Dip-coating deposition on chemically patterned surfaces: a mechanistic analysis and comparison with topographically...

Area of Science:

• Materials Science
• Surface Chemistry
• Nanotechnology

Background:

• Chemically patterned surfaces with hydrophilic/hydrophobic regions facilitate particle deposition via dip-coating.
• Superhydrophobic surfaces with topographic features (posts) offer an alternative for dip-coating deposition.

Purpose of the Study:

• To compare dip-coating deposition using chemically patterned surfaces versus post-containing superhydrophobic surfaces.
• To analyze the distinct mechanisms of capillary bridge failure and solvent evaporation in both approaches.

Main Methods:

• Dip-coating deposition on chemically patterned and post-containing superhydrophobic surfaces.
• Analysis of receding three-phase contact line events.
• Investigation of solvent evaporation stages and contact angles.

Main Results:

• Chemically patterned surfaces exhibit sessile capillary bridge failure, while post-containing superhydrophobic surfaces show tensile failure.
• Solvent evaporation dynamics differ significantly, influenced by receding contact angles.
• Controlling solvent partial pressure is identified as a key variable for optimizing deposition on chemically patterned surfaces.

Conclusions:

• Significant differences exist in dip-coating deposition mechanisms between chemically patterned and superhydrophobic surfaces.
• Understanding capillary bridge failure and evaporation is crucial for controlling particle array formation.
• Chemically patterned surfaces offer tunable control over deposition processes through evaporation rate manipulation.