"Experimental study of forces between quasi-two-dimensional emulsion droplets near jamming
KW Desmond, PJ Young, D Chen, and ER Weeks, Soft Matter 9, 3424-3436 (2013).

We experimentally study the jamming of quasi-two-dimensional emulsions. Our experiments consist of oil-in-water emulsion droplets confined between two parallel plates. From the droplet outlines, we can determine the forces between every droplet pair to within 8% over a wide range of area fractions. Using the data, we observe critical scaling behaviors of the contact numbers and pressure as the jamming transition is approached from above. We further characterize the force chains observed in the experiment, finding that they are spatially uncorrelated for all area fractions.