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arXiv 0903.1332cond-mat.soft
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准二维约束下单椭球的扩散

Diffusion of single ellipsoids under quasi-2D confinements

Y. Han, A. Alsayed, M. Nobili, A. G. Yodh

摘要:

我们报告的视频显微镜测量的平移和旋转布朗运动孤立的椭球体颗粒在准二维样品细胞的厚度增加。长时间的扩散系数沿长($D_a$)和短($D_b$)椭圆轴,分别进行了测量,并确定的比例,$D_a/D_b$,作为一个函数的壁约束和颗粒纵横比。在三维中,该比率($D_a/D_b$)不能大于2,但是发现壁限制实质上改变扩散各向异性并且实质上减慢沿着短轴的粒子扩散。

英文摘要:

We report video-microscopy measurements of the translational and rotational Brownian motions of isolated ellipsoidal particles in quasi-two-dimensional sample cells of increasing thickness. The long-time diffusion coefficients were measured along the long ($D_a$) and short ($D_b$) ellipsoid axes, respectively, and the ratio, $D_a/D_b$, was determined as a function of wall confinement and particle aspect ratio. In three-dimensions this ratio ($D_a/D_b$) cannot be larger than two, but wall confinement was found to substantially alter diffusion anisotropy and substantially slow particle diffusion along the short axis.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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