How was superhydrophilicity discovered?

Superhydrophilicity refers to the high surface energy of a material, which enhances its affinity with water or other polar liquids. On this surface, water droplets are almost unable to slide, but can tightly adhere to the surface. Super hydrophilic materials have advantages in self-cleaning surfaces, preventing water evaporation, and reducing water stains, such as kitchen and bathroom products, building materials, and electronic products. one

The term “proximity” in the definition of superhydrophilicity is not a quantifiable indicator, as there is currently limited research on superhydrophilicity and no clear and recognized definition. Super hydrophilicity was first proposed by renowned Japanese photochemician and foreign academician of the Chinese Academy of Engineering, Akira Fujishima. When studying the photocatalytic effect, he found that under ultraviolet light irradiation, the water droplets on the surface of titanium dioxide will be completely spread out, and the contact angle is close to 0, far less than its initial angle. In order to distinguish it from conventional hydrophilic materials, he proposed the concept of superhydrophilicity and further applied it to self-cleaning coatings. two

A method for preparing super hydrophilic surface — sol gel method is to dissolve alkoxy metal or metal alkoxide and other precursors in solvent, and under certain conditions, chemical reactions such as hydrolysis and polycondensation occur to form sol. Sol particles continue to grow and cross link with each other to form gel with three-dimensional network structure. Porous materials can be obtained after solvent in gel volatilizes

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