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首页> 外文期刊>Philosophical Magazine Letters >Diffusion dynamics of laser-ablated noble-metal nanoparticles in liquids
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Diffusion dynamics of laser-ablated noble-metal nanoparticles in liquids

机译：激光烧蚀贵金属纳米粒子在液体中的扩散动力学

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The diffusion dynamics in water of Brownian particles constituted by noble-metal nanoclusters has been treated by a transport model across a limiting surface that separates two layers of the same fluid, having different values of density and temperature. This model, developed by Parrondo and adapted by Streater, has recently been shown to be useful in several situations like ours by the work of Grillo et al. By this approach, which introduces a one-dimensional vertical adiabatic potential produced by density gradients governing the net current of particles across the limiting surface, we are able to explain the mass and thermal energy transport, which rapidly restores the equilibrium conditions when they are perturbed by laser ablation of a noble-metal target vertically submerged in water. Experimentally, the laser ablation of noble-metal targets has been performed by irradiating pure metal sheets submerged in water with a pulsed Nd:YAG laser at 500 mJcm~(-2) fluency for 5 min and pulses of duration on the nanosecond timescale.
机译：由贵金属纳米团簇构成的布朗粒子在水中的扩散动力学已经通过跨过限制表面的传输模型进行了处理，该限制表面将同一流体的两层分开，密度和温度的值不同。这个模型是由Parrondo开发并由Streater改编的，最近被Grillo等人的工作证明在某些情况下是有用的。通过这种方法，该方法引入了一维垂直绝热势，该绝热势是由控制梯度穿过限制表面的净电流的密度梯度产生的，我们能够解释质量和热能传输，当它们受到扰动时，它们可以快速恢复平衡条件。激光烧蚀垂直浸没在水中的贵金属靶。在实验上，通过用脉冲Nd：YAG激光以500 mJcm〜（-2）的流利度对浸没在水中的纯金属板进行5分钟和持续时间在纳秒级的脉冲照射来进行贵金属靶的激光烧蚀。

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