论文标题
胶体板 - 球状混合物的沉积和堆叠序列的颗粒特征的推断
Sedimentation of colloidal plate-sphere mixtures and inference of particle characteristics from stacking sequences
论文作者
论文摘要
从理论上讲，我们通过onsager样密度函数来描述重力的板岩胶体混合物对重力的影响，以描述大量，并结合重力。我们为两组浮力质量和样品高度的不同值计算混合物的堆叠图。由于重力，样品高度和散装相分离之间的复杂相互作用，出现了几个堆叠序列。其中包括实验观察到的浮列序列，该序列由夹在两个各向同性层之间的列层组成。复杂堆叠序列中层厚度的值可用于获取混合物的微观信息。使用浮动列序序列中层的厚度，我们能够从胶体浓度中推断出浮力质量的值，反之亦然。我们还可以预测可以通过实验测试的新现象，例如通过增加样品高度出现在样品的顶部或底部的样品高度，例如堆叠序列的非平凡演化。
We investigate theoretically the effect of gravity on a plate-sphere colloidal mixture by means of an Onsager-like density functional to describe the bulk, and sedimentation path theory to incorporate gravity. We calculate the stacking diagram of the mixture for two sets of buoyant masses and different values of the sample height. Several stacking sequences appear due to the intricate interplay between gravity, the sample height, and bulk phase separation. These include the experimentally observed floating nematic sequence, which consists of a nematic layer sandwiched between two isotropic layers. The values of the thicknesses of the layers in a complex stacking sequence can be used to obtain microscopic information of the mixture. Using the thicknesses of the layers in the floating nematic sequence we are able to infer the values of the buoyant masses from the colloidal concentrations and vice versa. We also predict new phenomena that can be experimentally tested, such as a nontrivial evolution of the stacking sequence by increasing the sample height in which new layers appear either at the top or at the bottom of the sample.
