Researchers at Perm National Research Polytechnic University (PNRPU) have patented a method for producing graphene material products that solves the problem of uneven particle distribution in composites. The development opens up prospects for creating ultra-durable building materials, conductive coatings, and protective layers in the aerospace industry.
Graphene, discovered by Russian scientists Andre Geim and Konstantin Novoselov in 2004, has unique properties: it is stronger than diamond, flexible, and has high electrical conductivity. However, its industrial application is limited by the complexity of production. A more affordable alternative is graphene-containing materials — multilayer analogues that are already being tested in composites for construction, electronics, and aviation.
Traditionally, graphene particles and a substance that serves as a binder (e.g., epoxy resin, ceramics, etc.) are used to obtain such composite materials. The main problem in creating such materials is the uneven distribution of graphene particles, which reduces their strength. Scientists at PNRPU have proposed a solution: they used graphene material simultaneously as a binder and filler.
As a result of mixing graphene material with water, we obtained a hydrogel binder necessary for "gluing" particles together. Then we added dry graphene powder to the gel and, after pressing, obtained samples that do not delaminate and gradually break down during testing. Of particular interest to us is the fact that graphene-like material, when simply mixed with water, is itself capable of forming a hydrogel for composites. We have identified a gelation condition in which the ratio of graphene material to liquid should be 1:1.5-2.
The new method may accelerate the introduction of graphene composites into the production of building materials, adsorbents, protective coatings, and parts for the automotive and aviation industries. The research was carried out within the framework of the "Priority-2030" program.
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