Fabrication of Superhydrophobic Surfaces from Femtosecond Laser Patterned Surfaces

Drag reduction on laser-patterned hierarchical superhydrophobic surfaces.

Hierarchical laser-patterned surfaces were tested for their drag reduction abilities. A tertiary level of surface roughness which supports stable Cassie wetting was achieved on the patterned copper samples by laser-scanning multiple times. The laser-fabricated micro/nano structures sustained the shear stress in liquid flow. A rheometer setup was used to measure the drag reduction abilities in t...

Femtosecond laser induced hierarchical ZnO superhydrophobic surfaces with switchable wettability.

A simple and one-step method to form a rough ZnO layer consisting of micro/nanoscale hierarchical structures via direct femtosecond laser ablation of the Zn surface is reported for the first time. The resultant surfaces show switchable wettability between superhydrophobicity and quasi-superhydrophilicity via alternate UV irradiation and dark storage.

Towards optimization of patterned superhydrophobic surfaces.

Experimental and theoretical study of wetting properties of patterned Si surfaces with cylindrical flat-top pillars of various sizes and pitch distances is presented. The values of the contact angle (CA), contact angle hysteresis (CAH) and tilt angle (TA) are measured and compared with the theoretical values. Transition from the composite solid-liquid-air to the homogeneous solid-liquid interfa...

Sliding droplets on hydrophilic/superhydrophobic patterned surfaces for liquid deposition

Femtosecond laser controlled wettability of solid surfaces.

Femtosecond laser microfabrication is emerging as a hot tool for controlling the wettability of solid surfaces. This paper introduces four typical aspects of femtosecond laser induced special wettability: superhydrophobicity, underwater superoleophobicity, anisotropic wettability, and smart wettability. The static properties are characterized by the contact angle measurement, while the dynamic ...