The reporter learned from the University of Science and Technology of China that the academician Yu Shuhong ’s research team cooperated with Professor Liang Haiwei ’s research group to thermally convert structural biomaterials into graphite carbon nanofiber aerogels through pyrolysis chemical control, which perfectly inherited bacterial cellulose The hierarchical structure from macro to micro has remarkable thermo-mechanical properties and realizes large-scale synthesis. Related results were published in "Advanced Materials".
Lightweight compressible material with super elasticity and fatigue resistance, is an ideal material for aerospace, mechanical buffering, energy damping and soft robots. Many low-density polymer foams are highly compressible, tend to fatigue when reused, and undergo superelastic degradation near the polymer's glass transition and melting temperature. Although carbon nanotubes and graphene have inherent super-elasticity and thermo-mechanical stability, the complicated equipment and preparation process involved make it only possible to prepare materials with a millimeter size. On the other hand, complex hierarchical biomaterials that have evolved from hundreds of millions of years in nature have received much attention because of their excellent mechanical properties. However, because they are pure organic or organic / inorganic composite structures, they are usually only suitable for Work within a narrow temperature range. Therefore, converting these non-thermally stable structural biological materials into thermally stable graphite materials with inherent hierarchical structure is expected to create thermodynamically stable materials.
The team developed a method for chemically regulating the pyrolysis of bacterial cellulose using inorganic salts, and realized a large-scale synthesis and morphology-preserving new carbonization process. The developed carbon nanofiber aerogel inherited the bacterial cellulose from The macro to micro hierarchical structure shows obvious superelasticity and fatigue resistance without changing temperature in a wide temperature range. Since carbon nanofiber aerogels have excellent thermally stable mechanical properties and can be prepared in large quantities, they will have important application prospects in many fields, especially suitable for mechanical buffering, pressure sensing, energy damping and aerospace solar energy under extreme conditions Batteries, etc. (Reporter Wu Changfeng)
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