| Aug 01, 2024 |
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(Nanowerk Information) A brand new 3D printing methodology developed by engineers on the College of California San Diego is so easy that it makes use of a polymer ink and salt water resolution to create stable buildings. The work, printed in Nature Communications (“Sustainable 3D printing by reversible salting-out results with aqueous salt options”), has the potential to make supplies manufacturing extra sustainable and environmentally pleasant. |
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The method makes use of a liquid polymer resolution generally known as poly(N-isopropylacrylamide), or PNIPAM for brief. When this PNIPAM ink is extruded by way of a needle right into a calcium chloride salt resolution, it immediately solidifies because it makes contact with the salt water. Researchers used this course of to print stable buildings with ease. |
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This speedy solidification is pushed by a phenomenon referred to as the salting-out impact, the place the salt ions draw water molecules out of the polymer resolution as a consequence of their sturdy attraction to water. This elimination of water causes the hydrophobic polymer chains within the PNIPAM ink to densely combination, making a stable type. |
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“That is all accomplished underneath ambient situations, without having for added steps, specialised gear, poisonous chemical substances, warmth or strain,” mentioned examine senior writer Jinhye Bae, a professor within the Aiiso Yufeng Li Household Division of Chemical and Nano Engineering on the UC San Diego Jacobs Faculty of Engineering. |
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Conventional strategies for solidifying polymers sometimes require energy-intensive steps and harsh substances. In distinction, this new course of harnesses the easy interplay between PNIPAM and salt water at room temperature to realize the identical consequence, however with out the environmental price. |
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Plus, this course of is reversible. The stable buildings produced may be simply dissolved in recent water, reverting to their liquid type. This permits the PNIPAM ink to be reused for additional printing. “This affords a easy and environmentally pleasant strategy to recycle polymer supplies,” mentioned Bae. |
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To show the flexibility of their methodology, the researchers printed buildings out of PNIPAM inks containing different supplies. For instance, they printed {an electrical} circuit utilizing an ink made from PNIPAM combined with carbon nanotubes, which efficiently powered a light-weight bulb. This printed circuit may be dissolved in recent water, showcasing the potential for creating water-soluble and recyclable digital parts. |
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Bae and her staff envision that this straightforward and reversible 3D printing approach may contribute to the event of environmentally pleasant polymer manufacturing applied sciences. |
