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'4D Printing' with Shape-Shifting Smart Gel
Rutgers University engineers have developed a "4D printing" method for a smart hydrogel that could lead to the development of "living" structures in human organs, soft robots, and drug delivery. The approach involves printing a 3D object with a hydrogel that changes shape over time, when temperatures change.

Rutgers University engineer Howon Lee spoke with Tech Briefs about the manufacturing possibilities.
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