通过交流磁化率在七个数量级的频率范围内测量单分散磁铁矿纳米颗粒的尺寸依赖性弛豫特性。
Size-Dependent Relaxation Properties of Monodisperse Magnetite Nanoparticles Measured Over Seven Decades of Frequency by AC Susceptometry.
作者信息
Ferguson R Matthew, Khandhar Amit P, Jonasson Christian, Blomgren Jakob, Johansson Christer, Krishnan Kannan M
机构信息
Department of Materials Science, University of Washington, Seattle, WA 98195 USA.
Acreo AB, SE 400 16 Göteborg, Sweden.
出版信息
IEEE Trans Magn. 2013 Jul;49(7):3441-3444. doi: 10.1109/TMAG.2013.2239621.
Abstract
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.
摘要
磁弛豫被应用于磁性粒子的创新生物医学应用中，如磁粒子成像（MPI）、磁流体热疗和生物传感。应优化弛豫行为，以实现高性能成像、高效加热以及生物传感中的良好信噪比。通过使用两个频率范围重叠的交流磁化率测量仪，我们测量了一系列单分散磁性粒子的弛豫行为，并证明这种方法是探测从几赫兹到10兆赫兹（与MPI、热疗和传感相关的频率）的粒子弛豫特性的有效途径。
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