Quantitative Evaluation of the Total Magnetic Moments of Colloidal Magnetic Nanoparticles: A Kinetics‐based Method |
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| Authors: | Haiyi Liu Prof Dr Jianfei Sun Haoyao Wang Peng Wang Lina Song Yang Li Bo Chen Prof Dr Yu Zhang Prof Dr Ning Gu |
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| Institution: | 1. State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing, Sipailou 2, 210096 (China);2. Jiangsu Key Laboratory of Biomaterials and Devices, Southeast University, Nanjing, Dingjiaqiao 87, 210009 (China);3. Collaborative Innovation Center of Suzhou Nano‐Science and Technology, Suzhou Key Laboratory of Biomaterials and Technologies, Suzhou, 215123 (China) |
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| Abstract: | A kinetics‐based method is proposed to quantitatively characterize the collective magnetization of colloidal magnetic nanoparticles. The method is based on the relationship between the magnetic force on a colloidal droplet and the movement of the droplet under a gradient magnetic field. Through computational analysis of the kinetic parameters, such as displacement, velocity, and acceleration, the magnetization of colloidal magnetic nanoparticles can be calculated. In our experiments, the values measured by using our method exhibited a better linear correlation with magnetothermal heating, than those obtained by using a vibrating sample magnetometer and magnetic balance. This finding indicates that this method may be more suitable to evaluate the collective magnetism of colloidal magnetic nanoparticles under low magnetic fields than the commonly used methods. Accurate evaluation of the magnetic properties of colloidal nanoparticles is of great importance for the standardization of magnetic nanomaterials and for their practical application in biomedicine. |
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| Keywords: | bioelectronics colloids droplet kinetics magnetic properties nanoparticles |
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