Electrowetting device and modification method capable of surface modification based on coffee ring effect

Abstract

The invention discloses a coffee-ring effect-based electric wetting device for surface modification and a modification method. The electric wetting device comprises a lower polar plate, wherein the lower polar plate consists of a substrate, an electrode layer, a medium layer and a drainage layer which are successively arranged from bottom to top; liquid droplets containing a modification substance is arranged on the drainage layer; the electrode layer comprises a plurality of transport electrodes and a plurality of modification electrodes, and every two electrodes are electrically isolated; the transport electrodes define a liquid droplet input path; and the modification electrodes are formed by a plurality of annular electrodes which are distributed from inside to outside, and a center position and an edge position of the liquid droplet can be determined based on an electric wetting effect by virtue of the modification electrodes. By controlling the transport and evaporation process of the liquid droplets, different substances are modified on different positions of the surface of the modification electrode. The modification method has the characteristics of novel design, simplicity in control, high automation degree and the like, and greatly enlarges the application range of techniques such as digital microfluidics and on-site rapid detection, and the like.

Description

technical field [0001] The invention belongs to the technical field of digital microfluidics, and relates to a microfluidic technology based on the principle of electrowetting on a dielectric layer and a liquid evaporation process, in particular to a surface for an electrowetting device on a dielectric layer based on the coffee ring effect Modified device and modification method. Background technique [0002] Lab-on-a-chip can be simply defined as a miniaturized and integrated micro-electro-mechanical system that can complete various processes of biochemical processing and automatically complete traditional laboratory functions. Its goal is to integrate a complete analysis process on a single device, with high integration High-precision, high-precision, low-consumption, intelligent and other advantages, it has very good prospects in many fields such as biology and chemistry. [0003] As the power part of lab-on-a-chip, microfluidic technology plays an important role. The e...

AI Technical Summary

Problems solved by technology

The electrowetting technology on the medium changes the wettability of the droplet on the surface of the medium by voltage to control the droplet. It has many advantages such as simple driving method, strong driving force, and high degree of automation, but it has disadvantages such as single function and low integration.

At the same time, the surface of the electrowetting device on the dielectric layer is covered with a relatively fragile hydrophobic layer, so it is difficult to modify its surface, which greatly limits its application in portable devices and lab-on-a-chip.

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