Magnetic response of thermally blocked magnetic nanoparticles in a pulsed magnetic field
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- 作者：Andrea Prieto Astalan ; Christian Jonasson ; Karolina Petersson ; Jakob Blomgren ; Dag Ilver ; Anatol Krozer ; Christer Johansson
- 关键词：Magnetic nanoparticles ; Brownian relaxation ; Biosensor system ; Dynamic magnetic measurements ; Relaxometry
- 刊名：Journal of Magnetism and Magnetic Materials
- 出版年：2007
- 出版时间：April 2007
- 年：2007
- 卷：311
- 期：1
- 页码：166-170
- 全文大小：167 K
文摘
In order to detect fast changes of the Brownian relaxation time due to reaction kinetics on the surface of magnetic particles or particle-clustering processes, we have developed a method that uses pulsed magnetic fields and detects the relaxation of the magnetic response on the time scale of milliseconds. We compared measurements in the frequency domain with the time domain measurement using particle suspensions with three different median sizes. The results obtained with the two methods agreed well. Time domain determination of Brownian relaxation was then used to study the reaction kinetics of the clustering process when sodium chloride solution was added to a magnetic nanoparticle suspension.