Abstract
The combination of nano-metal and wood to prepare copper-coated wood-based composite materials has important research value and practical significance for improving the function of wood, expanding the application field of wood, and adding added value. In this paper, 31-year-old wood (Pinus sylvestris L. var. mongholica Litv) veneer was taken as the research object. The wood veneer was pretreated by ultrasonic wave, and copper film was deposited on the surface of the wood veneer by magnetron sputtering to prepare “environmentally friendly” copper-plated wood-based composite materials. The microstructure and hydrophobic properties of Cu-coated wood-based composites were characterized and studied. With the increase in coating time, the diffraction peak intensity of wood cellulose gradually decreased, and the diffraction peaks of Cu (111), Cu (200), and Cu (220) of metallic copper appeared. Under the sputtering condition of a substrate temperature of 200 °C, the copper film deposit on the surface of the wood was uniform and densely arranged. The surface water contact angle reached 149.9°. Ultrasonic treatment increases the porous structure of wood, and the rough metal copper film interface was constructed on the surface of wood by magnetron sputtering to transform the surface wettability of the wood from hydrophilic to super-hydrophobic. The lotus leaf effect was realized on the wood surface.
Highlights
Litv) veneer without any chemical treatment was used as the substrate, and the copper film was deposited on the surface of the ultrasonic pretreated wood veneer by magnetron sputtering to prepare
It could be seen from the XRD pattern that, after the ultrasonic treatment of the wood veneer, there are still characteristic peaks of three crystal faces (101, 002, and 040) of cellulose in the wood at 2θ, equal to 17.0◦, 22.3◦, and 35.0◦
The Pinus sylvestris L. var. mongholica Litv veneers were used as the substrate, and the copper film was deposited on the surface of the ultrasonic pretreated wood veneer by magnetron sputtering to prepare the “environmentally friendly” copper-coated wood-based composite materials
Summary
Its main components are cellulose, hemicellulose, and lignin. The three major polymer materials (lignin, cellulose, and hemicellulose) are mutually interlaced, and a skeleton structure with porous channels is formed [1]. Cellulose and hemicellulose are carbohydrates, and lignin is a phenolic substance, all of which contain a large number of hydroxyl groups. The conversion of wood from hydrophilic to hydrophobic is always associated with the covering, modification, or removal of hydroxyl groups. The porous structure of the surface of the wood and the existence of a large amount of hydroxyl groups can provide nucleation and film-forming substrates for inorganic nano particles and provide the necessary conditions for the formation of hydrophobic film on the surface of wood [1].
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