HC Plastics News: The above picture is a new type of lightweight, high-strength, flame-retardant and highly elastic metamaterials. These excellent properties make it a potential application in various fields.
Researchers from Purdue University, in collaboration with scientists at Lanzhou University and Harbin Institute of Technology, and scientists at the US Air Force Research Laboratory, believe that metamaterials that combine alumina nanolayers and graphene can be applied. A variety of industries including construction and aerospace.
Gary Cheng, an associate professor at Purdue University's School of Industrial Engineering, said in a statement: "This material is even lighter than feathers because it has a very low density and a very high specific strength."
Gary Cheng added: "The superior performance of ceramic components has been used in many fields today, such as insulation materials, smart sensors, electromagnetic wave absorbing materials and anti-corrosion coatings."
This metamaterial has a honeycomb microstructure inside, which provides superior elasticity and structural robustness (structural robustness, also known as structural integrity and robustness, can sometimes be referred to as preventing continuous collapse of the structure. It is From the perspective of structural concept, the interpretation of the overall mechanical performance of the structure requires that the structural components can work in harmony, the connection should be reliable, and constitute a solid structural whole; the structural robustness requires that the structure has multiple lines of defense, not due to certain The failure of a component causes structural damage, requiring that the structure does not cause a wide range of continuous collapses even after local damage. The composite material consists of graphene sandwiched between ceramic layers. Graphene scaffolds, also known as aerogels, are chemically bonded to a ceramic layer by a process called atomic layer deposition.
GaryCheng said: "We carefully controlled the geometry of this graphene aerogel and deposited a very thin ceramic layer. It is worth mentioning that the mechanical properties of this aerogel are versatile," He added, "This study has the potential to make graphene a more practical functional material."
Generally, graphene is automatically decomposed at high temperatures, but ceramic alumina gives it high heat resistance and flame retardancy, and can be used as a heat shield for aircraft. However, ceramic materials also have some bad effects, inhibiting their use as functional materials.
GaryCheng said: "Here we report a versatile ceramic - graphene metamaterial, the microstructure of which provides superior flexibility and structural robustness. To achieve this, we combine multiple layers of elasticity. The cell, designed a layered honeycomb microstructure. This metamaterial simultaneously exhibits a series of versatile properties that have not been reported in previous ceramic and ceramic-matrix composite structures," he Added.
This lightweight, high-strength and highly shock-absorbing material promises to make composites a good substrate for flexible electronics and large strain sensors. It also has a high electrical conductivity and is an excellent thermal insulation material for use as a flame retardant, thermal barrier coating and as a sensor and device for converting heat into electrical energy.
The process may be applied to large-scale industrial manufacturing, and in the future it may be possible to optimize the properties of the material by changing its crystal structure or by expanding the process of manufacturing and controlling the microstructure. 
Editor in charge: Wang Ning 12
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