3D printing sped up 100 times with tiny blobs of metal

Researchers at Stanford have developed a new material for rapid printing at the nanoscale.With its help, they

are printing tiny gratings that are both strong and lightweight. The development can be used to create lightweight protective coatings for fragile parts of satellites, drones and microelectronics.

To create their material, engineers includedmetal nanoclusters—tiny clumps of atoms—into a printing medium using two-photon lithography. This is a method in which the printed material is hardened by a chemical reaction initiated by laser light. 

The scientists found that their nanoclusters were very good at triggering the desired reactions, and the result was a material that is a composite of polymer print media and metal.

A tiny Stanford logo printed with a new material. Image: John Kulikowski, Stanford

Researchers have managed to combine metalnanoclusters with various materials for 3D printing. Among them are acrylates, epoxy resins and proteins. This means that the new method is suitable for use in a wide variety of areas, the developers say. 

In addition, nanoclusters helped speed up the processprint. For example, by combining nanoclusters with proteins, Gu and her colleagues were able to print at speeds of 100mm per second, about 100 times faster than traditional nanoscale protein printing technologies.

The reaction of the material to the impact. Video: Qi Li et al., Science

Researchers tested their new materialwith several different lattice structures. The study showed that the new material improves the products' ability to absorb energy, increase strength and recoverability - in fact, the ability to compress and spring back.

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