通过单探测器三维动态光散射测量非平衡振荡的绝对速度

IF 8.1 1区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY Physical review letters Pub Date : 2024-11-07 DOI:10.1103/physrevlett.133.198202
José López-Molina, Arturo Moncho-Jordá, María Tirado-Miranda
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引用次数: 0

摘要

单探测器三维动态光散射(3D DLS)是确定失衡胶体粒子漂移速度的可靠技术。特别是,我们的研究发现,当颗粒浸入热诱导对流的介质中时,散射强度的自相关函数中会出现频率明确的振荡。这些振荡是流体对流导致粒子定向运动的结果。针对不同胶体系统获得的实验结果得到了理论模型的证实,并通过流体动力学和布朗动力学模拟进行了全面验证。实验、理论和模拟数据之间的极佳一致性使我们能够对观察到的物理现象做出可靠而全面的解释。这封信采用了先进的动态光散射技术,为非平衡粒子动力学领域提供了见解,不仅适用于受稳态扩散对流影响的胶体悬浮液,也适用于其他非平衡情景,如外部场(如引力场、电场或磁场)驱动的系统。
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Measuring Absolute Velocities from Nonequilibrium Oscillations via Single-Detector 3D Dynamic Light Scattering
Single-detector 3D dynamic light scattering (3D DLS) emerges as a reliable technique to determine the drift velocity of out-of-equilibrium colloidal particles. In particular, our investigation reveals the appearance of oscillations of a well-defined frequency in the autocorrelation function of the scattered intensity when particles are immersed in a medium exposed to thermally induced convection. These oscillations arise as a consequence of the directed motion of particles due to the convection of the fluid. The experimental results obtained for different colloidal systems are corroborated by a theoretical model and thoroughly validated with fluid dynamics and Brownian dynamics simulations. The excellent agreement between experimental, theoretical and simulation data allows us to provide a solid and comprehensive explanation of the observed physical phenomena. This Letter, using an advanced dynamic light scattering technique, offers insights into the field of nonequilibrium particle dynamics, applicable not only to colloidal suspensions affected by steady-state diffusion-convection but also to other nonequilibrium scenarios, such as systems driven by external fields (e.g., gravitational, electric or magnetic fields).
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来源期刊
Physical review letters
Physical review letters 物理-物理:综合
CiteScore
16.50
自引率
7.00%
发文量
2673
审稿时长
2.2 months
期刊介绍: Physical review letters(PRL)covers the full range of applied, fundamental, and interdisciplinary physics research topics: General physics, including statistical and quantum mechanics and quantum information Gravitation, astrophysics, and cosmology Elementary particles and fields Nuclear physics Atomic, molecular, and optical physics Nonlinear dynamics, fluid dynamics, and classical optics Plasma and beam physics Condensed matter and materials physics Polymers, soft matter, biological, climate and interdisciplinary physics, including networks
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