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Fracture resistant and stretchable, biomimetic protein creates two-dimensional layered composites

Science and technology daily, Beijing, July 25 – according to the latest issue of proceedings of the National Academy of Sciences, researchers at Pennsylvania State University in the United States have created a composite layered two-dimensional material using biomimetic proteins on squid ring teeth, which has fracture resistance and strong elasticity.

Nature has created layered materials such as bones and shells. It is this multi-level structure that ensures that bones have high fracture resistance and can support huge bodies. There are countless voids in the bone. However, as it grows, its sensitivity to defects will decrease. This means that even if the bone has many”defects”, it still has high strength.

Merrick demirell and Dorothy falhack, director of the center for advanced fiber technology at Pennsylvania State University and chairman of Lloyd and Dorothy falhack bionic materials, said:”researchers rarely report this interface property of bones and shells because it is difficult to measure through experiments.”

Inspired by this, the newly developed composite two-dimensional materials are composed of hard materials with atomic thickness such as graphene or mxene (usually transition metal carbides, nitrides or carbonitrides), which are bonded and separated by a layer of things. Although bulk graphene or mxene has block properties, the strength of two-dimensional composites comes from the interface properties.

Demirell said that they use an interface material that can be modified through repeated sequences, so as to fine tune its properties and make it flexible and powerful. In addition, this material also has unique heat conduction properties.

“This material is very suitable for making insoles for running shoes.” Demirell said,”it can cool the foot, and repeated bending will not damage the insole.” These two-dimensional composites can also be used in flexible circuit boards, wearable devices and other devices that require strength and flexibility.

According to demirell, the traditional continuum theory cannot explain why these materials are both strong and flexible, but the simulation shows that the interface is very important. When the proportion of materials constituting the interface is high, when the material is under pressure, the interface will fracture locally, but the material as a whole will not fracture.

[editor in chief circle]

Search for”squid ring teeth”, and you will find that researchers have already rubbed their hands on it, carried out a number of studies, and tried to apply it in different fields. Squid ring tooth protein can be processed into fibers and films, which can replace plastic products, improve the wear resistance of fabrics, and make wearable devices… Of course, to apply this bionic material on a large scale, we need to first produce bionic proteins. After all, we can’t just grasp squid and pull proteins. In this paper, researchers use biomimetic proteins to make composite layered materials, which can make it strong and flexible. From the magical creatures of nature, human beings have obtained many”plug-ins” to serve themselves after transformation.