Bioinspired steel surfaces with extreme wettability contrast

Area of Science:

• Materials Science
• Surface Chemistry
• Biomimetics

Background:

• Natural organisms utilize surface wettability for functions like water harvesting and liquid repulsion.
• Hierarchical micro/nanostructures and surface energy control are key to natural wettability phenomena.

Purpose of the Study:

• To develop a method for creating tunable wettability contrast on alloy steels.
• To mimic natural structures for controlled liquid alignment and potential water harvesting.

Main Methods:

• Creating hierarchical micro/nanostructures of Fe oxides on steel via fluorination and catalytic reactions.
• Applying hydrophobic coatings and selective plasma oxidation to achieve superhydrophobic and superhydrophilic regions.
• Investigating liquid water alignment during condensation on engineered surfaces.

Main Results:

• Successfully fabricated alloy steel surfaces with distinct superhydrophilic and superhydrophobic regions.
• Demonstrated the alignment of liquid water within hydrophilic areas on the patterned surfaces.
• Showcased the potential for controlling other liquids and biological cells.

Conclusions:

• The developed method provides a pathway for engineering wettability contrast on steel surfaces.
• This technique offers potential applications in water harvesting, microfluidics, and cell alignment.
• The biomimetic approach highlights the efficiency of natural designs for material functionalities.