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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >An investigation into a micro-sized droplet impinging on a surface with sharp wettability contrast
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An investigation into a micro-sized droplet impinging on a surface with sharp wettability contrast

机译：微小液滴撞击具有明显润湿性对比的表面的研究

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An experimental investigation was conducted into a micro-sized droplet jetted onto a surface with sharp wettability contrast. The dynamics of micro-sized droplet impingement on a sharp wettability contrast surface, which is critical in inkjet printing technology, has not been investigated in the literature. Hydrophilic lines with line widths ranging from 27 to 53μm, and contact angle ranging from 17? to 77?, were patterned on a hydrophobic surface with a contact angle of 107?. Water droplets with a diameter of 81μm were impinged at various offset distances from the centre of the hydrophilic line. The evolution of the droplet upon impingement can be divided into three distinct phases, namely the kinematic phase, the translating phase where the droplet moves towards the centre of the hydrophilic line, and the conforming phase where the droplet spreads along the line. The key parameters affecting the conformability of the droplet to the hydrophilic line pattern are the ratio of the line width to the initial droplet diameter and the contact angle of the hydrophilic line. The droplet will only conform completely to the hydrophilic pattern if the line width is not overly small relative to the droplet and the contact angle of the hydrophilic line is sufficiently low. The impact offset distance does not affect the final shape and final location of the droplet, as long as part of the droplet touches the hydrophilic line upon impingement. This process has a significant impact on inkjet printing technology as high accuracy of inkjet droplet deposition and shape control can be achieved through wettability patterning.
机译：对喷射到具有明显润湿性对比的表面上的微细液滴进行了实验研究。在喷墨印刷技术中至关重要的，在尖锐的可润湿性对比表面上微小液滴撞击的动力学尚未在文献中进行研究。亲水线，线宽范围为27至53μm，接触角范围为17°在疏水表面上以107°的接触角构图到77°至77°的图案。直径为81μm的水滴以距亲水线中心不同的偏移距离撞击。液滴在撞击时的演变可分为三个不同的阶段，即运动阶段，液滴朝亲水线中心移动的平移阶段和液滴沿线扩散的顺应阶段。影响液滴对亲水性线图案的适应性的关键参数是线宽与初始液滴直径的比和亲水性线的接触角。如果线宽度相对于液滴不太小并且亲水线的接触角足够小，则液滴将仅完全符合亲水图案。碰撞偏移距离不影响液滴的最终形状和最终位置，只要液滴的一部分在撞击时接触亲水线即可。该工艺对喷墨打印技术有重大影响，因为可以通过润湿性图案化实现高精度的喷墨液滴沉积和形状控制。

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