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Feedback Control for Shaping Density Distributions of Colloidal Particles in Microfluidic Devices

Abstract

Directed self-assembly has great potential for the precise manufacture of structured materials at the micro/nano-scale. A local particle density often has to be controlled to make the assembly of complicated structures with no defects attainable. However, the control of spatial particle density distributions is challenged by the need for multiple actuators, kinetic trapping and the stochastic nature of self-assembly systems. In this paper, a novel feedback control approach for shaping spatial density distributions of colloidal particles is presented. The control objective is to maintain the ratio of the particle densities of two adjacent regions close to a desired value. A microfluidic device with a triple-parallel microelectrode is fabricated to provide multiple actuators for particle manipulation. The multiple-electrode actuators can be operated flexibly to either direct particles between two adjacent regions or to maintain particles within regions by preventing undesired particle movements. A feedback control scheme is implemented to control the density ratio over a broad range of tested set points. The method is generic and can be extended to include additional parallel electrodes for the control of density distributions at higher resolutions due to a modular design.

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Supplementary files

Publication details

The article was received on 23 Feb 2019, accepted on 13 May 2019 and first published on 14 May 2019


Article type: Paper
DOI: 10.1039/C9LC00192A
Lab Chip, 2019, Accepted Manuscript

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    Feedback Control for Shaping Density Distributions of Colloidal Particles in Microfluidic Devices

    Y. Gao and R. Lakerveld, Lab Chip, 2019, Accepted Manuscript , DOI: 10.1039/C9LC00192A

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