3D printed nanomaterials punch above weight

Described in the German Chemical Society’s Angewandte Chemie, the technique involves 3D printing gels made from mechanically interlocked molecules (MIMs) - a type of nanomachine composed of rings on a molecular axle. Nobel Prize-winning research has previously shown how MIMs can be induced into nanoscale work using various stimuli. However, imposing order on the MIMs and achieving work on a scale visible to the naked eye had not previously been possible.

“Up until now, harnessing the mechanical work of nanomachines has been extremely difficult,” said lead researcher Chenfeng Ke, assistant professor for chemistry at Dartmouth College. “We are slowly getting closer to the point that the tiny machines can operate on a scale that we can see, touch and feel.”

The team started by synthesising MIM-based hydrogels suitable for 3D printing. Lattice-like structures with cross-linked axles were printed, providing mechanical stability and structural strength. Using a solvent, the researchers were able to exert control over the molecular nanorings at the heart of the structures, changing their overall shape.