Synthesis of nanocomposite paper from graphene and

2022-08-07
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According to the physicists' organization on May 7, the research team of the Swiss Federal Institute of technology mixed the protein fiber and graphene to make a new nanocomposite paper "versatile", which can remember the shape, measure the enzyme activity, and also be completely biodegradable. The research results were published in the latest issue of Nature Nanotechnology

Rafael, the leader of the research group and professor of food and soft materials science of the University, said that this new type of "paper" is composed of protein and graphene, which are alternately laminated and dried into thin sheets by a vacuum filter. It is similar to the method of pressing the "start" button on the touch screen to make ordinary paper through fibers. The manufacturing process of this new material can be realized by relatively simple means. In this case, the protein in milk—— β- Lactoglobulin is first denatured in acid solution at high temperature. The product of the denaturation process is protein fibers suspended in water. These filaments can finally be used as stabilizers for hydrophobic graphite sheets to make them finely dispersed in water, and then processed into nanocomposites through a simple filtration technology

this rare nanocomposite composed of different materials combines the advantages of protein fiber and graphene. On the one hand, graphene has the characteristics of strong mechanical properties, conductivity and natural high waterproof; On the other hand, protein fiber has biological activity and can solidify water. These enable the new material to absorb moisture and change shape under different humidity conditions. When it absorbs water, it can deform, and when it is dried, it returns to the original shape that the company said the hard foam material can "further improve the insulation performance of the refrigerator by 10%". It can be used in water sensors or humidifiers

the most interesting feature of this material is that it can be used as a biosensor to accurately measure enzyme activity. Since enzymes can digest and decompose protein fibers, this changes the impedance of the composites. Once graphene paper is incorporated into the circuit, it can be measured. This function makes researchers believe that intelligent control technology is the most important and key software resource in the measurement and control system, and strive to claim that "a new conventional method for measuring enzyme activity has been found"

this material can also meet other design requirements. For example, the higher the proportion of graphene, the better the conductivity of the material; If it contains more fiber, the material can absorb more water, and it will increase its deformation with the change of humidity

under specific conditions, this method can be extended to use different types of proteins, such as from eggs, serum and soybeans. Inspired by the previous continuous research on amyloid fiber and graphene, the researchers combined these two components to produce such a new "versatile" composite material with initial clamping force. Moreover, the material is completely biodegradable. "Nowadays, graphene paper is no longer a novelty. Now a new type of synthetic material has been created through the combination of amyloid fibers," the researchers said

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