Droplet Evaporation on a Hydrophobic Photothermal Conversion Substrate,Industrial & Engineering Chemistry Research

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Droplet Evaporation on a Hydrophobic Photothermal Conversion Substrate
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2021-03-01 , DOI: 10.1021/acs.iecr.1c00355
Haonan Li _{1,

2} , Rong Chen _{1,

2} , Xun Zhu _{1,

2} , Qiang Liao _{1,

2} , Dingding Ye _{1,

2} , Yang Yang _{1,

2} , Wei Li _{1,

2} , Dongliang Li _{1,

2} , Yijing Yang _{1,

2}

Affiliation

Use of the photothermal effect to control droplet evaporation shows great promise in various applications. Droplet evaporation initiated by direct photothermal conversion between light and fluid is limited by the interaction between the wavelength and fluid type. Here, we report laser-induced sessile droplet evaporation on a hydrophobic photothermal conversion substrate formed by embedding Ti₂O₃ particles into polydimethylsiloxane. Our results indicated that the photothermal conversion substrate could efficiently convert light energy into heat to enable droplet evaporation on it. Unlike droplet evaporation actuated by direct photothermal conversion, in which higher interface temperature was located at the laser projection region, the droplet evaporation on the photothermal conversion substrate showed higher temperature near the triple-phase contact line because of heat transfer from the substrate to the droplet and small heat transfer resistance resulting from small height at the edge. Due to the increased substrate temperature, the droplet evaporation on the photothermal conversion substrate could exhibit a relatively stable and long-term constant contact angle mode even under the localized heating effect. Moreover, by controlling the laser beam position, droplet evaporation could exhibit a directional long-term constant contact angle mode. The obtained results will be helpful for the design and operation of droplet microfluidics based on the photothermal conversion substrate.

中文翻译：

疏水性光热转化基质上的液滴蒸发

利用光热效应控制液滴的蒸发在各种应用中显示出巨大的希望。由光和流体之间直接的光热转换引发的液滴蒸发受到波长和流体类型之间相互作用的限制。在此，我们报告了在通过嵌入Ti ₂ O ₃形成的疏水性光热转换基板上的激光诱导的无固定液滴蒸发颗粒变成聚二甲基硅氧烷。我们的结果表明，光热转换基板可以有效地将光能转换为热量，从而使液滴能够在其上蒸发。与直接光热转换驱动的液滴蒸发不同，在较高的界面温度位于激光投影区域，与直接光热转换驱动的液滴蒸发不同，由于从基板到液滴的热传递，光热转换基板上的液滴蒸发在三相接触线附近显示出较高的温度。以及由于边缘高度较小而产生的较小的传热阻力。由于基板温度升高，即使在局部加热作用下，光热转换基板上的液滴蒸发也可以表现出相对稳定且长期恒定的接触角模式。而且，通过控制激光束的位置，液滴蒸发可以表现出方向性的长期恒定接触角模式。获得的结果将有助于基于光热转换基板的液滴微流控技术的设计和操作。

更新日期：2021-03-10

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