Recent progress in experiments for sessile droplet wetting on structured surfaces Junheng Ren and Fei Duan

Wetting of a sessile droplet on structured or patterned surface can be found in a broad range of applications. The researchers have been promoted to keep working on the topic. The review is on the basis of the recent experimental advances on the sessile droplet wetting on the hydrophobic, hydrophilic, or combined hydrophobic and hydrophilic surfaces under isothermal conditions, and on heating or cooling substrates having nonisothermal conditions. More attention has been paid on the wetting configuration between the sessile droplet and the structured substrate; the research gap has been discussed on identifying the three-phase line shape. Further, the three-dimensional measurement for the sessile droplets on the patterned surfaces with focusing more on the contact line of sessile droplets might reveal new physical insights. This review targets at building a holistic overview on the sessile droplet wetting behaviors on the structured substrate in the past 2 years.

Automated summary

The review focuses on sessile droplet wetting behaviors on structured substrates, covering recent experimental advances in wetting on hydrophobic, hydrophilic, or combined hydrophobic and hydrophilic surfaces. Attention is given to the wetting configuration and three-phase line shape identification, with potential for new physical insights through three-dimensional measurements on patterned surfaces.