Superhydrophobic surfaces using selected zinc oxide microrod growth on ink-jetted patterns

Area of Science:

• Materials Science
• Surface Chemistry
• Nanotechnology

Background:

• Zinc oxide (ZnO) is typically hydrophilic.
• Creating hydrophobic surfaces often requires chemical modification.
• Artificial roughness is key to achieving superhydrophobicity.

Purpose of the Study:

• To synthesize and characterize superhydrophobic surfaces using ZnO microrod-decorated micropatterns.
• To explore the creation of hydrophobic surfaces via microstructuring without chemical alteration.
• To investigate the relationship between surface topography and water contact angle.

Main Methods:

• Fabrication of micron-scale patterns with ZnO seed particles on glass substrates using a modified inkjet printer.
• Hydrothermal growth of ZnO microrods on the patterned seeds.
• Measurement of water contact angle (WCA) using sessile droplet analysis.

Main Results:

• Superhydrophobic surfaces with a maximum water contact angle of 153° were successfully synthesized.
• The binary surface topography of ZnO microrods on micropatterns effectively induced superhydrophobicity.
• Different micro array patterns exhibited varying static contact angle responses.

Conclusions:

• Binary surface topography, specifically ZnO microrod-decorated micropatterns, is an effective strategy for creating superhydrophobic surfaces.
• Hydrothermal growth provides a viable method for fabricating these surfaces without additional chemical treatments.
• The developed surfaces show potential for applications requiring water repellency.