We have probably all seen the triboelectric series table of different materials. When different materials are brought into contact and separated, one acquires a negative charge and the other a positive charge. The materials are sorted in a triboelectric table sorted from positive to negative. But nobody really understands the underlying mechanism, and the table order is not always consistent.
Scientists in Austria have uncovered another factor that might explain what is going on.
"Physicists in Austria have shown that the static electricity acquired by identical material samples can evolve differently over time, based on each samples’ history of contact with other samples. Led by Juan Carlos Sobarzo and Scott Waitukaitis at the Institute of Science and Technology Austria, the team hope that their experimental results could provide new insights into one of the oldest mysteries in physics."
more...
https://physicsworld.com/a/memory-of-previous-contacts-affects-static-electricity-on-materials/
https://en.wikipedia.org/wiki/Triboelectric_effect
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