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Polymers

Polymers

Shear forces help make stretchable hydrogel

08 Apr 2019 Isabelle Dumé
The gelation mechanism
Left: The gelation mechanism through metal coordination to the pseudopolyrotaxanes; the metal ions are shown as yellow spheres. In the lower panel, which represents the hydrogel, the pseudorotaxanes are shown as blue lines. Right: Stimuli-responsive properties of the Cu(II)-based hydrogel, showing that the gel reverts to a sol overnight, and can be converted into a gel again under shear force. Courtesy: W Jiang, Southern University of Science and Technology in China
Shear forces can convert a sol into a gel. This surprising new behaviour, observed in an aqueous sol

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Isabelle Dumé is a contributing editor to Physics World
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