Figure 1
Emergence of linearly-arranged micro w/w droplets inside a glass capillary. (a) Schematic representation of the experimental procedure. After mechanical mixing of PEG and DEX solutions at a final composition of PEG/DEX = 5 wt%:5 wt%, the solution was sucked up into a glass capillary (inner diameter: 140 µm) and then both ends of the capillary were sealed. The glass capillary was placed horizontally on the stage of an optical microscope. (b) Left: Spatiotemporal diagram, Right: Snapshots of the capillary at different times. Time is given as the duration after the start of the microscopic observation, which is ca. 2 min after the timing of mechanical mixing. Dashed lines indicate the inner glass wall. DEX was labeled with fluorescein isocyanate-bound DEX (FITC-DEX, Mw = 250,000). (c) Schematic drawing of the linearly-arranged w/w droplets. The gray area represents the glass wall of the capillary.
