Angular Trapping of Anisometric Nano-Objects in a Fluid

作者：Celebrano Michele; Rosman Christina; Soennichsen Carsten; Krishnan Madhavi^*

来源：Nano Letters, 2012, 12(11): 5791-5796.

DOI：10.1021/nl303099c

• Angular trapping
• electrostatic fluidic trap
• silver nanorods
• single particle scattering

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%26apos;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%26apos;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.

• 出版日期2012-11