论文标题
应用磁场对磁性纳米凝胶自组装的影响
The influence of an applied magnetic field on the self-assembly of magnetic nanogels
论文作者
论文摘要
使用Langevin动力学模拟，我们研究了存在中等强度的磁性磁场的磁性纳米凝胶的自组装。我们发现，即使弱场也会导致两者的结构因子，嵌入磁性纳米颗粒和整个纳米凝胶颗粒的急剧变化。纳米凝胶通过团结磁性颗粒簇组装，形成胶质间。在零场，一对纳米凝胶的这种桥的平均量接近一个，而对于弱场，它的平均桥也可以双倍。在施加场的低值下，簇大小的快速生长之后是一个较大增加的区域，这是由于施加了聚合物基质的机械约束而导致的。后者的影响在两者中都表现出来，在中间场的磁曲线的缓慢生长和总采能的缓慢衰变。
Using Langevin dynamics simulations, we investigate the self-assembly of magnetic nanogels in the presence of applied magneticfields of moderate strength. We find that even weak fields lead to drastic changes in the structure factors of both, the embeddedmagnetic nanoparticles and of whole nanogel particles. Nanogels assemble by uniting magnetic particle clusters forming inter-gelbridges. At zero field the average amount of such bridges for a pair of nanogels is close to one, whereas even for weak fields itfastly doubles. Rapid growth of cluster size at low values of the applied field is followed by a broad region of slow increase, causedby the mechanical constraints imposed the polymer matrix. The influence of the latter manifests itself in both, the slow growth ofthe magnetisation curve at intermediate fields and the slow decay of the total Zeeman energy.
