“These types of materials have the potential to be most useful in medical products, in food products as a thickening agent, or in soft robotics,” said Austin Williams

3D-printable gels with improved and highly controlled properties can be created by merging micro- and nano-sized networks of the same materials harnessed from seaweed, according to new research from North Carolina State University.

The findings could have applications in biomedical materials – think of biological scaffolds for growing cells – and soft robotics.

The findings show that these water-based gels – called homocomposite hydrogels – are both strong and flexible. They are composed of alginates – chemical compounds found in seaweed and algae that are commonly used as thickening agents and in wound dressings.

Orlin Velev, S. Frank and Doris Culberson Distinguished Professor of Chemical and Biomolecular Engineering at NC State explains:

“Water-based materials can be soft and brittle. But these homocomposite materials – soft fibrillar alginate particles inside a medium of alginate – are really two hydrogels in one: one is a particle hydrogel and one is a molecular hydrogel.

“Merged together they produce a jelly-like material that is better than the sum of its parts, and whose properties can be tuned precisely for shaping through a 3D printer for on-demand manufacturing.”

Future work will attempt to fine-tune this method of merging of homocomposite materials to advance 3D printing for biomedical applications or biomedical injection materials.

Lilian Hsiao, an assistant professor of chemical and molecular engineering at NC State added:

“We are reinforcing a hydrogel material with the same material, which is remarkable because it uses just one material to improve the overall mechanical properties.

“Alginates are used in wound dressings, so this material potentially could be used as a strengthened 3D-printed bandage or as a patch for wound healing or drug delivery.”

The research has been published in the journal Nature Communications.

Related article:

Opening “the door for new applications of 3D printing”