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Shrinky Dinks Build Chips on the Cheap

Shrinky Dinks Used to Build Chips on the Cheap
Do you remember Shrinky Dinks? That's okay. Neither do most of the Switched staffers -- the bunch of whippersnappers they are [Ed Note: Not true. We love them.]. The once-popular, plastic arts-and-craft set, which first hit the scene in 1973, allowed children to color and cut out shapes on a thin sheet of plastic. When the shapes were put in the oven, they would shrink to one-third of their original width, becoming thick and rigid. Well, it turns out that making tacky charms is just scratching the surface of this toy's potential.

Back in 2006, University of California at Irvine assistant professor Michelle Khine couldn't afford to outfit her lab with the $100,000 worth of equipment needed to create microfluidic chips. Frustrated and impatient, she turned to an updated version of Shrinky Dinks -- one that lets you run the aforementioned plastic sheets through a standard inkjet or laser printer. Needing the chips to create medical diagnostic tests, she took a shot in the dark by printing her chip designs on Shrinky Dinks, and then baking them. When the sheets shrunk, the ink clumped together and formed tiny ridges. She then used the minis as molds for the circuits she made out of a flexible polymer called PDMS.

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