ERA NanoSci - Directed and Autonomous Motion of Hybrid Magnetic Nano-objects

实现纳米物体之间的相互作用或交换的一个关键步骤是将它们带入空间附近的能力，例如通过诱导定向的个人或合作运动。我们开发了一种方法，利用不对称修饰的磁性纳米颗粒与交变磁场之间的相互作用来诱导纳米开关的平移运动。虽然推进驱动主要由磁粉磁头的性质和磁场参数决定，但在纳米物体运动中充当鞭毛的聚合物链的构象、螺旋度和刚性可能会受到例如溶剂(聚电解质)、温度(LCST/UCST聚合物)或pH(聚酸)的离子强度的影响。基于类似的综合概念，我们希望能够接触到由这些基本单元组成的更复杂的结构。

A key step in achieving interaction or exchange between nano-objects is the ability to bring them into spatial vicinity, e. g. by inducing directed individual or cooperative motion. We develop an approach making use of the interaction between asymmetrically decorated magnetic nanoparticles and an alternating magnetic field to induce translational movement of the nanoswimmers. While the propelling drive is mainly determined by the properties of the magnetic particle head and the magnetic field parameters, the conformation, helicity, and rigidity of the polymer chains that serve as flagella in the nano-object motion may be altered by e.g. ionic strength of the solvent (polyelectrolyte), temperature (LCST/UCST polymer) or pH (polyacid). Based on similar synthetic concepts, we expect to gain access to more sophisticated structures composed of these elementary units.