Feedback control for defect-free alignment of colloidal particles†,Lab on a Chip

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Feedback control for defect-free alignment of colloidal particles†
Lab on a Chip ( IF 6.1 ) Pub Date : 2018-06-08 00:00:00 , DOI: 10.1039/c8lc00369f
Yu Gao _{1,

2,

3} , Richard Lakerveld _{1,

2,

3}

Affiliation

Precise alignment of small-scale building blocks into specific structural features is important for the manufacture of novel materials. Directed self-assembly is a promising route to align such small-scale building blocks with single-particle resolution. However, reliable alignment via directed self-assembly is challenging due to design uncertainty, randomness and potential disturbances acting on the system. This paper presents an integrated feedback control strategy to align colloidal particles reliably using directed self-assembly with electric field properties as manipulated variables in a microfluidic device. First, the particle density is controlled to make assembly of a defect-free structure attainable. Subsequently, a novel control method for particle alignment is implemented to self-assemble lines with single-particle resolution. The system's ergodicity is restricted systematically to assure that the density-control step at the higher hierarchy restricts the alignment-control step at the lower hierarchy. The method exploits several electrokinetic phenomena and all steps are fully automated. The approach is generic and can in principle be extended to include more density control steps to self-assemble more complicated structures.

中文翻译：

反馈控制可实现胶体颗粒的无缺陷排列†

将小型构建基块精确对准特定的结构特征对于制造新型材料很重要。定向自组装是将此类小型构建基块与单粒子分辨率对齐的一种有前途的途径。但是，通过由于设计的不确定性，随机性和对系统的潜在干扰，定向自组装具有挑战性。本文提出了一种集成的反馈控制策略，该方法使用具有电场特性的定向自组装作为微流体设备中的受控变量来可靠地对准胶体颗粒。首先，控制颗粒密度以实现无缺陷结构的组装。随后，实现了一种新颖的粒子对准控制方法，以具有单粒子分辨率的自组装线。系统的遍历性受到系统限制，以确保较高层次的密度控制步骤限制较低层次的对齐控制步骤。该方法利用了几种电动现象，并且所有步骤都是完全自动化的。

更新日期：2018-06-08

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