Chen Feng, Xi'an Jiaotong University team based on femtosecond laser micro-machining technology to obtain the underwater transparent super-oleophobic interface. The research was published in the cover article in the journal J. Mater. Chem. A [3, 9379-9384 (2015)] and was published by Chemistry World under the title "Fish and Flowers Inspire Diving Goggle Material ".
The study was inspired by the unique functional surface characteristics of fish scales and lotus leaves. Fish scales will not be contaminated by oil under the water, while the mountain lotus leaf will be white from the rain into a transparent. The research team used femtosecond laser to induce a layer of nanoparticle structure on the surface of quartz glass. When the structured surface is immersed in water, the water will fill in between the coarse nano-structures to form a trapped water layer, which can effectively hinder the contact of the oil droplets with the solid surface, so that the prepared surface possesses underwater super-oleophobicity, That is, anti-oil properties. At the same time, the laser-induced roughness of the rough surface greatly diminishes the light scattering due to the refractive index of the trapped water layer being closer to the refractive index of quartz glass than the air, and the transmittance under water will exceed 90%. This underwater transparent oil resistant surface is expected to gain important applications in underwater smart vehicle optical windows and biological liquid environment transmission imaging.
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