ENGINEERING TECHNOLOGY

Bamboo “transforms” into a new type of high-light transmission electromagnetic shielding material


A new type of high-light transmission electromagnetic shielding material converted from raw bamboo. Photo courtesy of Nanjing Lin Da

Recently, the research group led by Wu Yan, professor of the green home materials manufacturing team of the School of Home and Industrial Design of Nanjing Forestry University, transformed it into a cellulose composite material with good optical properties on the basis of retaining the natural shape of raw bamboo and the cellulose skeleton structure through a simple and efficient treatment method. Recently, the research results were published in the international journal Nano-Micro Letters.

Bamboo is a common biomass material that is widely used in the field of furniture and home decoration materials. With the increasing demand for personalized decoration of the home environment, more and more research has been carried out on the conversion of environmentally friendly materials such as wood and bamboo into new materials, but few studies have attempted to directly process raw bamboo into cellulose composites with ideal optical properties for use.

The team first used a simple chemical pretreatment to remove lignin from the original bamboo, and its removal meant the disappearance of the “binder” (connecting cellulose and hemicellulose), resulting in the appearance of more porosity, favoring resin filling with a refractive index that matched the bamboo cellulose template. After the rapid curing process, a new transparent bamboo material with excellent optical transmission performance, tensile resistance, surface decoration and aesthetic value was born.

Studies have confirmed that the light-transmitting original bamboo and transparent bamboo sheet and electromagnetic shielding film form a composite device, and the overall structure is similar to that of common honeycomb panels. Among them, the light-transmitting raw bamboo serves as the core skeleton, the transparent bamboo sheet is the panel, and the tin doped indium oxide film is the functional layer. This composite device can exhibit significant thermal insulation, thermal insulation performance and electromagnetic shielding performance, and has broad prospects in the field of home and building decoration materials.

This method of directly processing raw bamboo into cellulose template and then synthesizing light-transmitting materials will greatly reduce the steps of early raw material machining and later raw material molding, which not only reduces energy consumption, but also reduces the waste of petrochemical resources. At the same time, the research method can also be extended to other high-density, low-porosity biomass materials.

Nanjing Forestry University is the first completion unit of the paper, graduate student Wang Jing is the first author, and Wu Yan is the first corresponding author. The results were supported by the National Natural Science Foundation of China and the “Blue Project” of Jiangsu Province. (Source: China Science News, Li Chen, Fang Yanyu, Yao Huichun)

Related paper information:https://doi.org/10.1007/s40820-022-00982-7



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