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首页> 外文期刊>International Journal of Heat and Mass Transfer >Photothermal response of hollow gold nanoshell to laser irradiation: Continuous wave, short and ultrashort pulse
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Photothermal response of hollow gold nanoshell to laser irradiation: Continuous wave, short and ultrashort pulse

机译：中空金纳米壳对激光辐照的光热响应：连续波，短脉冲和超短脉冲

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摘要

This paper is to investigate numerically the photothermal response of the most common size of gold nanoshell (AuNS) in an aqueous medium for biomedical applications. Three types of laser light irradiate the particle; a continuous-wave (CW), short (nanosecond) and ultrashort (femtosecond) pulse laser. The spatiotemporal evolution of the temperature profile inside and around the AuNS is computed using a numerical framework based on the finite element method (FEM). For CW and nanosecond (ns) pulse laser where the AuNS's electrons and lattice are at thermal equilibrium, the ordinary heat diffusion equation is used to describe the heat transfer to the surrounding water. For femtosecond (fs) pulse laser, due to the inexistence of the thermal equilibrium, a two-temperature model (TTM) is used to describe the heat transfer processes occurring in the AuNS and the normal heat diffusion equation is used for the heat flux calculation at the particle/water interface. For each case, the influence of laser intensity on the maximum temperature reached at the particle/water interface is studied. The aim of this study is to provide a description for the fundamentals of heat release of AuNSs and useful insights for the development of these particles for biomedical applications such as drug delivery, photothermal cancer therapy and opto-poration of cells.
机译：本文旨在通过数值研究生物医学应用中水性介质中最常见尺寸的金纳米壳（AuNS）的光热响应。三种类型的激光照射粒子。连续波（CW），短（纳秒）和超短（飞秒）脉冲激光。使用基于有限元方法（FEM）的数值框架计算AuNS内部和周围温度分布的时空演变。对于AuNS的电子和晶格处于热平衡的CW和纳秒（ns）脉冲激光器，可以使用普通的热扩散方程来描述向周围水的热传递。对于飞秒（fs）脉冲激光，由于不存在热平衡，因此使用二温模型（TTM）来描述AuNS中发生的传热过程，并使用正常的热扩散方程式进行热通量计算在粒子/水界面。对于每种情况，研究了激光强度对粒子/水界面处达到的最高温度的影响。这项研究的目的是提供有关AuNSs释放热量的基本原理的描述，以及为开发这些颗粒用于生物医学应用（如药物输送，光热癌症治疗和细胞光穿孔）的有用见识。

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