Understanding ultrafast free-rising bubble capturing on nano/micro-structured super-aerophilic surfaces.

Area of Science:

• Surface science
• Fluid dynamics
• Materials science

Background:

• Nanostructures on super-aerophilic surfaces are known to aid bubble capture.
• The role of microtextures in bubble capture, especially pre-contact, remains poorly understood.

Purpose of the Study:

• To investigate the contribution of microtextures in promoting initial bubble capture.
• To understand the mechanism of ultrafast bubble capture induced by microstructured surfaces.

Main Methods:

• Utilizing an array of microcones decorated with nanoparticles to create super-aerophilic surfaces.
• Analyzing the large deformation of entrapped gas layers induced by rising bubbles.
• Investigating liquid film thinning dynamics leading to rupture.

Main Results:

• Achieved ultrafast bubble capture (approximately 1 millisecond) via microtexture-induced gas layer deformation.
• Demonstrated stable capture due to three-phase contact line hysteresis, establishing a critical pressure criterion.
• Showcased prolonged, loss-free gas transport in challenging shear flow conditions.

Conclusions:

• Microtextures play a crucial role in ultrafast bubble capture, even before direct bubble contact.
• The developed nano/microstructured surfaces offer robust strategies for bubble control in various systems.
• This research advances understanding and application of bubble manipulation in aquatic environments.