Zhaoxiang Yang,Yonglin He,Shenglong Liao,Yingchao Ma,Xinglei Tao,Yapei Wang
Hydrogel coatings pave an avenue for improving the lubricity, biocompatibility, and flexibility of solid surfaces. From the viewpoint of practical applications, this work establishes a scalable method to firmly adhere hydrogel layers to diverse solid surfaces. The strategy, termed as renatured hydrogel painting (RHP), refers to adhering dehydrated xerogel to a surface with appropriate glues, followed by the formation of a hydrogel layer after rehydration of the xerogel. With the benefits of simplicity and generality, this strategy can be readily applied to different hydrogel systems, no matter what the substrate is. Hydrogel adhesion is demonstrated by its tolerance against mechanical impact with hydrodynamic shearing at 14 m/s. This method affords powerful supplements to renew the surface chemistry and physical properties of solid substrates. In addition, we show that the RHP technique can be applied to living tissue, with potential for clinical applications such as the protection of bone tissue.
The electrochemical desulfurization in the molten salt is a promising green route to extract metals directly from sulfide ores. However, less attention has been paid to the process of converting solid sulfides to liquid metals, especially the evolution of the solid sulfide/liquid metal interface. Herein, the electrochemical desulfurization process of converting solid ZnS to liquid Zn in NaCl-KCl was studied through electrochemical measurements, wettability test, and postmortem analysis of the electrolytic product. The continuous solid-to-liquid reaction in the molten salt is ascribed to the poor wettability of liquid Zn on the solid ZnS which prevents the liquid Zn from fully covering the sulfide surface and allows S 2- ions transfer. The desulfurization process consisted of three stages: two-step reduction of zinc sulfide and the reduction of Na + on the liquid Zn to form Na-Zn alloys. The understanding of the solid-to-liquid conversion process is helpful to understand various solid-to-liquid reactions so as to design efficient electrolyzers.
危险品化学品经营许可证（带存储）