Super-Hydrophobic Tungsten Trioxide with Special Wettability

Nowadays, research on the wettability of tungsten trioxide materials is not deep enough, although thanks to its unique optoelectronic properties, WO3 has been used in many fields such as photochromism, photocatalysis, electrochromism, sensors and information storage. These areas are also well-known applications of WO3, as many people know that tungsten trioxide is a common n-type semiconductor material. However, the lack of research on the wettability of WO3 will undoubtedly greatly limit the application of tungsten trioxide materials in practical industries. Therefore, the combination of tungsten trioxide material and wetting properties will have important theoretical and practical significance in the increasingly mature and application of WO3 preparation methods.

In recent years, special wettability materials have received great attention from researchers at home and abroad, and of course, thanks to their unique properties and broad application prospects. In contact with this material, you may want to know what determines the wettability of the surface of the material. There are many possible factors, but the two main factors are free energy and roughness. By changing these two factors, you can get a range of different special wettability surfaces.

How to provide some new design ideas and methods for the study of tungsten trioxide (WO₃) materials as new functional materials? Nature is through related experiments. First, WO3 materials with different morphologies were prepared on different substrates by simple hydrothermal method and acid precipitation method. Then, using surface modification to control its wetting properties, several WO3 materials with special wettability were prepared to explore their inherent laws and potential applications. The main research contents are as follows:

1) The WO3 film with different morphology was prepared on a 400 mesh stainless steel mesh substrate by a simple hydrothermal process. The microstructure and surface composition of the sample surface were analyzed by SEM, XRD and XPS. The results show that: Different pH has a great influence on the microscopic morphology and composition of the sample surface.

In addition, the underwater oil wetting properties of WO3 film were briefly studied by contact angle measuring instrument. The results show that: The obtained WO3 films all have good underwater oleophobicity. This provides a new design idea for the preparation of special wettable WO3 surfaces with different morphologies.

2) On the basis of the previous experiment, the WO3 film with underwater super-oleophobicity was prepared on a 2300 mesh stainless steel mesh by changing certain hydrothermal conditions. The surface morphology of WO3 film samples was analyzed by SEM. The results show that: A rough structure appeared on the smooth stainless steel mesh after the water heat.

Subsequently, the surface crystal structure of the sample was analyzed by XRD, and the results showed that: The surface composition of the sample was hexagonal phase WO3.

Further, the obtained WO3 film was separately separated from the layered oil-water mixture and the oil-in-water emulsion by a simple separating device, and the separation efficiency was calculated by the formula. Finally, the microscopic morphology of the oil-in-water emulsion before and after separation was tested by optical microscopy to provide a new solution to solve the oil pollution problem.

3) Super-hydrophobic WO3 micron particles were obtained by simple acid precipitation and octadecyltrichlorosilane modification, and coated on glass sheets with epoxy resin to obtain superhydrophobic coating with photochromism and mechanical stability. Floor. The surface morphology and surface composition of the coating were analyzed by SEM, XRD, XPS and FTIR. The results show that: The surface of the coating is covered with a coarse structure consisting of WO3 particles.

Subsequently, the UV resistance and mechanical stability of the coating were tested by an ultraviolet light test and a scratch test. In addition, the self-cleaning properties of the coating were also investigated by an anti-sticking test and a ash layer removal test.

Finally, the resulting coating was coated on a different substrate and tested for suitability. This provides some basis for the successful preparation of superhydrophobic coatings with stable properties.

It is well known that wettability is extremely important for any type of material surface. Due to its unique properties and potential application value, it is constantly attracting people's interest.

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