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Zhang, Shuailong; Juvert, Joan; Cooper, Jonathan; Neale, Steven (2016)
Languages: English
Types: Unknown
Subjects: QC
Optoelectronic tweezers (OET) or light patterned dielectrophoresis (DEP) has been proved to be an effective micromanipulation technology for cell sorting, cell separation and cell communications. Apart from being useful for cell biology experiments, the capability of moving small objects accurately also makes OET an attractive technology for other micromanipulation applications. In this work, we demonstrated the use of OET to manipulate conductive silver-coated Poly(methyl methacrylate) (PMMA) microspheres into different patterns. The silver-coated PMMA microspheres were suspended in deionized water and manipulated by positive DEP force generated by an OET device. It is found that the microspheres can be moved at a max speed of over 3000 ┬Ám/s, corresponding to around 4 nano-newton (10-9 N) DEP force, which is at least an order of magnitude stronger than the DEP force imposed on widely-reported glass and PMMA microspheres. Simulations were carried out to clarify the underlying mechanism and it is found that the strong DEP force is caused by the significant increase of the gradient of electric field due to the silver shells of the microspheres. The strong DEP force makes it possible to manipulate these metallic microspheres efficiently with high reliability, which is important for applications on electronic component assembling and circuit construction.

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