Real-Time Optical Measurements of Nanoparticle-Induced Melting and Resolidification Dynamics
Real-Time Optical Measurements of Nanoparticle-Induced Melting and Resolidification Dynamics
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纳米颗粒引起的熔化和再凝固动力学的实时光学测量
DOI：
10.1021/acsnano.2c09212
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发表时间：
2023
期刊：
影响因子：
17.1
通讯作者：
Dragnea, Bogdan
中科院分区：
文献类型：
--
作者：
Jo, Suhun;Schaich, William L.;Dragnea, Bogdan
采用全光学方法实时研究了围绕纳米颗粒的分子材料薄层的快速熔化和再凝固的光热诱导纳米尺度动力学。该方法采用脉冲周期调制介质的介电常数，通过吸收低占空比激光脉冲串由单个纳米颗粒作为局部热源。对实验数据的解释，包括相变和液/固界面动力学的推断，是通过将实验数据与耦合光学-热数值模拟的结果进行比较得到的。在这项原理验证研究中提出的结合实验/计算工作流程将使未来的材料参数在纳米尺度上的探索成为可能，这些参数通常与它们的体积值不同，并且在许多情况下难以从宏观测量中推断出来。
The photothermally induced nanoscale dynamics of rapid melting and resolidification of a thin layer of molecular material surrounding a nanoparticle is examined in real time by an all-optical approach. The method employs pulsed periodic modulation of the medium’s dielectric constant through absorption of a low-duty-cycle laser pulse train by a single nanoparticle that acts as a localized heating source. Interpretation of experimental data, including inference of a phase change and of the liquid/solid interface dynamics, is obtained by comparing experimental data with results from coupled optical–thermal numerical simulations. The combined experimental/computational workflow presented in this proof-of-principle study will enable future explorations of material parameters at nanoscale, which are often different from their bulk values and in many cases difficult to infer from macroscopic measurements.