论文标题
等离子体纳米颗粒悬浮液中的表面气泡动力学
Surface Bubble Dynamics in Plasmonic Nanoparticle Suspension
论文作者
论文摘要
了解血浆加热产生的微型表面气泡的动力学可以使广泛的应用范围诸如微流体，催化，微观图案和光热能量转换。通常，将表面等离子体气泡在受激光加热的表面预处理的等离子纳米结构上产生。在我们的研究中，我们研究了等离子纳米颗粒（NP）悬浮液中产生的表面微泡的生长动力学和运动机理。在第一部分中，我们观察到与具有表面等离子体结构的纯水相比，气泡生长速率要快得多。我们的分析表明，由于悬浮液中的NP存在，表面气泡周围的体积加热效果是解释这种差异的关键。在第二部分中，我们证明了固体表面上的表面气泡由激光指向高速移动（> 1.8 mm/s），我们通过快速沉积在气泡运动过程中的NPS中沉积的NPS加热来阐明该机制是三相接触线（TPCL）的脱位。
Understanding the dynamics of the micro-sized surface bubbles produced by plasmonic heating can benefit a wide range of applications like microfluidics, catalysis, micro-patterning and photo-thermal energy conversion. Usually, surface plasmonic bubbles are generated on plasmonic nano-structures pre-deposited on the surface subject to laser heating. In our studies, we have investigated the growth dynamics and movement mechanism of surface microbubbles generated in plasmonic nanoparticle (NP) suspension. In the first section, we observe much faster bubble growth rates compared to those in pure water with surface plasmonic structures. Our analyses show that the volumetric heating effect around the surface bubble due to the existence of NPs in the suspension is the key to explain this difference. In the second section, we demonstrate that surface bubbles on a solid surface are directed by a laser to move at high speeds (> 1.8 mm/s), and we elucidate the mechanism to be the de-pinning of the three-phase contact line (TPCL) by rapid plasmonic heating of NPs deposited in-situ during bubble movement.
