Faculty of Physics, Adam Mickiewicz University, Poznań, Poland.
Nanotechnology. 2012 Sep 7;23(35):355704. doi: 10.1088/0957-4484/23/35/355704. Epub 2012 Aug 15.
Measurements of the Faraday rotation at room temperature over the light wavelength range of 300-680 nm for horse spleen ferritin (HSF), magnetoferritin with different loading factors (LFs) and nanoscale magnetite and Fe(2)O(3) suspensions are reported. The Faraday rotation and the magnetization of the materials studied present similar magnetic field dependences and are characteristic of a superparamagnetic system. The dependence of the Faraday rotation on the magnetic field is described, excluding HSF and Fe(2)O(3), by a Langevin function with a log-normal distribution of the particle size allowing the core diameters of the substances studied to be calculated. It was found that the specific Verdet constant depends linearly on the LF. Differences in the Faraday rotation spectra and their magnetic field dependences allow discrimination between magnetoferritin with maghemite and magnetite cores which can be very useful in biomedicine.
室温下，在 300-680nm 波长范围内，对马脾铁蛋白（HSF）、具有不同载流子因子（LF）的磁铁蛋白、纳米级磁铁矿和 Fe(2)O(3)悬浮液的法拉第旋转进行了测量。所研究材料的法拉第旋转和磁化呈现出相似的磁场依赖性，这是超顺磁系统的特征。除了 HSF 和 Fe(2)O(3)之外，通过具有对数正态分布的朗之万函数描述了法拉第旋转对磁场的依赖性，该函数允许计算所研究物质的核直径。结果发现，特定的Verdet 常数与 LF 呈线性关系。法拉第旋转光谱及其磁场依赖性的差异可以区分具有磁铁矿和磁赤铁矿核的磁铁蛋白，这在生物医学中非常有用。
