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首页> 外文期刊>The European physical journal, E. Soft matter >Static versus dynamic analysis of the influence of gravity on concentration non-equilibrium fluctuations
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Static versus dynamic analysis of the influence of gravity on concentration non-equilibrium fluctuations

机译：重力对浓度非平衡波动影响的静态和动态分析

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摘要

In a binary fluid mixture subject to gravity and a stabilizing concentration gradient, concentration non-equilibrium fluctuations are long-ranged. While the gradient leads to an enhancement of the respective equilibrium fluctuations, the effect of gravity is a damping of fluctuations larger than a "characteristic" size. This damping is visible both in the fluctuation power spectrum probed by static and the temporal correlation function probed by dynamic light scattering. One aspect of the "characteristic" size can be appreciated by the dynamic analysis; in fact at the corresponding "characteristic" wave vector q* one can observe a maximum of the fluctuation time constant indicating the more persistent fluctuation of the system. Also in the static analysis a "characteristic" size can be extracted from the crossover wave vector. According to common theoretical concepts, the result should be the same in both cases. In the present work we provide evidence for a systematic difference in the experimentally observed "characteristic" size as obtained by static and dynamic measurements. Our observation thus points out the need for a more refined theory of non-equilibrium concentration fluctuations.
机译：在重力和稳定浓度梯度作用下的二元流体混合物中，浓度非平衡波动是长期的。虽然梯度导致各个平衡波动的增加，但是重力的影响是大于“特征”尺寸的波动的阻尼。在通过静态探测的波动功率谱和通过动态光散射探测的时间相关函数中，这种阻尼都是可见的。动态分析可以理解“特征”大小的一方面。实际上，在相应的“特征”波矢量q *处，可以观察到最大的波动时间常数，这表明系统的波动更加持久。同样在静态分析中，可以从交叉波矢量中提取“特征”大小。根据常见的理论概念，两种情况下的结果应相同。在当前的工作中，我们提供了通过静态和动态测量获得的实验观察到的“特征”大小的系统差异的证据。因此，我们的观察结果表明，需要一种更加精细的非平衡浓度波动理论。

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