Fast, Cheap and Colorful 3D Printing
Selective laser sintering (SLS) printers use a laser to heat specific regions of a powdered material, typically nylon or polyamide, so that the powder melts or sinters to form a solid mass. The printer adds then selectively sinters new powdered material layer by layer until the desired 3D structure is obtained. To reduce the energy requirements of the process, researchers have added compounds called photosensitizers to the polymer powders. These materials, such as carbon nanotubes, carbon black and graphene, absorb light much more strongly than the polymers and transfer heat to them, enabling the use of cheaper, lower-power lasers. This brightly colored dragon was produced by 3D printing, using gold nanorods as photosensitizers.
The researchers designed gold nanorods to strongly absorb in the near-infrared region of the spectrum while being almost transparent to visible light. They coated them with silica and then mixed them with polyamide powders to print 3D objects. They found that the gold nanorods were much better at converting light from the laser to heat than carbon black, the industry standard.
The authors acknowledge funding from the European Research Council, Fundació Privada Cellex, the Research Centers of Catalonia (CERCA) and the Severo Ochoa program of the Spanish Ministry of Economy and Business.
The abstract that accompanies this study is available here.
Contacts and sources:
Katie CottinghamThe American Chemical Society
Citation: White and Brightly Colored 3D Printing Based on Resonant Photothermal Sensitizers
Alexander W. Powell , Alexandros Stavrinadis, Ignacio de Miguel, Gerasimos Konstantatos, and Romain Quidant. Nano Letters http://dx.doi.org/10.1021/acs.nanolett.8b01164
Source: http://www.ineffableisland.com/2018/09/fast-cheap-and-colorful-3d-printing.html
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