Abstract
Due to the presence of unique micro/nanostructures on the surface, fish’s scale exhibits underwater superoleophobicity and keeps clean even in oil-polluted water. Inspired from this, we propose a facile method for the fabrication of underwater superoleophobic and anti-oil sapphire surface with line-patterned nanostructures by femtosecond laser. The as-prepared surface shows great superoleophobicity that the oil contact angles can reach up to 153° for 1, 2-dichloroethane droplets in water and low oil-adhesion. At the same time, the relationship between the microgrooves’ period and surface wettability is studied, and the results indicate that the underwater superoleophobicity and low oil-adhesion can be achieved using a wide range of processing parameters. Meanwhile, the obtained surface is demonstrated to exhibit excellent stability. Moreover, the self-cleaning anti-oil ability of the as-prepared surface is conducted, and the potential mechanism of which is discussed. This technique has potential applications for the fabrication of underwater oil repelling devices and microfluidics.
Highlights
Superhydrophobic surface is characterized by the water contact angle (WCA) larger than 150◦, which is initially observed in natural materials.[9,10]
We present a simple approach for the fabrication of underwater superoleophobic and anti-oil surface using femtosecond laser direct writing technology, the fabricated surface shows good superoleophobicity that the oil contact angles can reach up to 153◦ for 1, 2-dichloroethane droplets in water
It is demonstrated that the underwater superoleophobicity and low oil-adhesion can be obtained by a wide variation of periods and the fabricated surfaces possess good stability, including the long term stability, the mechanical durability, and scalability
Summary
Being as a very important property of solid surfaces, wettability has attracted considerable attentions from the theoretical studies and experimental researches, mainly triggered by addressing the problem related to energy, environment, resource, and health.[1,2,3,4,5,6,7,8] Superhydrophobic surface is characterized by the water contact angle (WCA) larger than 150◦, which is initially observed in natural materials.[9,10] In recent decades, bioinspired surface, such as lotus leaf, with unique wettability have been intensively explored and accelerated by discoveries of wetting phenomena in nature. Femtosecond laser fabrication of robust underwater superoleophobic and anti-oil surface on sapphire We present a simple approach for the fabrication of underwater superoleophobic and anti-oil surface using femtosecond laser direct writing technology, the fabricated surface shows good superoleophobicity that the oil contact angles can reach up to 153◦ for 1, 2-dichloroethane droplets in water.
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