In the summer, many people enjoy walks along the beach looking for seashells. Among the most prized are those that contain iridescent mother of pearl (also known as nacre) inside. But many beachcombers would be surprised to learn that shimmery nacre is one of nature’s strongest, most resilient materials.
Our group has made a material with interlocked mineral layers that resembles nacre and is stronger and tougher than previous mimics.
Some mollusks, such as abalone and pearl oysters, have shells lined with nacre. This material consists of layers of microscopic mineral “bricks” called aragonite stacked upon alternating layers of soft organic compounds.
Scientists have tried to replicate this structure to make materials for engineering or medical applications, but so far artificial nacre has not been as strong as its natural counterpart. Nacre mimics use flat mineral bricks, whereas the natural material has wavy bricks that interlock in intricate herringbone patterns. We focused on reproducing this structure would create a stronger, tougher nacre mimic for sustainable medical materials.
Using the components of natural nacre, we made their composite material by forming wavy sheets of the mineral aragonite on a patterned chitosan film. Then, we interlocked two of the sheets together, filling the space between the wavy surfaces with silk fibroin. They stacked 150 interlocked layers together to form a composite that was about the thickness of a coin. This resembled a mineralized version of Shrilk.
The material was almost twice as strong and four times as tough as previous nacre mimics — close to the strength and toughness reported for natural nacre. The artificial nacre was also biocompatible, which the researchers demonstrated by culturing human embryonic stem cells on its surface for one week. These features suggest that the material could be suitable for sustainable, low-cost medical uses, the researchers say.
Tough and Strong: Cross-Lamella Design Imparts Multifunctionality to Biomimetic Nacre, ACS Nano, (DOI: 10.1021/acsnano.0c01511)