A surprising experiment opens the path to new particle manipulation methods

ScienceDaily | 5/10/2019 | Staff
hoppers911 (Posted by) Level 4
The experiment was first performed in from 1787 by Ernst Chladni, who is now known as the father of acoustics. Chladni's experiment showed that when a plate is vibrating at a frequency, heavy particles move towards the regions with less vibration, called nodal lines. This experiment has been extensively repeated during the centuries since, and shaped the common understanding of how heavy particles move on a vibrating plate. But researchers at Aalto University have now shown a case where heavy particles move towards the regions with more vibrations, or antinodes. "This is a surprising result, almost a contradiction to common beliefs," says Professor Quan Zhou.

The researchers installed a silicon plate on a piezoelectric transducer and submerged it into water. They spread sub-mm glass spheres on the plate, and vibrated the plate with signals of different frequencies, creating waves on the plate. The researchers were then surprised to observe that the particles move towards the antinodes, forming what they...
(Excerpt) Read more at: ScienceDaily
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