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. 2012 Jun 1;109(25):9839-9844. doi: 10.1073/pnas.1201499109

Fig. 1.

Fig. 1.

(A) Schematic representation of functionalized emulsions. The oil–water interface is stabilized by a mixture of phospholipids and negatively charged SDS. Some of the lipids hold a PEG-biotin group that allows binding through biotin-streptavidin interactions, as shown on the upper droplets. (B) Three-dimensional representation of confocal images shows Texas red-streptavidin fluorescence on the surface of the droplets. Packing under gravity is not sufficient to create adhesion between the droplets (top image), whereas an applied pressure triggers the formation of adhesions between the droplets, shown as the areas of brighter fluorescence in the bottom image.