Effect of size and interparticle distance of nanoparticles on the formation of bubbles induced by nanosecond laser
Effect of size and interparticle distance of nanoparticles on the formation of bubbles induced by nanosecond laser
复制标题
DOI：
10.1016/j.surfin.2022.101820
复制
发表时间：
2022-06
影响因子：
6.2
通讯作者：
L. Mohan;Ren Hattori;Haipeng Zhang;Yuki Matsumura;T. Santra;T. Shibata;Sangjin Ryu;M. Nagai
中科院分区：
文献类型：
--
作者：
L. Mohan;Ren Hattori;Haipeng Zhang;Yuki Matsumura;T. Santra;T. Shibata;Sangjin Ryu;M. Nagai
当激光束照射到液体中的纳米粒子（光吸收体）时，会产生大量热量，导致附近液体蒸发，随后形成气泡。尽管这些气泡在癌症诊断和治疗、太阳能收集和局部化学反应增强方面具有潜在的应用，但人们对光学吸收体的尺寸和颗粒间距离如何影响激光诱导气泡的形成知之甚少。此外，由于纳米材料的快速增长和立即崩溃，观察纳米材料附近的气泡动力学具有挑战性。在这项研究中，我们使用水凝胶捕获气泡，并研究它们的直径如何随着纳米颗粒或其团聚物的尺寸和颗粒间距离以及激光照射的能量水平而变化。我们发现，随着水凝胶越软、激光能量水平越高、团聚体尺寸越大以及团聚体之间的颗粒间距离越小，截留气泡的尺寸就会增加。基于这些观察，我们认为最初在纳米粒子上形成的纳米气泡合并成为微气泡。
When a laser beam is irradiated on nanoparticles (optical absorbers) in a liquid, massive heat is generated, which causes vaporization of a nearby liquid, followed by the formation of bubbles. Despite the potential application of these bubbles for cancer diagnosis and therapy, solar energy harvesting, and local chemical reaction enhancement, little is known on how the size and interparticle distance of optical absorbers affect laser-induced bubble formation. Additionally, observing the bubble dynamics near nanomaterials is challenging due to their fast growth and immediate collapse. In this study, we trapped bubbles using hydrogels and investigated how their diameter changed with the size and interparticle distance of nanoparticles or their agglomerates and the energy level of laser irradiation. We found that the size of trapped bubbles increased with softer hydrogels, higher laser energy level, larger agglomerate size, and smaller interparticle distance among agglomerates. Based on these observations, we suggest that nanobubbles initially formed on nanoparticles merged to become microbubbles.