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Global efforts have been made in the past two decades to efficiently manipulate and assemble tiny entities at micro-scale or even nano-scale. In this paper, we discuss our team's development of adding an interactive controller to the emerging optically-induced dielectrophoresis (ODEP) platform which could be used to rapidly and parallelly manipulate micro and nano particles in fluidic medium. We have...
This study reports an approach to dynamically separate cultured human B-lymphoma (Raji) cells from normal human red blood cells (RBCs), mixed in an isotonic solution, by utilizing a hydrogenated amorphous silicon-based optically-induced electrokinetics chip. A theoretical calculation of the polarization model for the two different types of cells is first presented. The differential velocity between...
We discuss in this paper a novel observation of self-induced rotational motion of pigmented biological cells in a dielectrophoretic force field. The experimental platform for our work is basically a microfluidic system fabricated with Au microelectrode on the glass substrate with PDMS microchannel irreversibly bonded on top of it. To investigate the cell movement in this microfluidic system due to...
This paper describes a process to perform nanoscale welding of multi-walled carbon nanotubes (MWCNTs) using a conductive atomic force microscopy (AFM) tip. An AFM tip can be used not only to apply a mechanical force to push, drag or scratch a sample, but also to exert an electrostatic force between the conductive tip and a sample substrate by applying a bias voltage. This electrostatic field will...
This paper describes the assembly of 2 nm gold nanoparticles between micro-fabricated planar electrodes by using dielectrophoresis (DEP). The optimal conditions for effectively dieletrophoretic manipulation have been established through theoretical analysis and experimental validation. In the theoretical analysis, the effect of Brownian motion was taken into consideration, as well as the electrothermal...
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