Abstract
As a novel nano material with unique nanostructure and properties, carbon nanoparticles (CNPs) show a great potential for biomedical material and energy applications. A new method of the automatic assembly of CNPs using light induced AC electroosmotic (LI-ACEO) was proposed. Based on the theoretical analysis of CNPs in condition with a non-uniform electrical field, the theoretical model of the slip velocity and the frequency range of the pull-in AC voltage was established and derived with the optimal frequency of 1 kHz. Furthermore, the entire spatial distribution of the velocity caused by the LI-ACEO was simulated utilizing commercial finite element simulation software Comsol Multiphysics. Combing the computer vision surveillance and the digital projection systems, the automatic assembly of CNPs system utilizing the LI-ACEO method was constructed. Our experimental results of 50 nm CNPs prove that LI-ACEO is very effective for automatic assembly and accumulation of CNPs with a amplitude of 3 V and a frequency of 1 kHz. In addition, the height of the assembly of CNPs structure is ~1 μm. The technology based on the LI-ACEO also shows important applications for CNPs manipulation, assembly, 3D CNPs nano structure and nano sensor building.
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