Evolution of foam structures in Langmuir monolayers of pentadecanoic acid

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Abstract
Measurements are reported of the evolution of foam structures in monolayers of pentadecanoic acid at the air-water interface. The foams are observed by fluorescence microscopy. Various statistical properties of this random two-dimensional cellular structure have been determined: the second moment of the cell-side distribution is constant with time, the characteristic size grows according to a power law with an exponent ≊0.4, Aboav’s law is obeyed, and the average cell perimeter is proportional to the number of sides. Comparisons are made with experiments on soap foams, metal grains, and simulations.