Abstract: Interface phenomena and their related applications are prevalent in everyday life. This experiment, based on the theoretical principles of solid-liquid interface wetting and the relationship between material chemical structure and interface wetting, provides a visual demonstration of surface wetting phenomena and the applications of hydrophilic and hydrophobic coatings. To emphasize the core concepts of beautiful chemistry and green chemistry, two engaging and visually appealing experiments—“Invisible Pattern Display” and “Oil-Water Separation”—were independently designed. These experiments effectively illustrate the characterization and practical applications of hydrophilic and hydrophobic surfaces. The method used is simple, safe, and highly visual, combining scientific and artistic elements. It allows participants to closely experience the preparation of hydrophilic and hydrophobic surfaces, enhancing their practical skills and stimulating interest in chemistry and new materials and technologies.

Key words: Hydrophilic/hydrophobic coatings, Surface modification, Wetting phenomenon, Oil-water separation, Beauty of chemistry