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Picture of the Day

Self-healing reverse filter opens the door for many novel applications

Researchers have developed a self-healing membrane that acts as a reverse filter, blocking small particles and letting large ones through. This newly developed membrane acts like when someone puts a finger into a glass of water, then the water surface "self-heals" after the finger is taken out. Unlike conventional filters, however, this one does not separate objects by size. Instead, it responds to an object's kinetic, or movement, energy. In addition, the membrane wraps around the object as it passes through, allowing the membrane to completely self-heal over the top of the object passing through it. Shown here: An optical image showing the reflection of light off of a self-healing, free-standing liquid membrane. Such a membrane is capable of performing unusual particle separation.

Visit Website | Image credit: Birgitt Boschitsch Stogin/Penn State