In this video, the researchers add a droplet of water to canola oil and slowly increase its size. It floats on the surface until it gets too big, when gravity overcomes the forces involved and it sinks.
This demo shows that although water is denser than oil, and should typically sink, the size of the droplet also plays a role. In this case, if a water droplet is small enough, the surface tension of the canola oil is able to support it. However, experiments showed that tiny drops didn't float on all oils. So far, four types of vegetable oils were able to hold up the droplets, while the maximum size supported varied for each one.?
According to Phan, the floating ability of water could be harnessed to clean up oil spills. Oil-eating microbes often deployed to breakdown oil, such as during the recent Deepwater Horizon in the Gulf of Mexico, could be released within water droplets on the surface, along with nutrients. "The limiting factor is not microorganisms; we can't deliver nutrients to the microbes in high concentrations," says Phan. "Using droplets, we could deploy both microbes and enough nutrients on the oil surface which would speed up the biodegradation process."
If you enjoyed this video, check out a remote control soap that mixes oil and water on demand or watch a coating that repels both oil and water.
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