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Soft matter and liquids

Soft matter and liquids

Ion-exchange bead writes under water

09 Oct 2023 Isabelle Dumé
A selection of images drawn in water, including shapes and letters
Water writing: As the bead moves, it trades residual cations in the water for protons, and thus traces out an invisible track of lower pH in the liquid. Linear scales: 250 µm. (Courtesy: ill./©: Thomas Palberg, Benno Liebchen)
Writing requires a substrate, like clay or paper, to fix the written lines and letters in place. Doi

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Isabelle Dumé is a contributing editor to Physics World
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