Nanoparticle-Mediated Cavitation via CO2 Laser Impacting on Water: Concentration Effect, Temperature Visualization, and Core-Shell Structures
Nanoparticle-Mediated Cavitation via CO2 Laser Impacting on Water: Concentration Effect, Temperature Visualization, and Core-Shell Structures
复制标题
通过 CO2 激光撞击水实现纳米粒子介导的空化：浓度效应、温度可视化和核壳结构
DOI：
10.1038/s41598-019-54531-1
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发表时间：
2019-12-04
影响因子：
4.6
通讯作者：
Deng, Daosheng
中科院分区：
文献类型：
--
作者：
Hu, Man;Wang, Feng;Deng, Daosheng
通过利用种子聚合物纳米粒子和强大的光能吸收，我们报道了CO2激光撞击水在空气/水界面产生空化。使用高速相机，在纳米颗粒浓度和尺寸的大范围内识别出三种状态(无空化、空化和假空化)。利用热像仪直接观测温度的时空演变，揭示了空化、纳米颗粒和温度之间的内在联系。这些发现表明，纳米颗粒不仅作为预先存在的核促进空化成核，而且可能还会影响温度来改变成核速率。此外，通过利用正己烷/水的复合界面，展示了一种新的核壳空化。这种方法可以通过选择纳米粒子和设计界面来获得和控制空化，同时在较低的激光强度下操作，用于材料科学和医学外科的各种技术应用。
By taking advantage of seeded polymer nanoparticles and strong photo energy absorption, we report CO2 laser impacting on water to produce cavitation at the air/water interface. Using a high-speed camera, three regimes (no cavitation, cavitation, and pseudo-cavitation) are identified within a broad range of nanoparticles concentration and size. The underlying correlation among cavitation, nanoparticles and temperature is revealed by the direct observation of spatiotemporal evolution of temperature using a thermal cameral. These findings indicate that nanoparticles not only act as preexisted nuclei to promote nucleation for cavitation, but also likely affect temperature to change the nucleation rate as well. Moreover, by exploiting a compound hexane/water interface, a novel core-shell cavitation is demonstrated. This approach might be utilized to attain and control cavitations by choosing nanoparticles and designing interfaces while operating at a lower laser intensity, for versatile technological applications in material science and medical surgery.