基于韦森堡效应微笔直写技术的影响因素

Influence Factors of Micropen Direct Writing Technology Based on Weissenberg Effect

基于韦森堡效应设计出一套微笔直写的实验系统,研究了结构参数和工艺参数对供液规律以及直写规律的影响,以提供一种低成本、结构简易和高精度的直写装置。通过对比实验获得相关直写的最优工艺参数。研究发现,出口处液体形成理想的液体锥,更有利于直写应用。本系统的供液速度随微管道内径、微管道长度、液柱高度以及针芯转动速度的增加而增加。研究了直写速度、供液速度、笔尖高度和笔尖直径等参数对直写结构的影响,最后采用微管道内径300μm、针芯柱径100μm、针芯旋转速度5000 r/min、直写速度30 mm/s、笔尖高度100μm及笔尖直径100μm等相关直写的最优工艺参数,成功直写出聚氧化乙烯(PEO)液膜,并制备出多层微流控芯片。

Based on Weissenberg effect,a set of experimental system of micropen direct writing was designed,and the influences of structural parameters and process parameters on the liquid supply rules and direct writing rules were studied,so as to provide a kind of direct writing device with low cost,simple structure and high precision.The optimal process parameters for related direct writing were obtained by comparison of experiments.It is found that the liquid at the outlet forms an ideal liquid cone which is more conducive to the application of direct writing.The liquid supply speed of the system increases with the increases of the inner diameter of the micropipeline,the length of the micro-pipeline,the height of the liquid column and the rotating speed of the needle core.The influences of the parameters such as direct writing speed,liquid supply speed,nib height and nib diameter on the direct writing structure were studied.The optimal process parameters for related direct writing were obtained,such as the micro-pipeline inner diameter of 300μm,the needle core column diameter of 100μm,the needle core rotating speed of5000 r/min,the direct writing speed of 30 mm/s,the nib height of 100μm,the nib diameter of100μm and so on.With these optimal process parameters,the polyethylene oxide(PEO)liquid film was successfully straight written out and the multilayer microfluidic chip was prepared.