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Bulk phase separation is responsible for the occurrence of stacks ofdifferent layers in sedimentation of colloidal mixtures. A recently proposedtheory (de las Heras and Schmidt 2013 Soft Matter 9 8636) establishes a uniqueconnection between the bulk phase behaviour andsedimentation-diffusion-equilibrium. The theory constructs a stacking diagramof all possible sequences of stacks under gravity in the limit of very high(infinite) sample heights. Here, we study the stacking diagrams of colloidalmixtures at finite sample height, h. We demonstrate that h plays a vital rolein sedimentation-diffusion-equilibrium of colloidal mixtures. The region of thestacking diagram occupied by a given sequence of stacks depends on h. Hence,two samples with different heights but identical colloidal concentrations candevelop different stacking sequences. In addition, the stacking diagrams fordifferent heights can be qualitatively different since some stacking sequencesoccur only in a given interval of sample heights. We use the theory toinvestigate the stacking diagrams of both model bulk systems and mixtures ofpatchy particles that differ either by the number or by the types of patches.

The role of sample height in the stacking diagram of colloidal mixtures under gravity