Two-dimensional Brownian motion of anisotropic dimers,Physical Review E

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Two-dimensional Brownian motion of anisotropic dimers
Physical Review E ( IF 2.2 ) Pub Date : 2021-07-16 , DOI: 10.1103/physreve.104.014605
Daniel B Mayer ₁ , Erick Sarmiento-Gómez _{2,

3} , Manuel A Escobedo-Sánchez ₂ , Juan Pablo Segovia-Gutiérrez ₂ , Christina Kurzthaler ₄ , Stefan U Egelhaaf ₂ , Thomas Franosch ₁

Affiliation

We study the two-dimensional motion of colloidal dimers by single-particle tracking and compare the experimental observations obtained by bright-field microscopy to theoretical predictions for anisotropic diffusion. The comparison is based on the mean-square displacements in the laboratory and particle frame as well as generalizations of the self-intermediate scattering functions, which provide insights into the rotational dynamics of the dimer. The diffusional anisotropy leads to a measurable translational-rotational coupling that becomes most prominent by aligning the coordinate system with the initial orientation of the particles. In particular, we find a splitting of the time-dependent diffusion coefficients parallel and perpendicular to the long axis of the dimer which decays over the orientational relaxation time. Deviations of the self-intermediate scattering functions from pure exponential relaxation are small but can be resolved experimentally. The theoretical predictions and experimental results agree quantitatively.

中文翻译：

各向异性二聚体的二维布朗运动

我们通过单粒子跟踪研究胶体二聚体的二维运动，并将通过明场显微镜获得的实验观察结果与各向异性扩散的理论预测进行比较。比较是基于实验室和粒子框架中的均方位移以及自中介散射函数的推广，这提供了对二聚体旋转动力学的见解。扩散各向异性导致可测量的平移-旋转耦合，通过将坐标系与粒子的初始方向对齐，这种耦合变得最为突出。特别是，我们发现与时间相关的扩散系数平行和垂直于二聚体的长轴的分裂，其在取向弛豫时间内衰减。自中介散射函数与纯指数弛豫的偏差很小，但可以通过实验解决。理论预测和实验结果在数量上一致。

更新日期：2021-07-16

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