Diving-floating locomotion induced by capturing and manipulating bubbles in an aqueous environment

Area of Science:

• Materials Science
• Surface Chemistry
• Robotics

Background:

• Superhydrophobic and superaerophilic surfaces are of interest for manipulating fluid interfaces.
• Controlling buoyancy and locomotion in aqueous environments is a key challenge in micro-robotics and material science.

Purpose of the Study:

• To fabricate a novel superaerophilic surface using silica nanoparticle/PDMS composites.
• To investigate the adhesion properties of air bubbles on the fabricated surface.
• To demonstrate the application of this surface for inducing controllable locomotion in an aqueous environment.

Main Methods:

• Facile self-assembly of silica nanoparticle/PDMS composites to create the superaerophilic surface.
• Characterization of surface properties and bubble adhesion in an aqueous medium.
• Demonstration of adjustable system density via adhered air bubbles for locomotion control.

Main Results:

• The fabricated surface exhibited superaerophilic properties with strong adhesion to air bubbles.
• The adhesion of air bubbles allowed for tunable overall density of the system.
• This tunable density was successfully utilized to achieve diving-floating locomotion.

Conclusions:

• A facile method for fabricating superaerophilic surfaces was developed.
• The superaerophilic surface effectively controls air bubble adhesion, enabling adjustable buoyancy.
• This approach offers a novel strategy for designing self-propelled or remotely controlled aquatic devices.