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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Thermophoretic Random Walks and Enhancement of Diffusion
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Thermophoretic Random Walks and Enhancement of Diffusion

机译：热渗透随机行走和增强扩散

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摘要

The contribution of the stochastic thermodiffusion to the diffusion enhancement is studied. The thermodiffusion of particles suspended in a liquid may hold place when the spontaneous endo- or exothermal nanoscale events similar to elementary acts of enzymatic reactions occur as the random series in the space and time. In these events, the energy can be emitted or absorbed at nanoscale during few to hundreds of picoseconds. It may cause local spontaneous temperature spikes spreading quickly in the space and decaying with time. The random local temperature spikes create local transient temperature gradients, where thermodiffusion of the molecules and particles holds place as well as the change in the physical properties of the suspending medium due to heating. These thermodiffusion random walks may appear as the enhanced usual Stokes-Einstein diffusion when the energy absorption/generation is high enough. The evaluated relative contribution of the mentioned effect to the molecular mobility is shown to be in agreement with experimental data on enzymatic reactions from the literature.
机译：研究了随机热扩散对扩散增强的贡献。当类似于酶促反应基本行为的自发内热或放热纳米级事件在空间和时间上以随机序列的形式发生时，悬浮在液体中的颗粒的热扩散可能会发生。在这些事件中，能量可以在几到几百皮秒的时间内以纳米级发射或吸收。它可能会导致局部自发温度峰值在空间中迅速传播，并随时间衰减。随机的局部温度峰值产生局部瞬态温度梯度，分子和颗粒的热扩散以及悬浮介质的物理性质因加热而发生变化。当能量吸收/产生足够高时，这些热扩散随机游动可能表现为增强的通常斯托克斯-爱因斯坦扩散。所评估的上述效应对分子迁移率的相对贡献与文献中有关酶反应的实验数据一致。

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