Angular Trapping of Anisometric Nano-Objects in a Fluid
Angular Trapping of Anisometric Nano-Objects in a Fluid
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DOI：
10.1021/nl303099c
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发表时间：
2012-11-01
期刊：
影响因子：
10.8
通讯作者：
Krishnan, Madhavi
中科院分区：
文献类型：
--
作者：
Celebrano, Michele;Rosman, Christina;Krishnan, Madhavi
我们展示了在定向单个各向异性纳米尺度中捕获、悬浮的能力。具有高角度的对象。流体中的精确度。静电流体捕捉器将球形物体限制在由静电系统自由能最小定义的空间位置。对于各向异性物体和缺乏角对称性的势井，系统自由能进一步强烈地依赖于物体在陷阱中的取向。因此，通过设计陷阱的形态，可以对单个悬浮纳米物体进行精确的空间和角度限制，并且该过程可以大规模并行化。由于陷阱的物理性质强烈依赖于物体的表面电荷，因此该方法对物体的介电函数不敏感。此外，利用外部施加的光、电或流体动力场，组装的物体的悬浮使它们易于单独操纵，从而增加了基于芯片的可重新配置的纳米物体组装的前景。
We demonstrate the ability to trap, levitate, in orient single anisometric nanoscale. objects with high angular. precision in a fluid. An electrostatic fluidic trap confines a spherical object at a spatial location defined by the minimum of the electrostatic system free energy. For an anisometric object and a potential well lacking angular symmetry, the system free energy can further strongly depend on the object's. orientation in the trap. Engineering the morphology of the trap thus enables precise spatial and angular confinement of a single levitating nano-object, and the process can be massively parallelized. Since the physics of the trap depends strongly on the surface charge of the object, the method is insensitive to the object's dielectric function. Furthermore, levitation of the assembled objects renders them amenable to individual manipulation, using externally applied optical, electrical, or hydrodynamic fields, raising prospects for reconfigurable chip-based nano-object assemblies.