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    • 66. 发明申请
    • ELECTROMAGNETIC NANOCOMPOSITES AND METHODS OF MANUFACTURE
    • 电磁纳米复合材料及其制造方法
    • WO2009002569A2
    • 2008-12-31
    • PCT/US2008/051725
    • 2008-01-22
    • THE REGENTS OF THE UNIVERSITY OF CALIFORNIAGUO, ZhanhuPARK, SungHAHN, Thomas, H.
    • GUO, ZhanhuPARK, SungHAHN, Thomas, H.
    • H01L51/00
    • G01R33/093B82Y25/00
    • Nanocomposites of magnetic nanoparticles in a polymer matrix which has been heat treated is shown to have good giant magnetoresistance characteristics and structural integrity. The flexible nanocomposites were fabricated using a surface-initiated-polymerization (SIP) method. The uniformly distributed nanoparticles within the polymer matrix favor a continuous carbon matrix formation after heat treatment, rendering the transition from insulating to conductive composites. The coercive forces reflect strong particle loading and matrix dependent magnetic properties. One obtained nanocomposites possess fairly good giant magnetoresistance (MR), with a MR of 7.3 % at room temperature and 14 % at 130 K. Furthermore, the formed carbon matrix had a 7 wt.% argon adsorption potential for fuel cell applications. As an example, the method utilizing physicochemical adsorption of an initiator onto the iron-oxide (Fe 2 O 3 ) nanoparticle surface was used for urethane polymerization in a tetrahydrofuran (THF) solution.
    • 已经经过热处理的聚合物基质中的磁性纳米颗粒的纳米复合材料显示具有良好的巨磁阻特性和结构完整性。 使用表面引发聚合(SIP)方法制备柔性纳米复合材料。 在聚合物基质中均匀分布的纳米颗粒有利于热处理后的连续碳基体形成,从绝缘到导电复合材料的转变。 矫顽力反映强大的粒子负载和基于矩阵的磁性。 获得的纳米复合材料具有相当好的巨磁电阻(MR),在室温下MR为7.3%,在130K时为14%。此外,形成的碳基质具有用于燃料电池应用的7重量%的氩吸附潜力。 例如,在四氢呋喃(THF)溶液中使用利用引发剂在氧化铁(Fe 2 O 3)纳米粒子表面上的物理化学吸附的方法进行氨基甲酸酯聚合的方法。