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在激光诱导的不同颗粒度的滴中抑制咖啡环效应

Peiying Han¹, Li Jun Yang¹, Zhaofei Zhu¹

¹School of Mechanical and Electrical Engineering, Shaanxi University of Science and Technology, Xi'an, Shaanxi 710021, China.

|August 25, 2025

概括

研究人员使用聚焦激光照射抑制了带颗粒的咖啡环效应. 这种方法控制了沉积模式, 对于喷墨印刷和自组装等应用至关重要.

科学领域:

材料科学
流体动力学
激光物理

背景情况:

咖啡环效应是一个常见的沉积模式,由蒸发的带有颗粒的液滴产生,受基质特性,液滴化学和外部条件的影响.
避免这种效应对于包括喷墨印刷,药物配方和自组装在内的应用至关重要.

研究的目的:

通过聚焦激光照射来抑制咖啡环效应的新方法.
通过调整激光参数和粒子度来控制微粒沉积模式.

主要方法:

聚焦绿色激光照射应用于含有微粒的液滴.
粒子度变化以观察它们对沉积模式的影响.
一个无维的参数,G,被引入来量化沉积模式.

主要成果:

在0.02%以下的颗粒度下,可以实现均的沉积模式.
在0.08%以上的颗粒度下形成的梯度图案.
均沉积结构与Gmax>10相关,而梯度结构与Gmax<2相关.

结论:

聚焦激光照射有效抑制咖啡环效应.
这种技术允许控制微粒沉积模式.
这项研究提供了对微粒组装激光诱导控制的见解.

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