After the holiday gift wrapping is done, Scotch tape may have a new job as a shape-changing “smart material” that can collect water samples for environmental testing.
While using tape to collect pollen, doctoral student Manuel Ochoa noticed that it curled when exposed to humidity. The cellulose-acetate absorbs water, but the adhesive film repels water.
“So, when one side absorbs water it expands, the other side stays the same, causing it to curl,” says Babak Ziaie, professor of electrical and computer engineering and biomedical engineering at Purdue University.
Full story at Futurity.
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Photo credit: Manuel Ochoa/Purdue University