In the wake of recent off-shore oil spills, and with the growing popularity of "fracking" — in which water is used to release oil and gas from shale — there's a need for easy, quick ways to separate oil and water. Now, scientists have developed coatings that can do just that. Their report on the materials, which also could stop surfaces from getting foggy and dirty, appears in ACS Applied Materials & Interfaces.
J.P.S. Badyal and colleagues point out that oil-spill cleanup crews often use absorbents, like clays, straw and wool to sop up oil, but these materials aren't very efficient because they also sop up a lot of water. Extra steps and equipment also are needed to remove the oil from the absorbent, which is difficult to do on a ship. Recently, researchers have turned their attention to new smart materials called "oleophobic-hydrophilic" coatings that instead let the water through and repel the oil. However, the films that have been reported so far take several minutes to do the separation, are complicated to make or aren't very good at repelling oil. So, Badyal's team set out to improve these materials.
They developed oleophobic-hydrophilic coatings that they applied to pieces of metal mesh, just like what's used in screen doors. When they poured an oil-water mixture onto it, the water dripped through into the container below, while the oil remained perched atop the mesh surface. Then, they simply tilted the mesh so the oil went into another container. The separation was instantaneous and more efficient than existing films, and it only took one step to make the coating. The team also demonstrated that it could serve as an anti-fogging and self-cleaning film.