Engineers at the University of California, San Diego have developed an innovative 3D printing method that utilizes a polymer ink and a salt water solution to create solid structures, offering a more sustainable and environmentally friendly approach to materials manufacturing. Published in Nature Communications, this breakthrough process simplifies 3D printing and reduces its environmental impact.
The method employs a liquid polymer solution known as poly(N-isopropylacrylamide), or PNIPAM. When extruded through a needle into a calcium chloride salt solution, the PNIPAM ink instantly solidifies upon contact. This rapid solidification is driven by the salting-out effect, where salt ions attract water molecules from the polymer solution. This attraction causes the hydrophobic polymer chains in the PNIPAM ink to aggregate densely, forming a solid structure.
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