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A new color 3D printing method

09.08.2018

Today, people are exploring how 3D printing can be used in manufacturing, medicine, fashion, and even the food industry. But one of the most efficient forms of 3D printing has a serious flaw: it only prints black and white objects. Researchers from the Institute of Photonic Sciences (Spain) have changed the method of XNUMXD printing with SLS technology so that it is possible to print in all colors of the rainbow.

Selective laser sintering (SLS) 3D printers use a laser to heat a powdered material - usually nylon or polyamide. Under the action of high temperature, the powder particles are sintered - and a single solid mass is formed. The printer adds material layer by layer until the desired XNUMXD structure is achieved. To reduce the energy requirements of the process, the researchers decided to add special compounds to the polymer powders - photosensitizers: carbon nanotubes, carbon black and graphene. These materials absorb light much more strongly than polymers and convert it to heat much faster, allowing the use of cheaper, lower power lasers. However, carbon-based photosensitizers can only produce gray or black printed objects.

Scientists from the Institute of Photonic Sciences (ICFO, The Institute of Photonic Sciences) wanted to find a photosensitizer that would allow printing colored objects using the SLS method.

To do this, the researchers developed gold nanorods that would intensely absorb light in the infrared region of the spectrum, being almost transparent to visible light. They coated microscopic rods with silicon dioxide (colourless crystals that are highly durable) and then mixed them with polyamide powders to print XNUMXD objects. They found that gold nanorods convert laser light into heat much better than carbon black.

In addition, the new photosensitizers help produce purer white objects and - when mixed with dyes - brightly colored three-dimensional objects.

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