Selzer Lukas, Odenbach Stefan
Institute of Mechatronic Engineering, Technische Universität Dresden, George-Bähr-Str. 3, 01062 Dresden, Germany.
Gels. 2023 Mar 14;9(3):218. doi: 10.3390/gels9030218.
In a previous study, we presented an empirical law for the magnetorheological effect of nanocomposite hydrogels with magnetite microparticles derived from rheological data. In order to understand the underlying processes, we employ computed tomography for structure analysis. This allows the evaluation of the translational and rotational movement of the magnetic particles. Gels with 10% and 3.0% magnetic particle mass content are investigated at three degrees of swelling and at different magnetic flux densities in steady states by means of computed tomography. Since a temperature-controlled sample-chamber is difficult to implement in a tomographic setup, salt is used to deswell the gels instead. Based on the findings of the particle movement, we propose a mechanism using an energy-based approach. This leads to a theoretical law that shows the same scaling behavior as the previously found empirical law.
在之前的一项研究中，我们根据流变学数据提出了一种含磁铁矿微粒的纳米复合水凝胶磁流变效应的经验定律。为了理解其潜在过程，我们采用计算机断层扫描进行结构分析。这使得我们能够评估磁性颗粒的平移和旋转运动。通过计算机断层扫描，对质量含量为10%和3.0%的磁性颗粒凝胶在三种溶胀度下以及稳态下不同磁通密度进行了研究。由于在断层扫描装置中难以实现温度控制的样品室，因此使用盐来使凝胶消肿。基于颗粒运动的研究结果，我们提出了一种基于能量方法的机制。这导致了一个理论定律，该定律显示出与先前发现的经验定律相同的标度行为。
