基于振动诱导的硅表面微纳复合结构上冷凝液滴自迁移特性研究

本项目针对雾滴成分检测芯片的样品自动采集问题，提出了一种雾滴快速采集硅表面。硅表面上采用微机械工艺制作出V形槽-圆柱微纳米双层复合结构。通过微纳米结构的几何参数和硅基底的振动参数来控制雾滴冷凝过程中液滴的自迁移过程，实现雾滴样品快速采集，定向输送到雾滴成分检测芯片中。研究内容为：（1）采用热阻模型，研究纳米结构底部冷凝小液滴为PW-Cassie浸润状态时纳米结构几何参数范围。（2）基于液滴三相接触线固着-移动理论，研究基础振动条件下PW-Cassie小液滴转变为Cassie小液滴的动态行为。（3）基于接触线固着-移动理论，研究基础振动条件下V型槽斜面上Cassie小液滴的滚动行为。（4）基于接触线固着-移动理论，研究基础振动条件下V型槽中大液滴的定向运动行为。所提方法主要创新为通过微纳结构和基础振动来控制冷凝表面的液滴动态行为，快速定向集水。依据研究结果将开发出实用的雾滴成分快速检测芯片。

In this project, we propose a silicon surface for quickly collecting fog, which can be used as the input of the chip detecting the composition of fog. The surface is decorated with micro V-grooves and nano pillars and fabricated using micro machining method. By controlling the dimensions of micro-nano structures and vibration parameters of silicon base we control the droplet self-removing process during condensation to quickly collect fog samples and directionally transport them into the chip detecting the composition of fog. Study includes (1) Based on thermal resistance model, we study the dimensional scopes of nanostructures when the condensation droplets on the bottom of nanostructures are in PW-Cassie wetting state.(2) Based the contact line moving-sticking theory, we study the dynamic behaviors of transferring PW-Cassie droplets into Cassie droplets in base vibration conditions. (3) Based on liquid-solid-vapor interface theory, we study the rolling behaviors of the Cassie small droplets on inclined surfaces of V-grooves in base vibration conditions. (4) Based on liquid-solid-vapor interface theory, we study the directionally moving behaviors of big droplets in V-grooves. The novel point of proposed method is that by using micro-nano structures and base vibration we control the dynamic behaviors of droplets on condensation surface to directionally collectwater from fog. Based on study results we will develop the practical quickly-detecting chip for fog ingredients.