平坦表面之间。 SAF纳米颗粒的饱和场可以通过纳米颗粒的几何形状和组成来调节。 优选地,饱和场可以调节在约100Oe和约10,000Oe之间。 还优选地,SAF纳米颗粒具有至少800emu / cm 3的磁矩。 在优选的实施方案中,SAF纳米颗粒具有附着于其表面的生物分子,识别部分或分子涂层中的至少一种。 SAF纳米颗粒也可以具有附着在其表面上的染料。