Anisotropic dynamics on the colloidal length scale is ubiquitous in nature. Of particular interest is the dynamics of systems approaching a kinetically arrested state. The failure of classical techniques for investigating the dynamics of highly turbid suspensions has contributed toward the limited experimental information available up until now. Exploiting the recent developments in the technique of differential dynamic microscopy (DDM), we report the first experimental study of the anisotropic collective dynamics of colloidal ellipsoids with a magnetic hematite core over a wide concentration range approaching kinetic arrest. In addition, we have investigated the effect of an external magnetic field on the resulting anisotropic collective diffusion. We combine DDM with small-angle x-ray scattering and rheological measurements to locate the glass transition and to relate the collective short- and long-time diffusion coefficients to the structural correlations and the evolution of the zero shear viscosity as the system approaches an arrested state.

中文翻译：

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各向异性动力学和动力学停滞的致密胶体椭球在外部场的存在下，通过差分动态显微镜研究。

胶体长度尺度上的各向异性动力学本质上是普遍存在的。特别令人感兴趣的是系统接近动力学停滞状态的动力学。用于研究高浊度悬浮液动力学的经典技术的失败，导致了迄今为止可获得的有限的实验信息。利用微分动态显微镜（DDM）技术的最新发展，我们报告了具有磁性赤铁矿核的胶体椭球体在宽浓度范围内接近动力学阻滞的各向异性集体动力学的第一项实验研究。另外，我们研究了外部磁场对各向异性各向异性集体扩散的影响。