High Value Utilization of Waste Wood toward Porous and Lightweight Carbon Monolith with EMI Shielding, Heat Insulation and Mechanical Properties

Abstract

With the increasing pollution of electromagnetic (EM) radiation, it is necessary to develop low-cost, renewable electromagnetic interference (EMI) shielding materials. Herein, wood-derived carbon (WC) materials for EMI shielding are prepared by one-step carbonization of renewable wood. With the increase in carbonization temperature, the conductivity and EMI performance of WC increase gradually. At the same carbonization temperature, the denser WC has better conductivity and higher EMI performance. In addition, due to the layered superimposed conductive channel structure, the WC in the vertical-section shows better EMI shielding performance than that in the cross-section. After excluding the influence of thickness and density, the specific EMI shielding effectiveness (SSE/t) value can be calculated to further optimize tree species. We further discuss the mechanism of the influence of the microstructure of WC on its EMI shielding properties. In addition, the lightweight WC EMI material also has good hydrophobicity and heat insulation properties, as well as good mechanical properties.

Recent developments in sustainable EM wave shielding composites- review

“…This was attributed to evenly distributed Cu on the surface of the fiber. Ma et al [62] developed 2 mm carbonized wood-derived carbon (WC) composites using bass, balsa, and beech of three different densities at 600 °C, 800 °C, and 1000 °C. They reported that increasing the carbonization temperature has increased the conductivity of the samples and hence increased the SE.…”

Porous Cu-BTC Metal–Organic Frameworks Anchored on Dialdehyde Wood Sponge as Material for CO2 Capture and Separation

“…Notably, the interconnections between its cell walls form a unique porous structure, and the abundant hydroxyl groups serve as active sites conducive to chemical modification, creating favorable conditions for MOF growth . Most of the wood-based composite strategies involve alkali treatment with NaOH solution and TEMPO carboxylation of the matrix to enable in situ growth of MOFs within it or physically mixing both components for direct processing into a usable form. , Nevertheless, these composite synthesis methods suffer from low affinity between MOFs and the substrate, and the high hydroxyl group content in the matrix makes the desorption process challenging. − Moreover, the use of some toxic chemical reagents restricts their practical application in CO 2 capture. Herein, we propose an environmentally benign method to oxidize the hydroxyl groups in wood sponge (WS) to enhance the binding strength with MOFs, resulting in a dialdehyde WS (DWS).…”