High Mechanical Property of Laminated Electromechanical Sensors by Carbonized Nanolignocellulose/Graphene Composites

Abstract

Although widely used in nanocomposites, the effect of embedding graphene in carbonized nanolignocellulose substrates is less clear. We added graphene to a carbonized nanolignocellulose to change its mechanical and electromechanical properties. Here, the laminated carbonized nanolignocellulose/graphene composites were fabricated by carbonizing the nanolignocellulose/graphene composites prepared through mechanochemistry and flow-directed assembly process. The resulting composites exhibit excellent mechanical property with the ultimate bending strength of 25.6 ± 4.2 MPa. It is observed reversible electrical resistance change in these composites with strain, which is associated with the tunneling conduction model. This type of high-strength conductive composite has great potential applications in load-bearing electromechanical sensors.

Processing Lignocellulose-Based Composites into an Ultrastrong Structural Material

“…Figure a and Figure S8b show that the crack in the brushite/DNLC composites spreads along a winding track. This crack deflection accompanied by interface failure is consistent with the crack-extension model (Figure S8a) and the toughening mechanism of most layered materials. − In contrast, the crack straightly extends in the lignocellulose bulk specimen (Figure S8c). This result proves it is feasible for us to design a multiscale layered structure to increase the toughness of the brushite/DNLC composites, and it is well consistent with the data in Table S1.…”

“…Apparently, the brushite/DNLC composites exhibit a better flexural strength and flexural modules than those of lignocellulose-based composites. The strength is 1.8–4.4 times higher than those of modified lignocellulosic materials without inorganic and organic filler (black squares). ,, The modules are 1.7–5.7 times higher than that of lignocellulosic materials with polymer and unenvironmentally friendly adhesive (half-filled red circle). − The integrated mechanical performance is far superior to those of the layered binary and ternary composites based on NLC (blue triangle). ,, − The cooperative work between brushite platelets and DNLC is accountable for increasing strength and modules. Inversely, covalent or ionic cross-linking is liable to increase strength but increase the limit of mutual movement of lignocellulose in deformation.…”

Lightweight and Flexible Phenolic Aerogels with Three-Dimensional Foam Reinforcement for Acoustic and Thermal Insulation

“…The preparation of aerogel composites with reinforcements can greatly decrease the volume shrinkage during the drying, as well as improve the mechanical properties, which is one of the most effective techniques to broaden the aerogel applications . Different reinforcement materials, such as graphene, carbon nanotubes, carbon fibers, ceramic fibers, and natural fibers, have been employed. The type of reinforcements and their inherent properties such as strength, bulk density, and size along with the content of reinforcement impact the final mechanical and insulation properties of aerogel composites .…”

Study on the effect of carbon fiber addition on the properties of rice straw-plastic composites

“…Carbon fibers are lightweight, good-sized, high in tensile strength, and have the characteristics of common carbon materials, such as high temperature resistance, friction resistance, electrical conductivity, thermal conductivity, and small expansion coefficient (Chen et al 2018;Dang et al 2018). Carbon fiber composites are commonly prepared by mixing carbon fiber with resin, metal, ceramic, or another matrix composite.…”