Shape-changing three-dimensional structures have been created by researchers from MIT using 4D printing.
The structures may be used in a range of applications from medical implants to home appliances. Lead study author Dan Raviv, a mathematician at Massachusetts Institute of Technology, and colleagues are working on 4D printing and the experiment involves 3D printing items that would change shape after getting printed.
Two materials were used by the researchers to print 3D structures. Both materials were having different properties. One material was a stiff plastic, and stayed rigid, while the other was water absorbent, and could double in volume when submerged in water.
The formula of this water-absorbent material has been developed by 3D-printing company Stratasys in Eden Prairie, Minnesota. The company, however, preferred to keep the formula secret. A square grid, measuring about 15 inches (38 centimetres) on each side was printed by the researchers.
When the grid was put in water by the researchers the water-absorbent material acted like joints that stretch and fold, producing a broad range of shapes with complex geometries.
The 3D-printed shape created by the researchers resembled the initials "MIT" that could transform into another shape resembling the initials "SAL." "In the future, we imagine a wide range of applications," Raviv said.
Raviv added that the technique could be used in appliances that can adapt to heat and improve functionality or comfort, childcare products that can react to humidity or temperature.
via Science - Google News http://ift.tt/1zW1fTj
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