Cano M E, Castañeda-Priego R, Gil-Villegas A, Sosa M A, Schio P, de Oliveira A J A, Chen F, Baffa O, Graeff C F O
Centro Universitario de la Ciénega, Universidad de Guadalajara, Ocotlán, Jalisco, Mexico.
Photochem Photobiol. 2008 May-Jun;84(3):627-31. doi: 10.1111/j.1751-1097.2008.00302.x. Epub 2008 Feb 14.
We report an experimental and theoretical study of magnetic properties of synthetic eumelanin. The magnetization curves are determined by using both a vibrating sample magnetometer and a superconducting quantum interferometer device in an extended range of magnetic fields ranging from -10 kOe to 10 kOe at different temperatures. We find that the eumelanin magnetization can be qualitatively explained in terms of a simple model of dipolar spheres with an intrinsic magnetic moment. The latter one is experimentally measured by using X-band electron paramagnetic resonance. Our findings indicate that synthetic melanins are superparamagnetic.
我们报告了对合成真黑素磁性的一项实验和理论研究。通过在不同温度下，使用振动样品磁强计和超导量子干涉仪装置，在从-10 kOe到10 kOe的扩展磁场范围内测定磁化曲线。我们发现，真黑素的磁化可以用具有固有磁矩的偶极球体的简单模型进行定性解释。后者通过使用X波段电子顺磁共振进行实验测量。我们的研究结果表明，合成黑色素是超顺磁性的。
