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Double bubble comes off in a pinch

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12:44pm, April 20, 2005

Scientists at Harvard University have nestled droplets inside droplets by squeezing three concentrically arranged streams of fluids into a glass tube. The double droplets could be useful for encapsulating food additives and components of cosmetics. The innermost (1) and outermost (3) fluids shown here are silicon oil, and the middle fluid (2) is a water-glycerol mixture. The two inner fluids, flowing right to left, pinch off (at arrow) to form uniform, two-layer microscopic droplets within the outermost oil.

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