体相分离是导致胶体混合物在沉降过程中出现不同层堆叠的原因。最近提出的理论（de las Heras and Schmidt 2013软物质9 8636）建立了体相行为和沉积-扩散-平衡之间的独特联系。该理论构建了一个堆叠图的所有可能的序列堆栈重力下的限制非常高（无限）的样品高度。在这里，我们研究了有限样品高度h下胶体混合物的堆积图。我们证明了h在胶体混合物的沉积扩散平衡中起着至关重要的作用。在堆积图中，给定的堆积序列所占据的区域取决于h。因此，具有不同高度但相同胶体浓度的两个样品可以形成不同的堆积序列。此外，不同高度的堆积图可以是定性不同的，因为一些堆积序列仅发生在样品高度的给定间隔中。我们使用的理论来研究堆积图的模型散装系统和混合物的补丁颗粒的数量或类型的补丁不同。
英文摘要：
Bulk phase separation is responsible for the occurrence of stacks of different layers in sedimentation of colloidal mixtures. A recently proposed theory (de las Heras and Schmidt 2013 Soft Matter 9 8636) establishes a unique connection between the bulk phase behaviour and sedimentation-diffusion-equilibrium. The theory constructs a stacking diagram of all possible sequences of stacks under gravity in the limit of very high (infinite) sample heights. Here, we study the stacking diagrams of colloidal mixtures at finite sample height, h. We demonstrate that h plays a vital role in sedimentation-diffusion-equilibrium of colloidal mixtures. The region of the stacking diagram occupied by a given sequence of stacks depends on h. Hence, two samples with different heights but identical colloidal concentrations can develop different stacking sequences. In addition, the stacking diagrams for different heights can be qualitatively different since some stacking sequences occur only in a given interval of sample heights. We use the theory to investigate the stacking diagrams of both model bulk systems and mixtures of patchy particles that differ either by the number or by the types of patches.
Sedimentation profiles and phase stacking diagrams in polydisperse hard rounded rectangle fluids
German Aerospace Center (DLR)（德国航空航天中心）；Universität Bayreuth（拜罗伊特大学）；Institut für Theoretische Physik, Universität Tübingen（蒂宾根大学理论物理研究所）；Universidad Autónoma de Madrid（马德里自治大学）；Universidad Carlos III de Madrid（卡洛斯三世马德里大学）
Interplay between elastic fields due to gravity and a partial dislocation for a hard-sphere crystal coherently grown under gravity: driving force for defect disappearance
