Loading a High-Viscous Droplet via the Cone-Shaped Liquid Bridge Induced by an Electrostatic Force,Langmuir

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Loading a High-Viscous Droplet via the Cone-Shaped Liquid Bridge Induced by an Electrostatic Force
Langmuir ( IF 3.7 ) Pub Date : 2021-02-02 , DOI: 10.1021/acs.langmuir.0c03154
Xiao-yu Xu ₁ , Zheng Xu ₁ , Xiao-dong Wang ₁ , Shao-chun Qin ₁ , Yan-wen Qian ₁ , Li-ding Wang ₁ , Jun-shan Liu ₁

Affiliation

In transfer printing, the loaded droplet on the probe has a significant influence on the dispensing resolution. A suitable loading approach for a high-viscous liquid is highly required. Herein, a novel electrostatic loading method is presented, in which the main aim is to control precisely the formation and breaking of a cone-shaped liquid bridge. An experimental device is developed. The influence of electrical and geometric parameters on the feature size of the liquid bridge is investigated in detail. In the formation of the liquid bridge, the increase of voltage or the decrease of the air gap can enhance the electric field intensity, thus reducing the formation period and increasing the initial cone tip diameter of the liquid cone. After the liquid bridge is formed, both the circuit current implying the liquid wetted area on the probe surface and the lifting velocity of the probe are utilized to further regulate the volume of the loaded droplet. Loaded droplets ranging from 60 to 600 pL are obtained via the method with a standard deviation of 4 to 30 pL. Moreover, a dot array is transferred with different loaded droplets. The minimum diameter of the printed dots is about 140 μm with a variation less than 5%. The advantages include the reduced risk of contamination, the droplet-size independent of the size of the probe, and the low cost of the device.

中文翻译：

通过静电力诱导的圆锥形液体桥加载高粘度液滴

在转移打印中，探针上的液滴会严重影响点胶分辨率。高度需要用于高粘度液体的合适的装载方法。在此，提出了一种新颖的静电加载方法，其主要目的是精确控制锥形液体桥的形成和破坏。开发了实验装置。详细研究了电学参数和几何参数对液桥特征尺寸的影响。在液桥的形成中，电压的增加或气隙的减小可以增强电场强度，从而减少了形成时间并增加了液锥的初始锥尖直径。液桥形成后暗示探针表面上的液体润湿区域的电路电流和探针的提升速度都被用来进一步调节加载液滴的体积。通过该方法获得的负载液滴范围为60至600 pL，标准偏差为4至30 pL。而且，点阵以不同的加载液滴转移。印刷点的最小直径约为140μm，变化小于5％。优点包括降低了污染的风险，与探针大小无关的液滴大小以及设备的低成本。用不同的加载液滴转移点阵列。印刷点的最小直径约为140μm，变化小于5％。优点包括降低了污染的风险，与探针大小无关的液滴大小以及设备的低成本。用不同的加载液滴转移点阵列。印刷点的最小直径约为140μm，变化小于5％。优点包括降低了污染的风险，与探针大小无关的液滴大小以及设备的低成本。

更新日期：2021-02-23

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