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This research found that when an acidic solution with a low surface tensionspread on the surface of a glycerol solution mixed with milk, a star shapedpattern was spontaneously formed on the surface in the horizontal plane duringthe spreading process. We investigated the emergence of the star shaped patternowing to an interfacial instability in experiments using glycerol solutionswith several viscosities and 2-methoxyethanol aqueous solutions, which areacidic solutions, with several concentrations. This result demonstrated thatthe star shaped pattern emerged in the high concentration of 2-methoxyethanol.We proposed a phenomenological model, based on our experimental results, whichexplains three points as follows; the spreading of the 2-methoxyethanol aqueoussolution on the surface of the glycerol solution, the colloidal aggregation ofthe milk protein colloids caused by the denaturation that occurs when mixedwith 2-methoxyethanol, and the accumulation of the aggregates toward the dentregions of the moving interface by a sweeping effect. The model reproduces theformation of the star shaped pattern which was similar to the experimental one.Furthermore, the model provided a phase diagram against the concentration ofthe 2-methoxyethanol solution and the viscosity of the glycerol solution ascontrol parameters in our experiments. The phase diagram was close to thatobtained from our experiments. The results suggest that the above three pointsare important for the formation of the star shaped pattern.

Star shaped patterns caused by colloidal aggregation during the spreading process of a droplet