Size-Dependent Relaxation Properties of Monodisperse Magnetite Nanoparticles Measured Over Seven Decades of Frequency by AC Susceptometry.
Size-Dependent Relaxation Properties of Monodisperse Magnetite Nanoparticles Measured Over Seven Decades of Frequency by AC Susceptometry.
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DOI：
10.1109/tmag.2013.2239621
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发表时间：
2013-07
影响因子：
2.1
通讯作者：
Krishnan KM
中科院分区：
文献类型：
--
作者：
Ferguson RM;Khandhar AP;Jonasson C;Blomgren J;Johansson C;Krishnan KM
磁弛豫被用于磁性粒子的创新生物医学应用，例如磁性粒子成像 (MPI)、磁流体热疗和生物传感。应优化弛豫行为，以在生物传感中实现高性能成像、高效加热和良好的信噪比。使用两个具有重叠频率范围的交流电感受器，我们测量了一系列单分散磁性颗粒的弛豫行为，并证明这种方法是探测几赫兹至 10 MHz 的颗粒弛豫特性的有效方法，这些频率与 MPI、热疗和传感相关。
Magnetic relaxation is exploited in innovative biomedical applications of magnetic particles such as magnetic particle imaging (MPI), magnetic fluid hyperthermia, and bio-sensing. Relaxation behavior should be optimized to achieve high performance imaging, efficient heating, and good SNR in bio-sensing. Using two AC susceptometers with overlapping frequency ranges, we have measured the relaxation behavior of a series of monodisperse magnetic particles and demonstrated that this approach is an effective way to probe particle relaxation characteristics from a few Hz to 10 MHz, the frequencies relevant for MPI, hyperthermia, and sensing.