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Superhydrophobic knife cuts water droplet

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At Arizona State University in the United States, Ryan Yanashima from Department of Chemistry & Biochemistry, attempted to cut a water droplet in half sitting on a hydrophobic Teflon surface, with the help of superhydrophobic knife.
Source: Ryan Yanashima et. al.
Sounds impossible, but for doing that, you don’t need any magical knife. A simple water hating knife can do it for you.
Yanashima and his team filmed this amazing moment as a part of their work. Their research work was to find out the more efficient methods of cutting down and separating proteins from the biological fluids, allowing the proteins to be analyzed faster and more efficiently.
For trying different cutting methods, they made a number of specialized knives with polyethylene, zinc and copper. Then, they dipped the surfaces into a silver nitrate solution and a
superhydrophobic solution called HDFT for the time of 20 seconds, and once they fully
washed and properly air-dried, they were super-great at repelling water.
When they lowered a knife into a water drop, it was split in two, each half attached to a loop of wire (see video below)

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They clarify the purpose of their research in a PLoS One:

“A particular focus is using the unique surfaces to enable the
manipulation of individual drops, so that a complex mixture can be
rapidly and inexpensively resolved into individual components.
… Multi-protein separation is vital for the detection of important
proteins that provide valuable information on gene expression, and can
serve as early signals of a disease state.”

Source: ScienceAlert

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