Enhanced electromagnetic wave absorption and mechanical performances of graphite nanosheet/PVDF foams via ice dissolution and normal pressure drying

Abstract

Developing lightweight polymer-based composite materials with electromagnetic (EM) wave absorption and mechanical load-bearing properties is urgent for application in complex environments. Herein, low-cost two-dimensional graphite nanosheets (GNS) were utilized as...

Intelligent Tunable Wave-Absorbing CNTs/VO2/ANF Composite Aerogels Based on Temperature-Driving

“…However, increasing electromagnetic wave (EMW) pollution and radiation also cause threats to human health and information security. The urgent demand on how to deal with EMW pollution and absorb EMW radiation efficiently has raised great concerns about the development of efficient EMW absorbing materials. − In recent years, many traditional materials such as carbon-based materials (graphene, carbon nanotubes), conductive polymers (ferrites, alloys), and metal-based materials have been applied to electromagnetic wave absorption (EMA) strategies. , Graphene is a two-dimensional structure composed of a single layer of carbon atoms with excellent high electrical conductivity and mechanical strength but is currently expensive to prepare on a large scale and prone to structural changes at high temperatures, affecting performance . Carbon nanotubes have shown great strengths in electromagnetic wave-absorbing materials due to their excellent electrical and thermal conductivity, light weight, and good stability; however, they are easy to agglomerate, are difficult to disperse in the substrate, and have a large dielectric constant, which is not conducive to impedance matching. − The physical properties of aerogels with ultralow density, high porosity, large specific surface area, and low dielectric constant have great potential for modulating EMA. − …”